Weather in Grand Isle: January
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Average day temperature: | 58.3°F |
| Average night temperature: | 56.1°F | |
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Sea water temperature: | 62.3°F |
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Number of sunny days: | 12 days |
| Day length: | 10.3 - 10.8 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 1.5 in. | |
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forecast
| Grand Isle |
temperature
| Grand Isle |
Air temperature in January, °F
The highest day temperature during January of 2026 was 67°F. At the same time the lowest night temperature was 37°F. Daily and nightly averages during January were 56.9°F and 56.4°F.
Sea water temperature in Grand Isle in January, °F
The average sea water temperature in January of 2026 was 64.8°F. The highest and lowest sea temperatures during the month were 70.5°F and 58.1°F.
Number of sunny, partly cloudy and cloudy days in January is almost equal.
Precipitation total in January, in.
Precipitation total value in Grand Isle in January is 1.5 in. Other months of the year show relatively similar values.
The average wind speed value in January is 13.2 mph It makes January most 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 January is: 6.1.
Best time for vacation in Grand Isle
Grand Isle on a weather map
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