Charleston weather in September 2025

Expect 28°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Charleston in September. Check more long-term weather averages for Charleston in September before you book your next holiday to South Carolina in 2025/2026.

  • 28°C maximum daytime temperature in September in Charleston28
    28°C max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in September in Charleston9
    9 days with some rainfall
  • 21°C minimum night-time temperature in September in Charleston21
    21°C min night temperature
  • 12 hours of daylight per day in September in Charleston12
    12 hours of daylight per day
  • Moderate heat & humidity in September in CharlestonM
    Moderate heat & humidity
  • 121 mm monthly rainfall in September in Charleston121
    121 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Charleston8
    8 (Very High) UV index
  • 27°C sea temperature in September in Charleston27
    27°C sea temperature

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The September weather guide for South Carolina (Charleston) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Charleston in September?

Daytime temperatures usually reach 28°C in Charleston in September with moderate heat and humidity, falling to 21°C at night.

How sunny is it in Charleston in September?

There are normally 7 hours of bright sunshine each day in Charleston in September - that's 59% of daylight hours.

How warm is the sea around Charleston in September?

The average sea temperature around Charleston in September is 27°C.

Does it rain in Charleston in September?

There are usually 9 days with some rain in Charleston in September and the average monthly rainfall is 121mm.

What is the chance of a hurricane in Charleston in September?

On average 1.3 days in September in Charleston are likely to be affected by the passage of one or more tropical storms.

Charleston September sunrise & sunset times

Browse the sunrise and sunset times for Charleston in September 2025. Select a month to view Charleston sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:55 18:44
Monday, 15th September 2025 06:04 18:25
Tuesday, 30th September 2025 06:13 18:05

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