Weather in Charleston: May
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Average day temperature: | 79.8°F |
| Average night temperature: | 68.8°F | |
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Sea water temperature: | 74.0°F |
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Number of sunny days: | 16 days |
| Day length: | 13.5 - 14.2 hours | |
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Number of rainy days: | 4 days |
| Precipitation totals: | 2.4 in. | |
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forecast
| Charleston |
temperature
| Charleston |
Air temperature in May, °F
The highest day temperature during May of 2026 was 86°F. At the same time the lowest night temperature was 53°F. Daily and nightly averages during May were 77.6°F and 68.9°F.
Sea water temperature in Charleston in May, °F
The average sea water temperature in May of 2026 was 73.9°F. The highest and lowest sea temperatures during the month were 82.8°F and 68.5°F.
Mostly all days in May are sunny but cloudy days are also possible.
Precipitation total in May, in.
Precipitation total value in Charleston in May is 2.5 in. Other months of the year show relatively similar values.
The average wind speed value in May is 8.5 mph It makes May one of the most windy months 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 May is: 9.0.
Best time for vacation in Charleston
Charleston on a weather map
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