Thunder Bay – Weather Desk Update – Thunder Bay is waking up to a frigid Thursday morning, with a partly cloudy sky and temperatures deep in the minus 20s. Winds are light, but it still feels bitter with a wind chill near -31. A few flurries are possible this morning, then skies stay mostly cloudy through the day before clearing tonight. Weather TriviaCold, clear nights like the one expected tonight often happen when skies clear and winds ease—heat escapes quickly from the ground, and temperatures can drop fast even without new snow. SummaryThunder Bay weather forecast for Thursday, January 29, 2026: bitter cold near -26°C with wind chill -31, a chance of morning flurries, and clearing tonight.