Weather in Grand Isle: May
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Average day temperature: | 78.3°F |
| Average night temperature: | 75.9°F | |
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Sea water temperature: | 79.8°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: | 1.9 in. | |
| more information | ||
14 days
forecast
forecast
| Grand Isle |
sea water
temperature
temperature
| Grand Isle |
Air temperature in May, °F
Show year:
2026
2025
2024
The highest day temperature during May of 2026 was 80°F. At the same time the lowest night temperature was 64°F. Daily and nightly averages during May were 76.9°F and 76.5°F.
Sea water temperature in Grand Isle in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 79.4°F. The highest and lowest sea temperatures during the month were 85.6°F and 74.5°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 1.9 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: 8.0.
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: 22:40
June 13, saturday
0000
82°F
NE
11 mph
11 mph
0300
82°F
NE
7 mph
7 mph
0600
81°F
E
5 mph
5 mph
0900
82°F
SE
3 mph
3 mph
1200
84°F
NW
6 mph
6 mph
1500
86°F
N
11 mph
11 mph
1800
84°F
N
12 mph
12 mph
2100
82°F
NE
12 mph
12 mph
