Charleston weather by month
What a typical year looks like in Charleston, South Carolina: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Downtown Charleston, 8 km from Charleston; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 44.3 in1124 mm
- Snow a year
- Rare
- Last spring freeze
- Feb 6
- First fall freeze
- Dec 11
- Heating degree days
- 1,625
- Cooling degree days
- 2,448
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 31°−1° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Charleston in January
Highs average 58°14° and lows 44°6°, with 2.6 in65 mm of precipitation in a typical January.
- Record high
- 82°28° (1937)
- Record low
- 10°−12° (1985)
- Heating degree days
- 442
- Cooling degree days
- 2
Charleston in February
Highs average 60°16° and lows 46°8°, with 2.6 in65 mm of precipitation in a typical February.
- Record high
- 83°28° (1962)
- Record low
- 7°−14° (1899)
- Heating degree days
- 334
- Cooling degree days
- 3
Charleston in March
Highs average 66°19° and lows 52°11°, with 3 in77 mm of precipitation in a typical March.
- Record high
- 94°34° (1907)
- Record low
- 22°−6° (1980)
- Heating degree days
- 213
- Cooling degree days
- 21
Charleston in April
Highs average 72°22° and lows 60°15°, with 3 in75 mm of precipitation in a typical April.
- Record high
- 94°34° (1980)
- Record low
- 36°2° (1907)
- Heating degree days
- 62
- Cooling degree days
- 92
Charleston in May
Highs average 79°26° and lows 68°20°, with 2.6 in66 mm of precipitation in a typical May.
- Record high
- 100°38° (2019)
- Record low
- 45°7° (1894)
- Heating degree days
- 6
- Cooling degree days
- 269
Charleston in June
Highs average 84°29° and lows 74°23°, with 4.9 in123 mm of precipitation in a typical June.
- Record high
- 104°40° (1944)
- Record low
- 49°9° (1913)
- Heating degree days
- 0
- Cooling degree days
- 428
Charleston in July
Highs average 88°31° and lows 77°25°, with 5.1 in129 mm of precipitation in a typical July.
- Record high
- 103°39° (1902)
- Record low
- 61°16° (1933)
- Heating degree days
- 0
- Cooling degree days
- 536
Charleston in August
Highs average 86°30° and lows 77°25°, with 6.1 in155 mm of precipitation in a typical August.
- Record high
- 103°39° (1999)
- Record low
- 59°15° (1986)
- Heating degree days
- 0
- Cooling degree days
- 510
Charleston in September
Highs average 83°28° and lows 73°23°, with 5.3 in133 mm of precipitation in a typical September.
- Record high
- 100°38° (1912)
- Record low
- 50°10° (1942)
- Heating degree days
- 1
- Cooling degree days
- 377
Charleston in OctoberThis month
Highs average 76°24° and lows 63°17°, with 4.1 in103 mm of precipitation in a typical October.
- Record high
- 95°35° (1919)
- Record low
- 37°3° (1910)
- Heating degree days
- 33
- Cooling degree days
- 169
Charleston in November
Highs average 67°19° and lows 53°12°, with 2.3 in58 mm of precipitation in a typical November.
- Record high
- 87°31° (1961)
- Record low
- 17°−8° (1950)
- Heating degree days
- 181
- Cooling degree days
- 34
Charleston in December
Highs average 61°16° and lows 47°8°, with 2.9 in74 mm of precipitation in a typical December.
- Record high
- 81°27° (1931)
- Record low
- 12°−11° (1917)
- Heating degree days
- 353
- Cooling degree days
- 7