Weather in Groton: August
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Average day temperature: | 78.2°F |
| Average night temperature: | 66.5°F | |
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Sea water temperature: | 70.6°F |
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Number of sunny days: | 10 days |
| Day length: | 13.1 - 14.4 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 1.1 in. | |
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forecast
| Groton |
temperature
| Groton |
Air temperature in August, °F
The highest day temperature during August of 2025 was 86°F. At the same time the lowest night temperature was 56°F. Daily and nightly averages during August were 77.1°F and 63.5°F.
Sea water temperature in Groton in August, °F
The average sea water temperature in August of 2025 was 70.3°F. The highest and lowest sea temperatures during the month were 74.1°F and 68.7°F.
Number of sunny, partly cloudy and cloudy days in August is almost equal.
Precipitation total in August, in.
Precipitation total value in Groton in August is 1.1 in. Other months of the year show relatively similar values.
The average wind speed value in August is 7.2 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: 7.9.
Best time for vacation in Groton
Groton on a weather map
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