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

More about Charleston

Charleston by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for South Carolina

Virgin Holidays: Latest offers on 2024 holidays

  • Book online & save on long haul holidays in 2024
  • Destinations include New York, Caribbean & beyond
  • Ideal for summer, winter & half term family holidays
Go to Virgin Holidays deal >>

View all Virgin Holidays offers

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)

Back to top

More about the USA

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^