FPCN11 CWTO 181930
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 3:30 p.m. EDT Sunday 18 October 2026 for
tonight Monday and Monday night.
The next scheduled forecast will be issued at 5:00 a.m. EDT Monday.

City of Toronto.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 5.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low 7.

Windsor - Leamington - Essex County.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 30 km/h gusting to 50 becoming light near midnight. Low plus 4.
Monday..Sunny. Fog patches dissipating in the morning. High 19. UV
 index 4 or moderate.
Monday night..Clear. Low plus 4.

Chatham-Kent - Rondeau Park.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 4.
Monday..Sunny. Fog patches dissipating in the morning. High 19. UV
 index 4 or moderate.
Monday night..Clear. Becoming partly cloudy after midnight. Low
 plus 4.

Sarnia - Petrolia - Western Lambton County.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 3.
Monday..Sunny. Fog patches dissipating in the morning. High 19. UV
 index 4 or moderate.
Monday night..Clear. Becoming partly cloudy near midnight. Low
 plus 3.

Watford - Pinery Park - Eastern Lambton County.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 3.
Monday..Sunny. Fog patches dissipating in the morning. High 19. UV
 index 4 or moderate.
Monday night..Clear. Becoming partly cloudy after midnight. Low
 plus 3.

Rodney - Shedden - Western Elgin County.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 30 km/h gusting to 50 becoming light near midnight. Low plus 3.
Monday..Sunny. Fog patches dissipating in the morning. High 18. UV
 index 4 or moderate.
Monday night..Clear. Low plus 3.

St. Thomas - Aylmer - Eastern Elgin County.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 30 km/h gusting to 50 becoming light near midnight. Low plus 3.
Monday..Sunny. Fog patches dissipating in the morning. High 18. UV
 index 4 or moderate.
Monday night..Clear. Low plus 3.

Strathroy - Komoka - Western Middlesex County.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 3.
Monday..Sunny. Fog patches dissipating in the morning. High 18. UV
 index 4 or moderate.
Monday night..Clear. Low plus 3.

London - Parkhill - Eastern Middlesex County.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 3.
Monday..Sunny. Fog patches dissipating in the morning. High 18. UV
 index 4 or moderate.
Monday night..Clear. Low plus 3.

Simcoe - Delhi - Norfolk.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 3.
Monday..Sunny. Fog patches dissipating in the morning. High 17. UV
 index 4 or moderate.
Monday night..Clear. Low plus 3.

Dunnville - Caledonia - Haldimand.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 30 km/h gusting to 50 becoming light near midnight. Low plus 4.
Monday..Sunny. Fog patches dissipating in the morning. High 18. UV
 index 4 or moderate.
Monday night..Clear. Becoming partly cloudy after midnight. Low
 plus 4.

Woodstock - Tillsonburg - Oxford County.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 3.
Monday..Sunny. Fog patches dissipating in the morning. High 18. UV
 index 4 or moderate.
Monday night..Clear. Low plus 3.

Brantford - County of Brant.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 3.
Monday..Sunny. Fog patches dissipating in the morning. High 18. UV
 index 4 or moderate.
Monday night..Clear. Low plus 3.

Niagara Falls - Welland - Southern Niagara Region.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 30 km/h gusting to 50 becoming light near midnight. Low plus 5.
Monday..Sunny. Fog patches dissipating in the morning. High 17. UV
 index 4 or moderate.
Monday night..Clear. Becoming partly cloudy after midnight. Low 6
 with temperature rising to 11 by morning.

St. Catharines - Grimsby - Northern Niagara Region.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 5.
Monday..Sunny. Fog patches dissipating in the morning. High 18. UV
 index 4 or moderate.
Monday night..Clear. Becoming partly cloudy after midnight. Low 6.

