United StatesAverage weather for Charleston in September
It's hot in September in Charleston with an average temperature of 30°C. Temperatures this month range from a low of 27°C to a high of 31°C. At night, you can expect temperatures between 19°C and 24°C.
Start of September
The month of September starts in Charleston with hot temps, averaging around 31°C during the day and nights around 24°C. You can expect regular precipitation, but there will also be some sunny days in the early part of the month. Light clothing like shorts or a dress, and a hat and sunglasses are perfect.
Mid September
By mid-September, daytime temps drop to around 30°C, with nights around 23°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of September
By the end of September, the average daytime temperature in Charleston is around 29°C, while nighttime temps are about 21°C. A shower might pop up, but overall, the weather will be dry and sunny.
Because temperatures drop in the evening, wearing layers is recommended.
Water temperature
The water temperature at Charleston is 32°C this month. It’s really warm, perfect for a swim.
In September, there is an average of 104 mm of precipitation, spread over 9 days. The wind speed is around 3 Bft, mostly coming from the Southeast.
Charleston in September |
New York | ||
|---|---|---|---|
 Average temperature |
30°C | 27°C | |
 Max. temperature |
31°C | 31°C | |
| Min. temperature |
27°C | -5°C | |
 Total precipitation |
104 mm | 57 mm | |
| Rainy days |
9 days | 9 days | |
August
UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is September a good time to visit Charleston?
Looking for sun? September isn’t a good month to be in Charleston. The temperature is nice, but there’s too much chance of rain.
Temperature records
With 37°C in 2020, Charleston reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 17°C in 2022. The extreme nighttime temperatures ranged from a lowest recorded value of 11°C to a highest value of 28°C.
Check out the climate of Charleston for all months and discover the best travel time
Daily Temperature in September in Charleston
This chart shows the average daily high and low temperatures in September for Charleston, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in Charleston
The chart below shows the average daily precipitation in September for Charleston, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 9 days of precipitation in Charleston.
Daily UV index in September in Charleston
This chart shows the average daily UV index in September in Charleston, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Charleston over the years
This chart shows the average temperature in September in Charleston, measured in degrees Celsius, over the past few years.
Total precipitation in September in Charleston over the years
This chart shows the average precipitation in September in Charleston, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in September for Charleston
Click on any day in September to get detailed info about the usual weather on that day in Charleston. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Charleston
Have you been to Charleston in September?
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Average weather in Charleston by month
Click on a month below to see detailed weather info for Charleston. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Charleston for all months at once
