Charleston, South Carolina Climate by Month
Charleston, South Carolina, United States
Hot summers and cool winters, with rain spread through the year.
Charleston has hot summers and cool winters, with rain spread through the year. July is the warmest month, with highs around 90°F (32°C); January is the coolest at 59°F (15°C), and nights dip to 40°F (4°C). It gets 51 in (1304 mm) of rain a year, spread across the months.
- Warmest month
- 90°F(32°C)
- Average high, July
- Coldest nights
- 40°F(4°C)
- Average low, January
- Rain per year
- 51 in(1304 mm)
- No clear rainy season
- Humidity
- 71%
- Sunniest: May
Best and worst months in Charleston
Best for weatherThe most comfortable weather comes in April, with highs around 76°F (24°C) and about 3.3 in (83 mm) of rain a month.
Least pleasantJuly and August are the least pleasant; August is the wettest, with 7.5 in (190 mm) of rain.
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in April.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Charleston weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 59°F(15°C) | 40°F(4°C) | 3.3 in(83 mm) | 67% | 2.7 |
| FebFebruary | 62°F(17°C) | 42°F(6°C) | 3.0 in(75 mm) | 67% | 3.4 |
| MarMarch | 69°F(20°C) | 48°F(9°C) | 3.6 in(91 mm) | 66% | 4.6 |
| AprAprilBest | 76°F(24°C) | 55°F(13°C) | 3.3 in(83 mm) | 66% | 5.7 |
| MayMay | 82°F(28°C) | 64°F(18°C) | 3.2 in(81 mm) | 69% | 6.3 |
| JunJune | 87°F(31°C) | 71°F(22°C) | 5.9 in(151 mm) | 74% | 6.0 |
| JulJuly | 90°F(32°C) | 74°F(23°C) | 6.5 in(165 mm) | 75% | 6.1 |
| AugAugust | 89°F(32°C) | 73°F(23°C) | 7.5 in(190 mm) | 77% | 5.4 |
| SepSeptember | 85°F(29°C) | 69°F(21°C) | 5.8 in(148 mm) | 76% | 4.5 |
| OctOctober | 78°F(25°C) | 59°F(15°C) | 3.4 in(86 mm) | 72% | 3.8 |
| NovNovember | 69°F(21°C) | 48°F(9°C) | 2.5 in(64 mm) | 72% | 3.0 |
| DecDecember | 62°F(17°C) | 42°F(6°C) | 3.4 in(87 mm) | 75% | 2.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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