Mount Pleasant, South Carolina climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Mount Pleasant's center at January lows of 41°F and July highs of 90°F, a yearly mean of 66.6°F and 49.6 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Sullivan's Island (3 miles S, 5 ft), has January lows of 37°F and July highs of 91°F.
95,604 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 59° 41°
- Feb 62° 43°
- Mar 68° 49°
- Apr 75° 56°
- May 81° 65°
- Jun 87° 72°
- Jul 90° 75°
- Aug 89° 74°
- Sep 84° 70°
- Oct 77° 60°
- Nov 68° 50°
- Dec 62° 44°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
The months above are NOAA's gridded normals at Mount Pleasant's center.
What is each month like in Mount Pleasant?
NOAA's grid estimates the normals every 5 km or so from the stations around each point, terrain included. It smooths between stations, so night lows at the heart of a large city can run warmer than the grid shows: at five big-city airports we compared, the grid's highs were within about 1°F of the station and its lows 1-6°F cooler. The nearest record's high and low are beside each month.
| Month | High | Low | Mean | Precip. | Sullivan's Island high | Sullivan's Island low |
|---|---|---|---|---|---|---|
| January | 59°F | 41°F | 49.9°F | 3.29 | 59°F | 37°F |
| February | 62°F | 43°F | 52.4°F | 3.06 | 61°F | 39°F |
| March | 68°F | 49°F | 58.3°F | 3.35 | 67°F | 45°F |
| April | 75°F | 56°F | 65.3°F | 3.25 | 75°F | 54°F |
| May | 81°F | 65°F | 73.0°F | 3.14 | 82°F | 63°F |
| June | 87°F | 72°F | 79.3°F | 5.40 | 88°F | 70°F |
| July | 90°F | 75°F | 82.5°F | 5.87 | 91°F | 73°F |
| August | 89°F | 74°F | 81.5°F | 6.43 | 90°F | 72°F |
| September | 84°F | 70°F | 77.1°F | 5.42 | 86°F | 68°F |
| October | 77°F | 60°F | 68.5°F | 4.45 | 78°F | 58°F |
| November | 68°F | 50°F | 58.9°F | 2.83 | 69°F | 47°F |
| December | 62°F | 44°F | 52.8°F | 3.14 | 62°F | 40°F |
In metric: a yearly mean of 19.2°C, January lows of 5°C, July highs of 32°C and 1,261 mm of precipitation a year.
Source: NOAA NCEI U.S. Monthly Gridded Climate Normals 1991-2020 (nClimGrid, accession 0245564); NOAA NCEI 1991-2020 station normals. The grid cell holding the city's Census center point.
What do the station records around Mount Pleasant say?
Each row is a NOAA station's own 1991-2020 normals, with the snow and frost dates the grid does not give. A record downhill or nearer the coast than the city can run warmer, one uphill cooler: compare the elevations.
| Record | Where | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Sullivan's IslandSullivans Island | 3 mi S | 5 ft | 65.5°F | 37°F | 91°F | 51.6 | – | March 13 |
| Charleston City | 4 mi SW | 10 ft | 67.2°F | 44°F | 88°F | 44.3 | – | February 4 |
| CharlestonCharleston International Airport | 12 mi NW | 40 ft | 66.5°F | 39°F | 91°F | 52.5 | 0 | March 7 |
Source: NOAA NCEI 1991-2020 U.S. Climate Normals; place center and population: Census Bureau 2024. Last frost: the median last spring date of 32°F.
How much snow, how late a frost, what zone and how much sun in Mount Pleasant?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Sullivan's Island (3 miles S, 5 ft). NOAA publishes no snowfall normal for it; the nearest record that has one, Charleston (12 miles NW), gets 0 inches a year. The last spring frost (32°F) comes after March 13 in half of years and the first autumn frost before November 30.
The USDA's 2023 Plant Hardiness Zone Map puts Mount Pleasant in zone 9a across its 2 ZIP code areas.
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (4.7 kWh per square metre a day, NASA POWER 2001-2020); May is the sunniest month (85%) and February the cloudiest (73%).
Sullivan's Island's page has its months, frost probabilities, records by month and recent years. NOAA's grid has monthly figures only, so there are no day-by-day month pages for Mount Pleasant; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USC00388405; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; sunshine: NASA POWER.
How does the climate vary across Mount Pleasant, ZIP code by ZIP code?
2 ZIP code areas lie wholly or partly in Mount Pleasant. On NOAA's grid 29464 is the warmest (66.6°F a year) and 29466 the coolest (66.6°F), so the city is nearly uniform. Each row also names the nearest station record and its frost dates.
| ZIP code | Zone | Year | Jan low | Jul high | Precip. | Nearest record | Last frost | First frost |
|---|---|---|---|---|---|---|---|---|
| 29464 | 9a | 66.6°F | 41°F | 90°F | 49.6 | Sullivan's Island (4 mi) | March 13 | November 30 |
| 29466 | 9a | 66.6°F | 41°F | 90°F | 50.5 | Sullivan's Island (9 mi) | March 13 | November 30 |
Source: Census Bureau 2020 ZCTA-to-place relationship file and ZCTA centers; NOAA NCEI gridded and station normals, 1991-2020. A ZIP area counts when at least a tenth of its land (and 0.5 km²) is in the city; its figures are the grid cell at its center; frost dates are the nearest record's medians of 32°F.