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Monthly climate in Charleston, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Charleston features a humid subtropical climate (Cfa).Temperatures typically range between 2 °C (37 °F) and 25 °C (77 °F) through the year, but rarely can drop to -17 °C (2 °F) or can rise to as high as 36 °C (96 °F).The average annual precipitation amounts to about 1481 mm (58.3 inches) and receives 155 rainy days on the 1 mm (0.04 inches) threshold annually.Charleston enjoys an average of 2901 hours of sunshine throughout the year, and daylight varies from 9 hours 31 minutes to 14 hours 46 minutes per day.

Monthly average temperatures in Charleston, United States §

The warmest months in Charleston are June, July and August, with daily mean temperatures ranging from 22 to 25 °C (72 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 5 °C (37 - 42 °F) throughout the day. On average each year, Charleston experiences 114 days above 25 °C (77.0 °F) and 60 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Charleston, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 24°C
(75°F)		 27°C
(81°F)		 29°C
(84°F)		 31°C
(88°F)		 32°C
(90°F)		 34°C
(93°F)		 34°C
(94°F)		 34°C
(93°F)		 36°C
(96°F)		 35°C
(95°F)		 27°C
(81°F)		 21°C
(70°F)
Mean maximum 19°C
(67°F)		 23°C
(74°F)		 26°C
(79°F)		 29°C
(85°F)		 31°C
(88°F)		 33°C
(91°F)		 33°C
(92°F)		 32°C
(90°F)		 32°C
(90°F)		 30°C
(87°F)		 24°C
(76°F)		 20°C
(67°F)
Average high 7°C
(44°F)		 10°C
(51°F)		 14°C
(57°F)		 19°C
(67°F)		 24°C
(75°F)		 27°C
(81°F)		 30°C
(86°F)		 28°C
(83°F)		 27°C
(80°F)		 21°C
(71°F)		 13°C
(56°F)		 10°C
(50°F)
Daily mean 2°C
(37°F)		 5°C
(42°F)		 9°C
(48°F)		 13°C
(56°F)		 19°C
(66°F)		 22°C
(72°F)		 25°C
(77°F)		 23°C
(74°F)		 21°C
(70°F)		 16°C
(61°F)		 8°C
(46°F)		 5°C
(41°F)
Average low -1°C
(30°F)		 1°C
(34°F)		 4°C
(39°F)		 8°C
(47°F)		 14°C
(58°F)		 18°C
(64°F)		 20°C
(69°F)		 19°C
(67°F)		 17°C
(62°F)		 11°C
(52°F)		 3°C
(38°F)		 1°C
(34°F)
Mean minimum -14°C
(8°F)		 -10°C
(13°F)		 -7°C
(20°F)		 -2°C
(29°F)		 5°C
(40°F)		 12°C
(54°F)		 15°C
(59°F)		 14°C
(58°F)		 10°C
(50°F)		 2°C
(36°F)		 -5°C
(23°F)		 -9°C
(16°F)
Minimum -17°C
(2°F)		 -17°C
(2°F)		 -12°C
(12°F)		 -4°C
(26°F)		 1°C
(34°F)		 8°C
(46°F)		 13°C
(56°F)		 13°C
(55°F)		 7°C
(45°F)		 -1°C
(31°F)		 -10°C
(15°F)		 -13°C
(8°F)

Compare climate in Charleston with other places

Compare temperature, precipitation, sunshine, UV index in Charleston, United States with other places around the world.

Monthly average precipitation in Charleston, United States §

Charleston usually has the most precipitation in February, May and June, with an average of 16 rainy days and 155 mm (6.1 inches) of precipitation per month.The driest months in Charleston are January, September and November. On average, 94 mm (3.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Charleston, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 101 (4.0) 152 (6.0) 119 (4.7) 134 (5.3) 159 (6.3) 154 (6.1) 124 (4.9) 114 (4.5) 103 (4.0) 117 (4.6) 78 (3.1) 124 (4.9)
Average precipitation days (≥ 1 mm) 12 15 13 14 17 16 13 15 8 11 9 12

Monthly sunshine hours in Charleston, United States §

The sunniest months in Charleston are June, July and August, when the sun shines an average of 10 hours 32 minutes a day.Least sunny months in Charleston: January, February and December receive an average of 4 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Charleston, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 120 145 234 242 293 308 345 315 286 248 203 157
Mean daily daylight hours 9h 49m 10h 46m 11h 58m 13h 13m 14h 16m 14h 46m 14h 30m 13h 34m 12h 22m 11h 8m 10h 4m 9h 31m

Solar UV radiation in Charleston, United States §

Charleston experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 10 - 10, which corresponds to the Very High category of sun exposure.January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Charleston UV Index data.

Average daily maximum UV levels by month for Charleston, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 7 9 10 10 10 10 8 7 5 3