Thunder Bay Weather: Mild Wednesday, Gusty Thursday and a Cooler Friday

Thunder Bay reaches 19°C Wednesday and Thursday before a cooler Friday. Western Lake Superior waves subside Wednesday
THUNDER BAY — WEATHER — Wednesday, September 16, 2026 — Thunder Bay will enjoy a mild mix of sun and cloud Wednesday before showers become possible overnight.
Thursday remains mild, but northwest winds will increase and could gust to 40 km/h. Friday will be cooler and cloudy.
Western Lake Superior’s earlier strong-wind warning has ended. Open-lake wave