Weather in Grand Isle: May
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Average day temperature: | 78.5°F |
| Average night temperature: | 75.9°F | |
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Sea water temperature: | 79.9°F |
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Number of sunny days: | 12 days |
| Day length: | 13.3 - 13.9 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 1.4 in. | |
| more information | ||
14 days
forecast
forecast
| Grand Isle |
sea water
temperature
temperature
| Grand Isle |
Air temperature in May, °F
Show year:
2025
2024
2023
The highest day temperature during May of 2025 was 83°F. At the same time the lowest night temperature was 67°F. Daily and nightly averages during May were 77.6°F and 75.9°F.
Sea water temperature in Grand Isle in May, °F
Show year:
2025
2024
2023
The average sea water temperature in May of 2025 was 81.1°F. The highest and lowest sea temperatures during the month were 85.6°F and 76.5°F.
Sunny, partly cloudy and cloudy days
Number of sunny, partly cloudy and cloudy days in May is almost equal.
Precipitation total in May, in.
Precipitation total value in Grand Isle in May is 1.4 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 11.6 mph
Average sunny hours
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 May is: 7.6.
Best time for vacation in Grand Isle
Grand Isle on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Grand Isle
Local time: 00:57
December 05, friday
0300
59°F
S
14 mph
14 mph
0600
57°F
S
12 mph
12 mph
0900
54°F
S
14 mph
14 mph
1200
54°F
S
10 mph
10 mph
1500
57°F
S
12 mph
12 mph
1800
59°F
SW
12 mph
12 mph
2100
57°F
SW
11 mph
11 mph
December 06, saturday
0000
59°F
SW
9 mph
9 mph
