Charleston Weather in September
In Charleston, September brings high daytime temperatures around 29°C (84°F), with nights cooling to 22°C (72°F). Expect quite a bit of rainfall this month.
Rainfall in Charleston in September
The climate data from previous years indicates about 11 days of rain, averaging 146 mm (5.7 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Charleston in September
In September, Charleston gets high temperatures, with highs of 29°C (84°F). Nights cool to around 22°C (72°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 22°C (72°F), evenings stay pleasantly warm.
Sunshine in Charleston in September
With approximately 221 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.For Charleston itself, April and May generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Charleston's climate page.
Charleston Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
29°C (84°F)
Chance of Rain
37%
Precipitation
146 mm (5.7 in)
Rainy days
11 days
Humidity
78%
Sunshine
221 hours
Percentage Sunshine
59%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Charleston typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows typically ranging from 19°C (66°F) to 23°C (73°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Charleston in September
Browse day-by-day weather records for Charleston spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Charleston historical weather extremes in September
The extremes listed below come from historical weather data collected in Charleston from 1976 through 2025.
- On September 4, 2020, temperatures climbed to 36°C (97°F), marking the warmest September day on record.
- The coldest September day was on September 24, 1995, with a maximum of 16°C (61°F).
- Charleston registered its coldest September night on September 23, 1983, with temperatures dropping to 10°C (50°F).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
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What to Wear in Charleston in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Charleston in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Charleston's climate page.
Temperature Rainfall Sunshine Humidity
See the full Charleston climate overview or explore weather in the United States of America.
