Charleston County · South Carolina
Charleston, SC weather averages
NOAA climate normals for 1991-2020, measured at Charleston Intl Ap, 17.8 km from the city centre — month by month temperature, rain and snow.
Quick answer
Charleston averages a daily high of 76.2°F and a daily low of 55.6°F across the year, with 51.03 inches of precipitation. July is the warmest month at 91.1°F and January the coldest at 37.5°F.
- Average annual high
- 76.2°FWarmest month July
- Average annual low
- 55.6°FColdest month January
- Precipitation per year
- 51.03 inWettest month August
- Snowfall per year
- 0.5 in24.4 days at or below 32°F
Charleston weather month by month
Normal daily high and low, precipitation and snowfall for each month, 1991-2020.
| Month | High °F | Low °F | Precip in | Snow in | Range |
|---|---|---|---|---|---|
| January | 59 | 37.5 | 3.71 | 0 | 37.5 to 59 degrees |
| February | 62.8 | 40.6 | 2.96 | 0.2 | 40.6 to 62.8 degrees |
| March | 69.6 | 46.7 | 3.71 | 0 | 46.7 to 69.6 degrees |
| April | 76.4 | 53.3 | 2.91 | 0 | 53.3 to 76.4 degrees |
| May | 83.2 | 61.8 | 3.02 | 0 | 61.8 to 83.2 degrees |
| June | 88.4 | 69.6 | 5.65 | 0 | 69.6 to 88.4 degrees |
| July | 91.1 | 73 | 6.53 | 0 | 73 to 91.1 degrees |
| August | 89.5 | 72.3 | 7.15 | 0 | 72.3 to 89.5 degrees |
| September | 84.8 | 67.2 | 6.1 | 0 | 67.2 to 84.8 degrees |
| October | 77.1 | 56.8 | 3.75 | 0 | 56.8 to 77.1 degrees |
| November | 69.8 | 47.5 | 2.43 | 0 | 47.5 to 69.8 degrees |
| December | 61.6 | 40.1 | 3.11 | 0.3 | 40.1 to 61.6 degrees |
Source: NOAA NCEI, U.S. Climate Normals 1991-2020 — station USW00013880, Charleston Intl Ap · rates as published for 1991-2020 normals
How to read Charleston climate normals
What a climate normal is, and what it is not.
A normal is the average of thirty years of daily observations at one station — here Charleston Intl Ap, 17.8 km from the centre of Charleston. It describes a typical year, so any single year will run warmer, cooler, wetter or drier. Readings taken at an airport on the edge of town usually sit a degree or two below a dense downtown on summer nights. Charleston sees about 55.2 days a year at or above 90°F and about 74.4 days with a tenth of an inch of precipitation or more.
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Other Charleston data on this site.