Updated October 2026
Cumberland Island National Seashore Weather by Month
Cumberland Island National Seashore is warmest in July, when the nearest NOAA climate station averages a high of 89°F and a low of 74°F, and coldest in January, with an average high of 62°F and an average low of 43°F. August is the wettest month, with about 6.5 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, 3.5 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Cumberland Island National Seashore can differ from these, particularly with elevation.
Warmest month
Jul
89°F avg high
Coldest month
Jan
43°F avg low
Wettest month
Aug
6.5 in avg
Longest days
Jun
14.0 h of daylight
Average weather at Cumberland Island by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 62°F | 43°F | 2.8 in | 10.2 h |
| February | 65°F | 45°F | 2.8 in | 10.9 h |
| March | 70°F | 51°F | 3.3 in | 11.8 h |
| April | 76°F | 57°F | 2.8 in | 12.8 h |
| May | 82°F | 65°F | 3.7 in | 13.6 h |
| June | 86°F | 71°F | 6.3 in | 14.0 h |
| July | 89°F | 74°F | 4.6 in | 13.8 h |
| August | 89°F | 74°F | 6.5 in | 13.1 h |
| September | 85°F | 71°F | 5.2 in | 12.2 h |
| October | 79°F | 62°F | 4.4 in | 11.2 h |
| November | 71°F | 52°F | 1.7 in | 10.4 h |
| December | 65°F | 46°F | 3.1 in | 10.0 h |
| Year total | 47.2 in |
NOAA 1991–2020 climate normals from station USW00063856, 3.5 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Cumberland Island is at that time of year.
Cumberland Island weather by season
Winter: December to February
Average highs bottom out at 62°F in January, between 65°F in December and 65°F in February, with average lows between 43°F and 46°F. Together the three months average 8.7 inches of precipitation, about 18% of the yearly total and less than in any other season. Daylight is at its shortest, about 10.0 hours in December.
Spring: March to May
Average highs climb from 70°F in March to 82°F in May, with average lows between 51°F and 65°F. Together the three months average 9.8 inches of precipitation, about 21% of the yearly total. Daylight lengthens from about 11.8 hours in March to 13.6 in May.
Summer: June to August
Average highs climb from 86°F in June to 89°F in August, with average lows between 71°F and 74°F. Together the three months average 17.4 inches of precipitation, about 37% of the yearly total and more than in any other season. Daylight is at its longest, about 14.0 hours in June.
Fall: September to November
Average highs fall from 85°F in September to 71°F in November, with average lows between 52°F and 71°F. Together the three months average 11.3 inches of precipitation, about 24% of the yearly total. Daylight shortens from about 12.2 hours in September to 10.4 in November.
What the National Park Service says about the weather
Cumberland Island’s climate is hot and humid during summer when temperatures tend to be in the 80's (>26 C) and mild during winter when temperatures tend to be in the 60's (<20 C). The warmest month of the year is July with an average high of 90 degrees F (32 C), while the coldest is January with an average low of 45 degrees F (44 C). Visit the Current Conditions page for an up-to-date local forecast: https://www.nps.gov/cuis/planyourvisit/conditions.htm#weather
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Cumberland Island
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 30.86°N, 81.45°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 Cumberland Island National Seashore →
Weather and crowds together
July, the warmest month, sees about 1.3× the visitors of the park's average month. March is the busiest month of the year and January the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Cumberland Island National Seashore. For hotels, cabins and rentals close to the park, see where to stay near Cumberland Island.
Where to stay near Cumberland Island
Picked a month for Cumberland Island National Seashore? Compare hotels, cabins and vacation rentals near the park with live availability and prices.
Top-rated places to stay near Cumberland Island
Prices for Oct 16–18, 4 adults. Change dates on the map below.
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Frequently Asked Questions
July is the warmest month at Cumberland Island National Seashore, with an average high of 89°F and an average low of 74°F. That is the 1991–2020 average at the nearest long-record NOAA station, 3.5 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Cumberland Island National Seashore, with an average low of 43°F and an average high of 62°F, based on NOAA 1991–2020 climate normals.
August is the wettest month, with about 6.5 inches of precipitation. November is the driest, at about 1.7 inches. The station records about 47.2 inches of precipitation in an average year.
Daylight at Cumberland Island National Seashore runs from about 10.0 hours a day in December to about 14.0 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 USW00063856), 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.