Weather in Thunder Bay: January
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Average day temperature: | 14.8°F |
| Average night temperature: | 10.8°F | |
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Sea water temperature: | 34.5°F |
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Number of sunny days: | 5 days |
| Day length: | 8.4 - 9.5 hours | |
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Number of rainy days: | 0 days |
| Precipitation totals: | 0.3 in. | |
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forecast
| Thunder Bay |
temperature
| Thunder Bay |
Air temperature in January, °F
| Day temperature | Night temperature |
The highest day temperature during January of 2025 was 33°F. At the same time the lowest night temperature was -18°F. Daily and nightly averages during January were 14.1°F and 7.6°F.
Sea water temperature in Thunder Bay in January, °F
The average sea water temperature in January of 2025 was 35.1°F. The highest and lowest sea temperatures during the month were 36.3°F and 34.0°F.
| Sunny days | |
| Partly cloudy days | |
| Cloudy days |
Mostly all days in January are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in January, in.
Precipitation total value in Thunder Bay in January is 0.3 in. Other months of the year show relatively similar values.
The average wind speed value in January is 8.5 mph
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in January is: 3.6.
Best time for vacation in Thunder Bay
Thunder Bay on a weather map
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