Long-Range Weather Forecast for Sarnia, ON

October 2026 Long Range Weather Forecast for Southern Ontario

Dates	Weather Conditions
Oct 1-6	Sunny, chilly
Oct 7-14	Rainy periods; warm, then chilly
Oct 15-21	Rainy periods east, rain and snow showers west; chilly
Oct 22-31	A few showers east, sunny west; warm
October	temperature 11°C (avg.) precipitation 90mm (40mm above avg. east, 20mm below west)

November 2026 Long Range Weather Forecast for Southern Ontario

Dates	Weather Conditions
Nov 1-6	Sunny, warm
Nov 7-11	A few showers east, sunny west; warm
Nov 12-17	Sunny, chilly
Nov 18-22	Snowy, cool
Nov 23-26	Rain showers, mild
Nov 27-30	Flurries, colder
November	temperature 4.5°C (1°C above avg. east, 4°C above west) precipitation 45mm (25mm below avg.)

12-Month Long-Range Weather Outlook

November 2026 to October 2027

Winter will be colder than normal in the east and warmer west. Precipitation will be below normal, with above-normal snowfall. The coldest periods will be in mid- and late January and early and late February. The snowiest periods will be in early and late January, as well as mid-March. April and May will be warmer than normal, with below-normal rainfall. Summer will be cooler than normal, with rainfall below normal in the east and above west. The hottest periods will be in mid-July and mid-August. September and October will be warmer and wetter than normal.

See the complete 12-month weather forecast in The Old Farmer’s Almanac..

Weather Trend Graph

November 2026 to October 2027