Weather in Grand Isle: October
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Average day temperature: | 75.7°F |
| Average night temperature: | 73.2°F | |
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Sea water temperature: | 78.3°F |
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Number of sunny days: | 18 days |
| Day length: | 11.0 - 11.9 hours | |
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Number of rainy days: | 1 day |
| Precipitation totals: | 0.8 in. | |
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forecast
| Grand Isle |
temperature
| Grand Isle |
Air temperature in October, °F
The highest day temperature during October of 2025 was 81°F. At the same time the lowest night temperature was 57°F. Daily and nightly averages during October were 76.4°F and 75.4°F.
Sea water temperature in Grand Isle in October, °F
The average sea water temperature in October of 2025 was 80.1°F. The highest and lowest sea temperatures during the month were 84.7°F and 76.5°F.
Mostly all days in October are sunny but cloudy days are also possible.
Precipitation total in October, in.
Precipitation total value in Grand Isle in October is 0.8 in. Other months of the year show relatively similar values.
The average wind speed value in October is 11.9 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: 8.2.
Best time for vacation in Grand Isle
Grand Isle on a weather map
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