Weather in Thunder Bay: July
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Average day temperature: | 69.3°F |
| Average night temperature: | 58.3°F | |
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Sea water temperature: | 59.6°F |
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Number of sunny days: | 12 days |
| Day length: | 15.1 - 16.0 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 0.8 in. | |
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forecast
| Thunder Bay |
temperature
| Thunder Bay |
Air temperature in July, °F
The highest day temperature during July of 2025 was 81°F. At the same time the lowest night temperature was 49°F. Daily and nightly averages during July were 69.6°F and 57.0°F.
Sea water temperature in Thunder Bay in July, °F
The average sea water temperature in July of 2025 was 61.1°F. The highest and lowest sea temperatures during the month were 64.9°F and 55.2°F.
Number of sunny, partly cloudy and cloudy days in July is almost equal.
Precipitation total in July, in.
Precipitation total value in Thunder Bay in July is 0.8 in. Other months of the year show relatively similar values.
The average wind speed value in July is 5.8 mph It makes July lest windy month of the year.
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 July is: 9.3.
Best time for vacation in Thunder Bay
Thunder Bay on a weather map
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