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Climate · Charleston

Charleston in September

Hot and wet, as the days shorten.

Typical weather, averaged over 30 years

September in Charleston is hot: highs near 85°F, lows near 73°F. Rain falls on about four days a week, less often as the month goes on, and the days shorten by 44 minutes from the first week to the last.September in Charleston is hot: highs near 29°C, lows near 23°C. Rain falls on about four days a week, less often as the month goes on, and the days shorten by 44 minutes from the first week to the last.

High
85°F29°Caverage
Low
73°F23°Caverage
Wet days
4a week · 52% of days
Daylight
12h 18mon average

Is September a good time to visit Charleston?

September sits outside Charleston's best months, which run in two parts: April, or October to November. Expect hot days and rain on about four days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 85°F in September, against 62°F to 90°F through the year.Highs near 29°C in September, against 17°C to 32°C through the year.

Chance of a wet day

52% of days in September, against 24% to 67% through the year.

Cloud cover

49% cover in September, against 38% to 57% through the year.

Daylight

12h 18m in September, against 10h 01m to 14h 16m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August89°32°low 77°low 25°5 wet days a weekRain on about five days a week.
  2. September85°29°low 73°low 23°4 wet days a weekRain on about four days a week.
  3. October79°26°low 65°low 18°2 wet days a weekRain on about two days a week.

Where Charleston sits, in September

America/New York
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
7:03 AMsets 7:28 PM
Above the sea
0 mlow-lying
Latitude
32.8°Nnorthern hemisphere
Nearest of ours
Bluffton106 km south-west

The land around Charleston, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in September

high · low · wet days
See September on the planning mapThe whole year in Charleston

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Charleston. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.