Thunder Bay Weather: Morning Fog and Spotty Showers Before a Sunny Monday

Thunder Bay’s September 27-29 forecast brings morning fog, possible Sunday showers, a sunny Monday and rain Tuesday. Lake Superior winds remain modest
THUNDER BAY – WEATHER DESK – Sunday, September 27, 2026 – Patchy fog may slow the morning drive in Thunder Bay before visibility improves. The city then faces a cloudy Sunday with a few possible showers, followed by a brighter and mild Monday. A more organized period of rain is expected Tuesday.
Conditions on Western Lake S