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Hourly Forecast
Daylight Hours
07:07
Sunrise
19:21
Sunset
Moon
Waxing Crescent
10:33
Moonrise
20:41
Moonset
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Weather in Charleston tomorrow, September 15, 2026
Charleston is set for a fine, sunny day on September 15, 2026, with only limited interruptions to the clear sky. The early hours look particularly favourable for being outside. The first half of the day looks overcast, as cloud amounts reach about 100% around 03:00. Brighter weather, if it comes, waits until later.
The day peaks near 30°C and cools toward 19°C. The air stays humid, with relative humidity between 23% and 97% and the peak around 03:00. Airflow remains manageable, reaching about 6.6 km/h around 13:00.
Expect persistent cloud later on, with amounts around 100% by 12:00. Sunshine remains the exception, not the rule. Visibility stays generally good near 14.7 km on average, though it can drop toward 12.4 km in thicker cloud or showers. Daylight runs from 07:08 to 19:19, lasting 12 hours 11 minutes of sunlight today.
Taken together, settled sunshine in Charleston on September 15, 2026 makes outdoor timing easier, with highs near 30°C.
Frequently asked questions about weather in Charleston
How warm does it get in Charleston?
The warmest month in Charleston is July, with average high temperatures of 31°C. The average temperature during this period is around 28°C.
How cold does it get in Charleston?
The coldest month in Charleston is January, with average low temperatures of 6°C. The average temperature during this period is around 10°C.
What is the wettest time of year in Charleston?
The wettest month in Charleston is August, with an average of 187mm of precipitation.
What is the driest time of year in Charleston?
The driest month in Charleston is November, with an average of 64mm of precipitation.
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