SC · climate averages
Charleston Weather by Month
These are climate averages, not a forecast. Station Charleston City (USW00013782), 3.3 miles from downtown, elevation 10 ft.
Charleston's warmest month is July (avg high 87.5°F), coldest is January (avg low 43.6°F) and wettest is August (6.11 in), per NOAA 1991–2020 climate normals.
- Warmest high July 87.5°F
- Coldest low January 43.6°F
- Wettest month August 6.11 in
- Year of rain 12 months 44.26 in
Monthly Averages
Charleston's 12 monthly precipitation normals add up to 44.26 inches a year.
November is the driest month, with a precipitation normal of 2.30 inches.
Charleston averages 101.9 days a year with at least 0.01 inch of precipitation.
| Month | Avg high | Avg low | Precipitation | Days ≥ 0.01 in |
|---|---|---|---|---|
| January | 58.0°F | 43.6°F | 2.56 in | 8.4 |
| February | 60.3°F | 46.1°F | 2.56 in | 8.0 |
| March | 65.6°F | 52.0°F | 3.03 in | 7.9 |
| April | 72.3°F | 59.7°F | 2.96 in | 7.0 |
| May | 79.0°F | 68.0°F | 2.58 in | 6.8 |
| June | 84.3°F | 74.2°F | 4.85 in | 10.5 |
| July | 87.5°F | 77.1°F | 5.08 in | 11.6 |
| August | 86.4°F | 76.5°F | 6.11 in | 11.7 |
| September | 82.6°F | 72.5°F | 5.25 in | 8.6 |
| October | 75.6°F | 63.2°F | 4.07 in | 6.8 |
| November | 67.1°F | 53.1°F | 2.30 in | 6.1 |
| December | 60.9°F | 46.8°F | 2.91 in | 8.5 |
Warmest, Coldest and Wettest Months
The warmest month is July, with an average high of 87.5°F.
The coldest month is January, with an average low of 43.6°F.
The wettest month is August, at 6.11 inches of precipitation over about 11.7 days.
In Charleston, seven months (April, May, June, July, August, September and October) have an average high of at least 70°F.
The range from the lowest average low to the highest average high in Charleston is 43.9°F.
In July, the average high in Charleston is 10.4°F above the average low.
Best Months to Visit Charleston for Weather
March, April, May and November meet the weather rule on this page: an average high from 65 to 85°F and precipitation below 3.69 inches.
The rule keeps a month when the average high is from 65 to 85°F and precipitation is below 3.69 inches, the mean of the twelve monthly precipitation normals.
- March · 65.6°F
- April · 72.3°F
- May · 79.0°F
- November · 67.1°F
Nearby cities
Savannah is the closest other city on this site, 85.9 miles away. Its July average high is 92.3°F, 4.8°F warmer than Charleston.
| City | Miles | Avg high | Avg low | Precipitation |
|---|---|---|---|---|
| Savannah | 85.9 | 92.3°F | 73.7°F | 5.75 in |
About This Data
Source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991–2020. Station: CHARLESTON CITY (USW00013782), 3.3 mi from downtown, elevation 10 ft. Climate normals are 30-year averages, not forecasts. MonthSky is not affiliated with NOAA.
Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/wck8-er13. Accessed 2026-10-21.
U.S. Government work.
NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
These pages are built automatically from public NOAA data.
U.S. Monthly Climate Normals (1991-2020) dataset
NCEI dataset landing page for the monthly normals
FAQ
What is the hottest month in Charleston?
July is the warmest, with an average high of 87.5°F.
What is the wettest month in Charleston?
August is the wettest, at 6.11 inches over about 11.7 days.
How many rainy days does Charleston get a year?
The monthly counts of days with at least 0.01 inch of precipitation add up to 101.9 days.
When is the best time to visit Charleston for weather?
March, April, May and November meet the rule used on this page: average high from 65 to 85°F and precipitation below the monthly mean of 3.69 inches.