Northwestern Ontario weather for September 9-11, 2026

September 9-11, 2026: Northwestern Ontario Forecast — Cool and Windy Wednesday, Warmer Thursday, Showers Return Friday
Thunder Bay – WEATHER – Wednesday, September 9, 2026 – Northwestern Ontario is getting a definite taste of fall Wednesday as northwest winds, scattered showers and cooler temperatures spread across the region.
The change is short-lived. Sunshine and much warmer temperatures return Thursday, with highs climbing into the low 20s. Friday stays warm, but anot