Weather in Groton: October
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Average day temperature: | 62.2°F |
| Average night temperature: | 51.9°F | |
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Sea water temperature: | 64.0°F |
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Number of sunny days: | 14 days |
| Day length: | 10.4 - 11.7 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 1.4 in. | |
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forecast
| Groton |
temperature
| Groton |
Air temperature in October, °F
The highest day temperature during October of 2025 was 77°F. At the same time the lowest night temperature was 34°F. Daily and nightly averages during October were 62.1°F and 49.4°F.
Sea water temperature in Groton in October, °F
The average sea water temperature in October of 2025 was 65.0°F. The highest and lowest sea temperatures during the month were 69.4°F and 60.4°F.
Mostly all days in October are sunny but cloudy days are also possible.
Precipitation total in October, in.
Precipitation total value in Groton in October is 1.4 in. Other months of the year show relatively similar values.
The average wind speed value in October 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 October is: 6.8.
Best time for vacation in Groton
Groton on a weather map
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