Discover the weather in Thunder Bay, Ontario. Find out about the temperature, precipitation, and other climatic conditions in this Canadian city.
The weather in Thunder Bay can vary throughout the year. Summers are generally warm with temperatures reaching highs in the 20-30 degrees Celsius (68-86 degrees Fahrenheit) range. Winters are cold and snowy with temperatures dropping below freezing, often reaching lows in the -20 to -30 degrees Celsius (-4 to -22 degrees Fahrenheit) range. Thunder Bay also experiences a fair amount of precipitation throughout the year, including rain, snow, and occasional thunderstorms.