+48.3820° · -89.2502° · ELEV 0m
Thunder Bay
Canada · Ontario
Monthly weather averages for Thunder Bay, Canada — temperature highs and lows, rainfall, sunshine hours by month, and the best time to visit.
№ 01
July → FebruaryClimate Overview
Thunder Bay has a subarctic climate. The warmest month is July (23°C average high) and the coolest is February (-8°C).
№ 02
728 mm / yearRainfall by Month
Thunder Bay sees 728 mm of rain a year. The wettest month is September (92 mm); the driest is January (32 mm).
№ 03
June–AugustBest Time to Visit
June–August
10°C – 23°C · 11.9h sun
The best time to visit Thunder Bay is June–August, when temperatures average 10°C–23°C with 11.9 sunshine hours per day.
Some visitors prefer May for cooler, drier conditions.
№ 04
12 months · °C · mm · hoursMonthly Breakdown
| January | -7.6°C | -15.1°C | 32 mm | 5.1 h | 08:43 | 17:29 |
|---|---|---|---|---|---|---|
| February | -8.1°C | -15.9°C | 38 mm | 7.2 h | 08:04 | 18:18 |
| March | -0.7°C | -8.3°C | 37 mm | 8.7 h | 08:10 | 20:01 |
| April | 5.2°C | -2.6°C | 75 mm | 9.3 h | 07:06 | 20:46 |
| May | 13.1°C | 3.9°C | 67 mm | 10.7 h | 06:17 | 21:29 |
| June | 18.4°C | 9.9°C | 68 mm | 12.1 h | 05:55 | 21:59 |
| July | 22.6°C | 14.4°C | 74 mm | 12.7 h | 06:11 | 21:54 |
| August | 21.7°C | 14.5°C | 66 mm | 10.9 h | 06:50 | 21:12 |
| September | 17.9°C | 11.2°C | 92 mm | 8.9 h | 07:33 | 20:10 |
| October | 10.2°C | 4.7°C | 71 mm | 6.2 h | 08:16 | 19:08 |
| November | 2.6°C | -3.2°C | 56 mm | 4.8 h | 08:04 | 17:18 |
| December | -3.1°C | -9.9°C | 52 mm | 4.3 h | 08:41 | 17:02 |
Nearby cities
View monthly climate averages for nearby cities or compare them with Thunder Bay.
- 440 km
- 480 km
- 490 km
- 540 km
- 590 km
Temperature, rainfall and sunshine, month by month.