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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 33°C, while the coldest is January averaging around 3°C at night. Around 1311 mm of precipitation falls each year, peaking in August (171 mm) and easing off in November (76 mm).

☀️ Summers

Hot

Highs near 33°C in July.

About 47 days a year above 32 °C

❄️ Winters

Chilly

Lows near 3°C in January.

About 15 freezing nights a year

🌧️ Rain

Wet

About 1311 mm of rain a year.

Wettest in August

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

−0.3 °C 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 (°C)	15	16	20	24	28	31	33	32	30	26	21	17
Avg temp (°C)	9	10	13	18	23	26	28	27	25	20	15	11
Avg low (°C)	3	4	7	12	17	21	23	22	20	14	8	4
Precipitation (mm)	97	84	89	91	85	136	152	171	139	100	76	92

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	15	16	20	24	28	31
Avg temp (°C)	9	10	13	18	23	26
Avg low (°C)	3	4	7	12	17	21
Precipitation (mm)	97	84	89	91	85	136

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	32	30	26	21	17
Avg temp (°C)	28	27	25	20	15	11
Avg low (°C)	23	22	20	14	8	4
Precipitation (mm)	152	171	139	100	76	92

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 ≥ 32°C (days)	—	—	—	0.3	2	9	17	13	5	0.5	—	—
Days with low ≤ 0°C (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 ≥ 32°C (days)	—	—	—	0.3	2	9
Days with low ≤ 0°C (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 ≥ 32°C (days)	17	13	5	0.5	—	—
Days with low ≤ 0°C (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 →