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 1991 to 2020 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, 1991 to 2020
High °F Low °F   High °C Low °C
60 39 January 16 4
64 42 February 18 5
70 47 March 21 9
77 55 April 25 13
84 63 May 29 17
89 70 June 31 21
91 74 July 33 23
90 73 August 32 23
85 68 September 30 20
78 58 October 26 14
69 47 November 21 8
63 42 December 17 5
77 56 Year 25 14

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 seldom reaches 100 degrees (38 °C), occurring on average once a 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 7 0 0
February 9 1 0
March 18 5 0
April 26 12 1
May 31 24 5
June 30 29 14
July 31 31 21
August 31 30 17
September 30 26 6
October 27 15 1
November 16 3 0
December 8 1 0
Year 262 178 64

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 night a year on average has temperatures that chilly. No matter how cold at night, during the day Charleston warms to above freezing.

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 9 18 26
February 4 13 23
March 2 8 19
April 0 1 9
May 0 0 1
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 1 7
November 1 8 19
December 6 15 25
Year 22 63 129
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 (NCEI). Climate Normals.

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