Thunder Bay Weather & Climate

Canada

Thunder Bay sees feels-like daytime highs peak around 25.3°C in July and nighttime lows bottom out near -17.7°C in January. June is the wettest month (~64 mm), while January is the driest (~2 mm). For sunshine, August leads with about 66% clear skies.

Best time to visit Thunder Bay

Based on mild feels-like temperatures and low rain chances, the most comfortable months are July, August, and June — expect around 15.225.3°C with roughly 29% chance of rain on a given day in July.

Thunder Bay climate by month

MonthLow / High °CRain %RainfallClear skiesWind
January-17.7° / -9.8°1%2 mm35%15.2 kph
February-15.7° / -7.6°1%3 mm36%14.6 kph
March-9.8° / -1.4°5%10 mm40%13.6 kph
April-2.1° / 7.3°13%28 mm45%12.3 kph
May4.8° / 14.8°27%54 mm48%10.3 kph
June10.8° / 21.2°31%64 mm54%9 kph
July15.2° / 25.3°29%60 mm63%8.8 kph
August14.4° / 24.2°26%54 mm66%9.7 kph
September9.3° / 17.9°25%54 mm59%11.2 kph
October2.2° / 9.3°21%48 mm50%12.9 kph
November-6.1° / 0°9%25 mm43%14.2 kph
December-14.1° / -7.5°3%8 mm37%15 kph

Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).

Want to catch Thunder Bay at its best?

Save your perfect conditions and get an email when a forecast matches.

Set up a free alert