September 11-13, 2026: Northwestern Ontario Forecast

Summer Warmth Friday, Sharp Cooldown Saturday
Thunder Bay – WEATHER – Friday, September 11, 2026 – Northwestern Ontario gets one more burst of summer-like warmth Friday before a cold front brings showers, possible thunderstorms and a dramatic temperature drop for the weekend.
Fort Frances reaches 26°C Friday, while Kenora, Dryden and Sioux Lookout climb to around 25°C and Armstrong reaches 27°C. By Saturday, many communities will be 10°C or more cooler, with hig