Weather in Charleston: May
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Average day temperature: | 79.9°F |
| Average night temperature: | 68.8°F | |
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Sea water temperature: | 74.1°F |
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Number of sunny days: | 15 days |
| Day length: | 13.5 - 14.2 hours | |
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Number of rainy days: | 5 days |
| Precipitation totals: | 2.5 in. | |
| more information | ||
14 days
forecast
forecast
| Charleston |
sea water
temperature
temperature
| Charleston |
Air temperature in May, °F
Show year:
2025
2024
2023
The highest day temperature during May of 2025 was 94°F. At the same time the lowest night temperature was 65°F. Daily and nightly averages during May were 83.4°F and 71.8°F.
Sea water temperature in Charleston in May, °F
Show year:
2025
2024
2023
The average sea water temperature in May of 2025 was 75.5°F. The highest and lowest sea temperatures during the month were 78.6°F and 71.6°F.
Sunny, partly cloudy and cloudy days
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 2.7 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 8.4 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: 8.5.
Best time for vacation in Charleston
Charleston on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Charleston
Local time: 22:34
December 05, friday
0000
54°F
NE
2 mph
2 mph
0300
54°F
NW
3 mph
3 mph
0600
54°F
SW
4 mph
4 mph
0900
54°F
SW
7 mph
7 mph
1200
52°F
SW
4 mph
4 mph
1500
50°F
S
7 mph
7 mph
1800
48°F
SE
6 mph
6 mph
2100
48°F
SE
2 mph
2 mph
