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Monthly climate in Charleston, South Carolina, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Charleston features a humid subtropical climate (Cfa).Temperatures typically range between 11 °C (52 °F) and 28 °C (82 °F) through the year, but rarely can drop to -13 °C (9 °F) or can rise to as high as 37 °C (98 °F).The average annual precipitation amounts to about 1379 mm (54.3 inches) and receives 139 rainy days on the 1 mm (0.04 inches) threshold annually.Charleston enjoys an average of 3337 hours of sunshine throughout the year, and daylight varies from 10 hours 0 minutes to 14 hours 16 minutes per day.

Monthly average temperatures in Charleston, South Carolina, United States §

The warmest months in Charleston are June, July and August, with daily mean temperatures ranging from 26 to 28 °C (79 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 11 to 14 °C (52 - 57 °F) throughout the day. On average each year, Charleston experiences 158 days above 25 °C (77.0 °F) and 5 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, South Carolina, 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 26°C
(79°F)		 26°C
(79°F)		 28°C
(82°F)		 31°C
(89°F)		 37°C
(98°F)		 35°C
(95°F)		 34°C
(94°F)		 35°C
(95°F)		 35°C
(94°F)		 31°C
(89°F)		 28°C
(84°F)		 25°C
(77°F)
Mean maximum 24°C
(75°F)		 25°C
(77°F)		 26°C
(80°F)		 29°C
(84°F)		 33°C
(91°F)		 33°C
(91°F)		 33°C
(92°F)		 34°C
(93°F)		 33°C
(91°F)		 31°C
(87°F)		 27°C
(81°F)		 23°C
(74°F)
Average high 15°C
(60°F)		 18°C
(65°F)		 20°C
(69°F)		 23°C
(74°F)		 27°C
(81°F)		 29°C
(85°F)		 31°C
(88°F)		 31°C
(87°F)		 29°C
(85°F)		 26°C
(79°F)		 20°C
(68°F)		 17°C
(63°F)
Daily mean 11°C
(52°F)		 14°C
(57°F)		 15°C
(60°F)		 19°C
(66°F)		 23°C
(74°F)		 26°C
(79°F)		 28°C
(82°F)		 27°C
(81°F)		 26°C
(78°F)		 22°C
(72°F)		 15°C
(59°F)		 12°C
(54°F)
Average low 7°C
(44°F)		 9°C
(49°F)		 11°C
(52°F)		 15°C
(59°F)		 20°C
(68°F)		 23°C
(74°F)		 25°C
(77°F)		 25°C
(77°F)		 23°C
(73°F)		 18°C
(65°F)		 10°C
(51°F)		 8°C
(47°F)
Mean minimum -3°C
(26°F)		 1°C
(33°F)		 0°C
(33°F)		 6°C
(43°F)		 12°C
(53°F)		 18°C
(65°F)		 21°C
(71°F)		 22°C
(72°F)		 17°C
(63°F)		 9°C
(49°F)		 2°C
(36°F)		 0°C
(33°F)
Minimum -13°C
(9°F)		 -2°C
(29°F)		 -1°C
(30°F)		 4°C
(39°F)		 9°C
(49°F)		 16°C
(61°F)		 20°C
(69°F)		 21°C
(70°F)		 14°C
(57°F)		 3°C
(38°F)		 -1°C
(31°F)		 -3°C
(28°F)

Compare climate in Charleston with other places

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

Monthly average precipitation in Charleston, South Carolina, United States §

Charleston usually has the most precipitation in July, August and September, with an average of 18 rainy days and 182 mm (7.2 inches) of precipitation per month.The driest months in Charleston are January, February and March. On average, 66 mm (2.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Charleston, South Carolina, 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) 59 (2.3) 78 (3.1) 60 (2.4) 101 (4.0) 87 (3.4) 150 (5.9) 187 (7.4) 183 (7.2) 176 (6.9) 79 (3.1) 92 (3.6) 127 (5.0)
Average precipitation days (≥ 1 mm) 7 9 6 8 9 19 20 21 14 9 8 9

Monthly sunshine hours in Charleston, South Carolina, United States §

The sunniest months in Charleston are May, June and July, when the sun shines an average of 10 hours 47 minutes a day.Least sunny months in Charleston: January, February and December receive an average of 6 hours 46 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Charleston, South Carolina, 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 186 212 274 305 336 316 340 313 299 287 247 217
Mean daily daylight hours 10h 14m 11h 0m 11h 59m 13h 0m 13h 51m 14h 16m 14h 2m 13h 17m 12h 19m 11h 19m 10h 26m 10h 0m

Solar UV radiation in Charleston, South Carolina, 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 11 - 11, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Charleston UV Index data.

Average daily maximum UV levels by month for Charleston, South Carolina, 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) 4 7 9 10 11 11 11 11 9 8 6 4