Thunder Bay Weather: Clouds Clear Sunday as Lake Superior Strong-Wind Warning Continues

Thunder Bay should turn brighter Sunday afternoon before a sunny, cooler start to the week. Boaters face a different picture offshore, where northeast winds and one-to-1.5-metre waves require caution
THUNDER BAY – WEATHER DESK – Sunday, September 20, 2026 – A damp and cloudy start will give way to clearing skies in Thunder Bay this afternoon. The city will reach 17°C, but a north wind will make the day feel cooler near Lake Superior.
Monday and Tuesday are expected to be su