Weather in Rennes: August
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Average day temperature: | 74.1°F |
| Average night temperature: | 57.2°F | |
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Sea water temperature: | 65.9°F |
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Number of sunny days: | 12 days |
| Day length: | 13.4 - 15.0 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 1.5 in. | |
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forecast
| Rennes |
temperature
| Rennes |
Air temperature in August, °F
The highest day temperature during August of 2025 was 95°F. At the same time the lowest night temperature was 50°F. Daily and nightly averages during August were 80.2°F and 56.9°F.
Sea water temperature in Rennes in August, °F
The average sea water temperature in August of 2025 was 67.3°F. The highest and lowest sea temperatures during the month were 68.2°F and 65.7°F.
Number of sunny, partly cloudy and cloudy days in August is almost equal.
Precipitation total in August, in.
Precipitation total value in Rennes in August is 1.2 in. Other months of the year show relatively similar values.
The average wind speed value in August is 8.5 mph It makes August one of the least windy months 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 August is: 9.0.
Best time for vacation in Rennes
Rennes on a weather map
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