City of Hamilton.
Tonight..Clear. Fog patches developing overnight. Wind southwest
 20 km/h gusting to 40 becoming light near midnight. Low plus 4.
Monday..Sunny. Fog patches dissipating in the morning. High 18. UV
 index 4 or moderate.
Monday night..Clear. Becoming partly cloudy after midnight. Low 6.

Burlington - Oakville.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 5.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 5.

Halton Hills - Milton.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..A few clouds. Low plus 5.

Mississauga - Brampton.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 5.
Monday..Sunny. High 19. UV index 4 or moderate.
Monday night..A few clouds. Low plus 5.

Caledon.
Tonight..Clear. Wind southwest 20 km/h gusting to 40. Low plus 4.
Monday..Sunny. Wind southwest 20 km/h becoming light near noon.
 High 18. UV index 4 or moderate.
Monday night..Clear. Becoming partly cloudy in the evening. Low
 plus 5.

Vaughan - Richmond Hill - Markham.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 5.

Newmarket - Georgina - Northern York Region.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..A few clouds. Low plus 3.

Pickering - Oshawa - Southern Durham Region.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 3.

Uxbridge - Beaverton - Northern Durham Region.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 3.

Goderich - Bluewater - Southern Huron County.
Tonight..Clear. Wind southwest 30 km/h gusting to 50. Low plus 5.
Monday..Mainly sunny. Wind becoming southwest 20 km/h in the morning.
 High 16. UV index 4 or moderate.
Monday night..Clear. Becoming partly cloudy late in the evening. Low
 plus 2.

Wingham - Blyth - Northern Huron County.
Tonight..Clear. Wind southwest 30 km/h gusting to 50. Low plus 5.
Monday..Mainly sunny. Wind becoming southwest 20 km/h in the morning.
 High 16. UV index 4 or moderate.
Monday night..Clear. Becoming partly cloudy late in the evening. Low
 plus 2.

Stratford - Mitchell - Southern Perth County.
Tonight..Clear. Wind southwest 30 km/h gusting to 50 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 16. UV index 4 or moderate.
Monday night..Clear. Low plus 2.

Listowel - Milverton - Northern Perth County.
Tonight..Clear. Wind southwest 30 km/h gusting to 50 becoming light
 near midnight. Low plus 3.
Monday..Mainly sunny. High 16. UV index 4 or moderate.
Monday night..Clear. Becoming partly cloudy near midnight. Low
 plus 2.

Kitchener - Cambridge - Region of Waterloo.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 17. UV index 4 or moderate.
Monday night..Clear. Low plus 3.

Guelph - Erin - Southern Wellington County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 17. UV index 4 or moderate.
Monday night..Clear. Low plus 3.

Mount Forest - Arthur - Northern Wellington County.
Tonight..Clear. Wind southwest 30 km/h gusting to 50. Low plus 4.
Monday..Mainly sunny. Wind southwest 20 km/h becoming light near
 noon. High 17. UV index 4 or moderate.
Monday night..Clear. Becoming partly cloudy near midnight. Low
 plus 3.

Orangeville - Grand Valley - Southern Dufferin County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40. Low plus 4.
Monday..Sunny. Wind southwest 20 km/h becoming light near noon.
 High 17. UV index 4 or moderate.
Monday night..Clear. Becoming partly cloudy in the evening. Low
 plus 1.

Shelburne - Mansfield - Northern Dufferin County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40. Low plus 4.
Monday..Sunny. Wind southwest 20 km/h becoming light near noon.
 High 17. UV index 4 or moderate.
Monday night..Clear. Becoming partly cloudy in the evening. Low
 plus 1.

Innisfil - New Tecumseth - Angus.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Sunny. High 17. UV index 4 or moderate.
Monday night..A few clouds. Low plus 1.

Saugeen Shores - Kincardine - Southern Bruce County.
Tonight..Clear. Wind southwest 30 km/h gusting to 50. Low plus 5.
Monday..A mix of sun and cloud. Wind becoming southwest 20 km/h in
 the morning. High 15. UV index 4 or moderate.
Monday night..Increasing cloudiness in the evening. Low plus 3.

