Charleston Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Charleston, South Carolina during each month of the year.

The average high and low temperatures are listed below monthly and annually for Charleston, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in the city, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1981 to 2010 weather.

10-year temperature averages for Charleston, 2010 to 2019
High °F Low °F   High °C Low °C
60 38 January 16 3
65 43 February 18 6
70 47 March 21 8
78 56 April 26 13
85 65 May 29 18
90 72 June 32 22
92 74 July 33 24
90 74 August 32 23
87 70 September 31 21
79 59 October 26 15
69 46 November 21 8
64 44 December 18 7
78 57 Year 25 14
30-year temperature averages for Charleston, 1981 to 2010
High °F Low °F   High °C Low °C
59 38 January 15 3
63 41 February 17 5
70 47 March 21 8
76 53 April 25 12
83 62 May 28 17
88 70 June 31 21
91 73 July 33 23
90 72 August 32 22
85 67 September 29 20
77 57 October 25 14
70 48 November 21 9
62 40 December 16 5
76 56 Year 25 13

Days of Hot Weather in Charleston

Days with temperatures peaking in the 90s F are common at Charleston from May to September. But the thermometer rarely reaches 100 degrees (38 °C). While days that hot are possible during June, July and August, that kind of heat does not happen every year.

Days per month in Charleston of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 5 0 0
February 7 1 0
March 7 4 0
April 24 10 1
May 30 23 4
June 30 28 12
July 31 31 19
August 31 30 15
September 30 25 5
October 26 12 0
November 16 3 0
December 7 1 0
Year 253 166 55

How Often Charleston Has Cold Temperatures

From November to March in Charleston, some nights can turn frosty. The coldest nights in December, January or February get down to 20 °F (-8 °C) or below. Only one or two nights a year on average have temperatures that chilly.

Days per month on average in Charleston when the minimum temperature drops to 32, 40, or 50 °F or below
  32 °F
0 °C
40 °F
4 °C
50 °F
10 °C
January 10 19 27
February 5 14 23
March 2 8 20
April 0 2 10
May 0 0 2
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 1 7
November 1 7 17
December 7 16 25
Year 24 67 132
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information. 1981-2010 U.S. Climate Normals. (Data Access. FTP.)

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