Charleston, South Carolina Weather
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Climate of Charleston: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Charleston, with average daytime highs around 32°C. January is the coolest, when nights typically fall to about 4°C.
The area receives about 1250 mm of rain in a typical year. Most of it falls from June to October (around 55% of the yearly total), and August is the wettest month at roughly 171 mm.
For outdoor plans and travel, March to May and November usually offer the most comfortable weather in Charleston, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 14° | 4° | 61 mm | 80% |
| Feb | 16° | 6° | 84 mm | 80% |
| Mar | 20° | 9° | 84 mm | 78% |
| Apr | 24° | 13° | 82 mm | 75% |
| May | 28° | 18° | 92 mm | 73% |
| Jun | 31° | 22° | 140 mm | 76% |
| Jul | 32° | 24° | 147 mm | 76% |
| Aug | 31° | 23° | 171 mm | 79% |
| Sep | 29° | 21° | 119 mm | 80% |
| Oct | 25° | 15° | 105 mm | 78% |
| Nov | 20° | 9° | 69 mm | 79% |
| Dec | 16° | 6° | 91 mm | 82% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Charleston. Values describe typical conditions, not a forecast.
About Charleston weather
Charleston is set in South Carolina's humid subtropical climate, coastal and low-lying for much of the state, about 170 km south-east of Columbia. Summers bring hot, humid summers (June–August) with highs commonly in the low-to-mid 30s°C. The year winds down with mild winters (December–February), rarely dropping below freezing near the coast. This page shows live, auto-refreshing weather for Charleston: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/New_York.
Frequently asked questions
Charleston is about 170 km south-east of Columbia, in South Carolina.
Charleston sees mild winters (December–February), rarely dropping below freezing near the coast.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Charleston's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Charleston, with average daytime highs of about 32°C and nights around 24°C.
The coldest nights come in January, when the average low is about 4°C and daytime highs reach around 14°C.
Charleston receives about 1250 mm of rain in a typical year. August is the wettest month at roughly 171 mm, and the main rainy period is June to October.
March to May and November usually offer the most comfortable weather in Charleston, with mild daytime temperatures and little rain.
In November Charleston typically sees daytime highs near 20°C and lows near 9°C, with about 69 mm of rain over the month and average humidity around 79%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Charleston is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Charleston's day-to-day weather follows the broader pattern of South Carolina described above. See the hourly weather forecast or the air quality index for more detail.