Home › Cities › United States › South Carolina › Mount Pleasant

Mount Pleasant, South Carolina climate

Cfa Humid subtropical

Mount Pleasant has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 91°F, while the coldest is January averaging around 37°F at night. Around 52 inches of precipitation falls each year, peaking in August (6.7 inches) and easing off in November (3.0 inches).

☀️ Summers

Hot

Highs near 91°F in July.

About 47 days a year above 90 °F

❄️ Winters

Chilly

Lows near 37°F in January.

About 15 freezing nights a year

🌧️ Rain

Wet

About 52 in of rain a year.

Wettest in August

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

−0.6 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Mount Pleasant climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	59	61	67	75	82	88	91	90	86	78	69	62
Avg temp (°F)	48	50	56	64	73	79	82	81	77	68	58	51
Avg low (°F)	37	39	45	54	63	70	73	72	68	58	47	40
Precipitation (in)	3.8	3.3	3.5	3.6	3.3	5.4	6.0	6.7	5.5	3.9	3.0	3.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	59	61	67	75	82	88
Avg temp (°F)	48	50	56	64	73	79
Avg low (°F)	37	39	45	54	63	70
Precipitation (in)	3.8	3.3	3.5	3.6	3.3	5.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	91	90	86	78	69	62
Avg temp (°F)	82	81	77	68	58	51
Avg low (°F)	73	72	68	58	47	40
Precipitation (in)	6.0	6.7	5.5	3.9	3.0	3.6

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	8	8	7	6	9	11	10	8	7	8	8
Days with high ≥ 90°F (days)	—	—	—	0.3	2	9	17	13	5	0.5	—	—
Days with low ≤ 32°F (days)	6	4	1	0.1	—	—	—	—	—	0.1	0.6	3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	9	8	8	7	6	9
Days with high ≥ 90°F (days)	—	—	—	0.3	2	9
Days with low ≤ 32°F (days)	6	4	1	0.1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	10	8	7	8	8
Days with high ≥ 90°F (days)	17	13	5	0.5	—	—
Days with low ≤ 32°F (days)	—	—	—	0.1	0.6	3

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	68	70	60	49	50	57	57	59	58	51	56	66
Clear days (≤ 30% cloud)	4	3	7	11	10	7	7	6	7	11	9	5
Partly cloudy days (30–70%)	11	9	11	10	11	12	13	12	10	8	9	10
Cloudy days (≥ 70%)	17	16	13	10	10	12	11	13	12	11	12	16
Relative humidity (%)	81	81	78	75	73	76	77	79	80	79	79	82
Wind speed (mph)	3.4	3.4	3.4	3.2	3.0	2.8	2.7	2.6	2.9	3.0	3.0	3.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	68	70	60	49	50	57
Clear days (≤ 30% cloud)	4	3	7	11	10	7
Partly cloudy days (30–70%)	11	9	11	10	11	12
Cloudy days (≥ 70%)	17	16	13	10	10	12
Relative humidity (%)	81	81	78	75	73	76
Wind speed (mph)	3.4	3.4	3.4	3.2	3.0	2.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	59	58	51	56	66
Clear days (≤ 30% cloud)	7	6	7	11	9	5
Partly cloudy days (30–70%)	13	12	10	8	9	10
Cloudy days (≥ 70%)	11	13	12	11	12	16
Relative humidity (%)	77	79	80	79	79	82
Wind speed (mph)	2.7	2.6	2.9	3.0	3.0	3.1

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Sullivans IS (NOAA GHCN station USC00388405), about 4 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →