Charleston Intl climate by month
Averages and records for each calendar month at Charleston Intl, United States, from 1937 to 2026. The warmest month is July, averaging 32.4°C; the coolest is January at 15.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 15.3°C | 3.3°C | 28.3°C16 January 1950 | −14.4°C21 January 1985 | 89 / 89 |
| February | 17.1°C | 4.7°C | 30.6°C16 February 1989 | −11.1°C12 February 1973 | 89 / 89 |
| March | 20.8°C | 8.2°C | 32.2°C18 March 1963 | −9.4°C3 March 1980 | 90 / 90 |
| April | 24.8°C | 12.0°C | 35.0°C20 April 2002 | −1.7°C6 April 1944 | 90 / 90 |
| May | 28.5°C | 16.7°C | 38.3°C28 May 2019 | 2.2°C2 May 1963 | 90 / 90 |
| June | 31.2°C | 20.8°C | 39.4°C24 June 1944 | 10.0°C2 June 1972 | 90 / 90 |
| July | 32.4°C | 22.6°C | 40.0°C19 July 1986 | 14.4°C5 July 1952 | 90 / 90 |
| August | 31.8°C | 22.3°C | 40.6°C1 August 1999 | 13.3°C18 August 1979 | 90 / 90 |
| September | 29.5°C | 19.6°C | 37.2°C4 September 1944 | 5.6°C30 September 1967 | 89 / 90 |
| October | 25.2°C | 13.5°C | 34.4°C5 October 1954 | −2.8°C30 October 1952 | 89 / 89 |
| November | 20.7°C | 7.9°C | 31.1°C1 November 1961 | −9.4°C25 November 1950 | 89 / 89 |
| December | 16.6°C | 4.5°C | 28.3°C11 December 1972 | −13.3°C13 December 1962 | 89 / 89 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 89 to 90 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.