Charleston SC Average Temperatures 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

Charleston Temperatures: Averages by Month

Days of Hot Weather in Charleston

How Often Charleston Has Cold Temperatures

References

More on Weather in South Carolina