Bruce Peninsula - Sauble Beach - Tobermory.
Tonight..Clear. Wind southwest 30 km/h gusting to 50. Low 8.
Monday..A mix of sun and cloud. Wind southwest 20 km/h. High 15. UV
 index 4 or moderate.
Monday night..Clear. Low plus 3.

Hanover - Dundalk - Southern Grey County.
Tonight..Clear. Wind southwest 30 km/h gusting to 50. Low plus 4.
Monday..A mix of sun and cloud. Wind southwest 20 km/h becoming light
 near noon. High 16. UV index 4 or moderate.
Monday night..Clear. Becoming partly cloudy in the evening. Low
 plus 3.

Owen Sound - Blue Mountains - Northern Grey County.
Tonight..Clear. Wind southwest 30 km/h gusting to 50. Low plus 4.
Monday..A mix of sun and cloud. Wind southwest 20 km/h becoming light
 near noon. High 15. UV index 3 or moderate.
Monday night..A few clouds. Low plus 5.

Barrie - Collingwood - Hillsdale.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Sunny. High 16. UV index 4 or moderate.
Monday night..A few clouds. Low plus 3.

Midland - Coldwater - Orr Lake.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Sunny. Becoming a mix of sun and cloud in the morning.
 High 16. UV index 4 or moderate.
Monday night..A few clouds. Low plus 5.

Orillia - Lagoon City - Washago.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Sunny. High 16. UV index 4 or moderate.
Monday night..Clear. Low plus 5.

Cobourg - Colborne - Western Northumberland County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40. Low plus 4.
Monday..Sunny. Wind southwest 20 km/h becoming light in the
 afternoon. High 17. UV index 4 or moderate.
Monday night..Clear. Low 6.

Belleville - Quinte West - Eastern Northumberland County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40. Low plus 4.
Monday..Sunny. Wind southwest 20 km/h becoming light in the
 afternoon. High 17. UV index 4 or moderate.
Monday night..Clear. Low 6.

Picton - Sandbanks Park.
Tonight..Clear. Wind southwest 20 km/h gusting to 40. Low plus 4.
Monday..Sunny. Wind southwest 20 km/h becoming light in the
 afternoon. High 17. UV index 4 or moderate.
Monday night..Clear. Low 6.

Napanee - Consecon.
Tonight..Clear. Wind southwest 20 km/h gusting to 40. Low plus 4.
Monday..Sunny. Wind southwest 20 km/h becoming light in the
 afternoon. High 17. UV index 4 or moderate.
Monday night..Clear. Low 6.

Kingston - Odessa - Frontenac Islands.
Tonight..Clear. Wind southwest 20 km/h gusting to 40. Low plus 4.
Monday..Mainly sunny. Wind southwest 20 km/h becoming light in the
 afternoon. High 17. UV index 4 or moderate.
Monday night..Clear. Low 6.

Lindsay - Southern Kawartha Lakes.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 3.

Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 15. UV index 4 or moderate.
Monday night..Clear. Low plus 3.

Peterborough City - Lakefield - Southern Peterborough County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 3.

Apsley - Woodview - Northern Peterborough County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Mainly sunny. High 16. UV index 4 or moderate.
Monday night..Clear. Low plus 3.

Stirling - Tweed - Madoc.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 16. UV index 4 or moderate.
Monday night..Clear. Low plus 5.

Tamworth - Sydenham - South Frontenac.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 16. UV index 4 or moderate.
Monday night..Clear. Low plus 5.

Kaladar - Bannockburn - Bon Echo Park.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 16. UV index 4 or moderate.
Monday night..Clear. Low plus 1.

Bancroft - Hastings Highlands - Denbigh.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 2.
Monday..A mix of sun and cloud. High 16. UV index 4 or moderate.
Monday night..Clear. Low plus 1.

