Thunder Bay weather by month & the best time to visit
🇨🇦 Canada · regional city · continental climate
The best time to visit Thunder Bay is August — its sunniest month (Sunshine Score 79/100), with July and June close behind. Thunder Bay averages about 1,985 hours of sunshine a year. Daytime highs around 24°C / 75°F and roughly 59 mm of rain in August.
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- Sun hours / year
- 1,985
- Sunniest month
- August
- Peak score
- 79/100
- Rain / year
- 632 mm
- Snow / year
- ≈1.9 m
- Midday UV at peak
- 6 (high)
- Population
- 109k
- Elevation
- 195 m
When is the best time to visit Thunder Bay?
For sunshine, the best time to visit Thunder Bay is August, then July and June. The dullest month is January (0/100, 26 mm of rain). The full month-by-month picture is in the table below.
How sunny is Thunder Bay?
Thunder Bay gets a moderate 1,985 hours of sunshine a year. 79 Sunshine Score points separate August (79) from January (0), so the month you pick matters. It ranks #133 of 242 destinations in Canada for annual sunshine, below the national median of 2,024 hours. The year's 632 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV |
|---|---|---|---|---|---|
| January | 0 | -8° / 18°F | -17° / 1°F | 26 mm | 0 |
| February | 0 | -7° / 19°F | -16° / 3°F | 20 mm | 1 |
| March | 0 | 1° / 34°F | -9° / 16°F | 30 mm | 2 |
| April | 7 | 9° / 48°F | -2° / 28°F | 55 mm | 4 |
| May | 51 | 16° / 61°F | 4° / 39°F | 72 mm | 5 |
| June | 74 | 21° / 70°F | 10° / 50°F | 86 mm | 6 |
| July | 77 | 25° / 77°F | 13° / 55°F | 75 mm | 6 |
| August | 79 | 24° / 75°F | 13° / 55°F | 59 mm | 5 |
| September | 71 | 19° / 66°F | 9° / 48°F | 70 mm | 4 |
| October | 13 | 10° / 50°F | 2° / 36°F | 66 mm | 2 |
| November | 0 | 3° / 37°F | -4° / 25°F | 40 mm | 1 |
| December | 0 | -5° / 23°F | -12° / 10°F | 33 mm | 0 |
See Thunder Bay on the interactive sunshine globe →
Nearby places for sunshine
- Sioux Lookout Canada · 269 km · best in Aug · 2,060 h sun/yr
- Duluth United States · 275 km · best in Sep · 2,261 h sun/yr
- Green Bay United States · 442 km · best in Jul · 2,244 h sun/yr
- Appleton United States · 462 km · best in Jul · 2,243 h sun/yr
- Minneapolis United States · 489 km · best in Sep · 2,337 h sun/yr
- Traverse City United States · 495 km · best in Jul · 1,987 h sun/yr
Nearest destinations
- Hancock United States · 148 km · 1,893 h sun/yr · best in Aug
- Ironwood United States · 214 km · 2,052 h sun/yr · best in Aug
- Marquette United States · 267 km · 1,842 h sun/yr · best in Aug
- Nakina Canada · 277 km · 2,110 h sun/yr · best in Aug
Head-to-head
How Thunder Bay compares month by month: Thunder Bay vs Green Bay · Thunder Bay vs Duluth · Thunder Bay vs Sioux Lookout · all comparisons
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