Updated October 2026
Fort Sumter and Fort Moultrie National Historical Park Weather by Month
Fort Sumter and Fort Moultrie National Historical Park is warmest in July, when the nearest NOAA climate station averages a high of 91°F and a low of 73°F, and coldest in January, with an average high of 59°F and an average low of 37°F. August is the wettest month, with about 6.7 inches of precipitation.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 0.9 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Fort Sumter and Fort Moultrie National Historical Park can differ from these, particularly with elevation.
Warmest month
Jul
91°F avg high
Coldest month
Jan
37°F avg low
Wettest month
Aug
6.7 in avg
Longest days
Jun
14.1 h of daylight
Average weather at Fort Sumter and Fort Moultrie by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 59°F | 37°F | 3.8 in | 10.1 h |
| February | 61°F | 39°F | 3.3 in | 10.8 h |
| March | 67°F | 45°F | 3.5 in | 11.8 h |
| April | 75°F | 54°F | 3.6 in | 12.8 h |
| May | 82°F | 63°F | 3.3 in | 13.7 h |
| June | 88°F | 70°F | 5.4 in | 14.1 h |
| July | 91°F | 73°F | 6.0 in | 14.0 h |
| August | 90°F | 72°F | 6.7 in | 13.2 h |
| September | 86°F | 68°F | 5.5 in | 12.2 h |
| October | 78°F | 58°F | 3.9 in | 11.2 h |
| November | 69°F | 47°F | 3.0 in | 10.3 h |
| December | 62°F | 40°F | 3.6 in | 9.9 h |
| Year total | 51.6 in |
NOAA 1991–2020 climate normals from station USC00388405, 0.9 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Fort Sumter and Fort Moultrie is at that time of year.
Fort Sumter and Fort Moultrie weather by season
Winter: December to February
Average highs bottom out at 59°F in January, between 62°F in December and 61°F in February, with average lows between 37°F and 40°F. Together the three months average 10.7 inches of precipitation, about 21% of the yearly total. Daylight is at its shortest, about 9.9 hours in December.
Spring: March to May
Average highs climb from 67°F in March to 82°F in May, with average lows between 45°F and 63°F. Together the three months average 10.4 inches of precipitation, about 20% of the yearly total and less than in any other season. Daylight lengthens from about 11.8 hours in March to 13.7 in May.
Summer: June to August
Average highs peak at 91°F in July, between 88°F in June and 90°F in August, with average lows between 70°F and 73°F. The average high is 90°F or hotter in July and August. Together the three months average 18.1 inches of precipitation, about 35% of the yearly total and more than in any other season. Daylight is at its longest, about 14.1 hours in June.
Fall: September to November
Average highs fall from 86°F in September to 69°F in November, with average lows between 47°F and 68°F. Together the three months average 12.4 inches of precipitation, about 24% of the yearly total. Daylight shortens from about 12.2 hours in September to 10.3 in November.
What the National Park Service says about the weather
Mild winters. Hot and humid during the summer.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Fort Sumter and Fort Moultrie
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 32.76°N, 79.87°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Fort Sumter and Fort Moultrie National Historical Park →
Weather and crowds together
July is both the warmest month and the busiest, with about 1.5× the visitors of the park's average month. January is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Fort Sumter and Fort Moultrie National Historical Park. For hotels, cabins and rentals close to the park, see where to stay near Fort Sumter and Fort Moultrie.
Where to stay near Fort Sumter and Fort Moultrie
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Frequently Asked Questions
July is the warmest month at Fort Sumter and Fort Moultrie National Historical Park, with an average high of 91°F and an average low of 73°F. That is the 1991–2020 average at the nearest long-record NOAA station, 0.9 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Fort Sumter and Fort Moultrie National Historical Park, with an average low of 37°F and an average high of 59°F, based on NOAA 1991–2020 climate normals.
August is the wettest month, with about 6.7 inches of precipitation. November is the driest, at about 3 inches. The station records about 51.6 inches of precipitation in an average year.
Daylight at Fort Sumter and Fort Moultrie National Historical Park runs from about 9.9 hours a day in December to about 14.1 hours in June, computed from the park's latitude.
Weather at nearby parks
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Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00388405), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1979–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.