Thunder Bay weather for September 9-11, 2026

September 9-11, 2026: Thunder Bay Forecast — Windy Wednesday, Sunny Thursday, Showers Return Friday
THUNDER BAY – WEATHER – Wednesday, September 9, 2026 – Thunder Bay is in for a windy Wednesday before conditions improve significantly Thursday. Friday turns warmer, but another chance of showers develops.
On Western Lake Superior, strong west-to-northwest winds and waves near 2 metres make Wednesday the roughest boating day of the three. Winds ease Thursday before turning