Gananoque - Mallorytown.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Mainly sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 4.

Brockville - Prescott.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Mainly sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 4.

Westport - Charleston Lake.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 4.

Merrickville-Wolford - Kemptville.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 18. UV index 4 or moderate.
Monday night..Clear. Low plus 4.

Ottawa North - Kanata - Orl�ans.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 17. UV index 3 or moderate.
Monday night..Clear. Low plus 3.

Ottawa South - Richmond - Metcalfe.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 17. UV index 3 or moderate.
Monday night..Clear. Low plus 3.

Gatineau.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 18. UV index 3 or moderate.
Monday night..Clear. Low plus 4.

Prescott and Russell.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 17. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

Morrisburg - Long Sault.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 17. UV index 4 or moderate.
Monday night..Clear. Low plus 2.

Cornwall - Lancaster.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 17. UV index 4 or moderate.
Monday night..Clear. Low plus 2.

Winchester - Newington.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 17. UV index 4 or moderate.
Monday night..Clear. Low plus 2.

Maxville - Alexandria.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 3.
Monday..Sunny. High 17. UV index 4 or moderate.
Monday night..Clear. Low plus 2.

Plevna - Sharbot Lake - Western Lanark County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 16. UV index 3 or moderate.
Monday night..Clear. Low plus 4.

Smiths Falls - Perth - Eastern Lanark County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 this evening. Low plus 2.
Monday..Sunny. High 16. UV index 3 or moderate.
Monday night..Clear. Low plus 4.

Port Carling - Port Severn.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..A mix of sun and cloud. High 16. UV index 3 or moderate.
Monday night..A few clouds. Low plus 4.

Bracebridge - Gravenhurst.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..A mix of sun and cloud. High 15. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

Town of Parry Sound - Rosseau - Killbear Park.
Tonight..Clear. Wind southwest 20 km/h gusting to 40. Low plus 5.
Monday..A mix of sun and cloud. Wind southwest 20 km/h becoming light
 in the afternoon. High 15. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

Huntsville - Baysville.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 4.
Monday..Mainly cloudy. High 15. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

Haliburton - Minden - Southern Haliburton County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 2.
Monday..A mix of sun and cloud. High 16. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

Oxtongue Lake - Fort Irwin - Northern Haliburton County.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 2.
Monday..Increasing cloudiness early in the morning. High 16. UV
 index 3 or moderate.
Monday night..Clear. Low plus 2.

Barry's Bay - Killaloe.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 2.
Monday..A mix of sun and cloud. High 18. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

Renfrew - Arnprior - Calabogie.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 2.
Monday..Mainly sunny. High 18. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

Petawawa - Pembroke - Cobden.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 2.
Monday..Mainly sunny. High 18. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

Western Algonquin Park - Lake of Two Rivers.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 2.
Monday..A mix of sun and cloud. High 17. UV index 3 or moderate.
Monday night..Clear. Low zero.

Deep River - Whitney - Eastern Algonquin Park.
Tonight..Clear. Wind southwest 20 km/h gusting to 40 becoming light
 near midnight. Low plus 2.
Monday..A mix of sun and cloud. High 17. UV index 3 or moderate.
Monday night..Clear. Low zero.

Bayfield Inlet - Dunchurch.
Tonight..Clear. Becoming partly cloudy before morning. Wind southwest
 20 km/h gusting to 40. Low plus 5.
Monday..Mainly cloudy. Wind southwest 20 km/h becoming light in the
 afternoon. High 15. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

South River - Burk's Falls.
Tonight..Clear. Becoming partly cloudy before morning. Wind southwest
 20 km/h gusting to 40. Low plus 5.
Monday..Mainly cloudy. Wind southwest 20 km/h becoming light in the
 afternoon. High 15. UV index 3 or moderate.
Monday night..Clear. Low plus 2.

End
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--- up 4 days, 4 hours, 53 minutes
 * Origin: Northern Realms (618:400/23)