Thunder Bay Climate by Month
Thunder Bay, Ontario, Canada
Warm summers and bitterly cold winters, with rain spread through the year.
Warm summers and bitterly cold winters, with rain spread through the year: that's Thunder Bay's climate in short. Afternoon highs range from 19°F (-7°C) in January to 78°F (26°C) in July, and January nights average -1°F (-18°C). About 28 in (718 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 78°F(26°C)
- Average high, July
- Coldest nights
- -1°F(-18°C)
- Average low, January
- Rain per year
- 28 in(718 mm)
- No clear rainy season
- Humidity
- 76%
- Sunniest: June
Best and worst months in Thunder Bay
Best for weatherJune to August are the best time for weather in Thunder Bay: highs near 75°F (24°C) and about 3.2 in (82 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 19°F (-7°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in August.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Thunder Bay weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 19°F(-7°C) | -1°F(-18°C) | 1.3 in(33 mm) | 88% | 1.1 |
| FebFebruary | 23°F(-5°C) | 0°F(-18°C) | 1.0 in(26 mm) | 78% | 2.0 |
| MarMarch | 35°F(1°C) | 13°F(-11°C) | 1.5 in(37 mm) | 69% | 3.2 |
| AprApril | 48°F(9°C) | 26°F(-3°C) | 2.2 in(55 mm) | 67% | 4.5 |
| MayMay | 62°F(17°C) | 39°F(4°C) | 3.1 in(80 mm) | 64% | 5.3 |
| JunJuneBest | 72°F(22°C) | 48°F(9°C) | 3.1 in(79 mm) | 67% | 5.8 |
| JulJulyBest | 78°F(26°C) | 54°F(12°C) | 3.6 in(91 mm) | 69% | 5.7 |
| AugAugustBest | 76°F(25°C) | 53°F(12°C) | 3.0 in(77 mm) | 72% | 4.8 |
| SepSeptember | 66°F(19°C) | 45°F(7°C) | 3.1 in(80 mm) | 79% | 3.5 |
| OctOctober | 52°F(11°C) | 35°F(2°C) | 2.6 in(67 mm) | 73% | 1.9 |
| NovNovember | 37°F(3°C) | 22°F(-6°C) | 2.0 in(50 mm) | 90% | 1.1 |
| DecDecember | 24°F(-4°C) | 7°F(-14°C) | 1.7 in(43 mm) | 97% | 0.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate
All 20 places like Thunder Bay →- 🇷🇺YanaulBashkortostan Republic, Russia · Pop. 28k91%matchSame summer highsSame winter lowsThunder Bay vs Yanaul →
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