Updated October 2026
Assateague Island National Seashore Weather by Month
Assateague Island National Seashore is warmest in July, when the nearest NOAA climate station averages a high of 86°F and a low of 68°F, and coldest in January, with an average high of 47°F and an average low of 31°F. September is the wettest month, with about 4.5 inches of precipitation. Snowfall is heaviest in January, at about 1.8 inches.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 2.1 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Assateague Island National Seashore can differ from these, particularly with elevation.
Warmest month
Jul
86°F avg high
Coldest month
Jan
31°F avg low
Wettest month
Sep
4.5 in avg
Snowiest month
Jan
1.8 in avg
Longest days
Jun
14.6 h of daylight
Average weather at Assateague Island by month
| Month | Avg high | Avg low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 47°F | 31°F | 3.4 in | 1.8 in | 9.6 h |
| February | 48°F | 33°F | 3.3 in | 1.0 in | 10.6 h |
| March | 54°F | 37°F | 4.2 in | 0.4 in | 11.7 h |
| April | 63°F | 45°F | 3.4 in | 0.0 in | 13.0 h |
| May | 72°F | 54°F | 3.2 in | 0.0 in | 14.1 h |
| June | 81°F | 63°F | 3.5 in | 0.0 in | 14.6 h |
| July | 86°F | 68°F | 4.2 in | 0.0 in | 14.4 h |
| August | 85°F | 68°F | 4.2 in | 0.0 in | 13.5 h |
| September | 80°F | 64°F | 4.5 in | 0.0 in | 12.2 h |
| October | 72°F | 53°F | 3.9 in | 0.0 in | 11.0 h |
| November | 60°F | 42°F | 3.0 in | 0.0 in | 9.9 h |
| December | 52°F | 35°F | 4.0 in | 0.2 in | 9.4 h |
| Year total | 44.8 in | 3.4 in |
NOAA 1991–2020 climate normals from station USC00180335, 2.1 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Assateague Island is at that time of year.
Assateague Island weather by season
Winter: December to February
Average highs bottom out at 47°F in January, between 52°F in December and 48°F in February, with average lows between 31°F and 35°F. The average low is at or below freezing in January. Together the three months average 10.7 inches of precipitation, about 24% of the yearly total and less than in any other season. Snowfall averages about 3 inches for the season, most of it in January. Daylight is at its shortest, about 9.4 hours in December.
Spring: March to May
Average highs climb from 54°F in March to 72°F in May, with average lows between 37°F and 54°F. Together the three months average 10.8 inches of precipitation, about 24% of the yearly total. Snowfall averages about 0.4 inches for the season. Daylight lengthens from about 11.7 hours in March to 14.1 in May.
Summer: June to August
Average highs peak at 86°F in July, between 81°F in June and 85°F in August, with average lows between 63°F and 68°F. Together the three months average 11.9 inches of precipitation, about 27% of the yearly total and more than in any other season. Daylight is at its longest, about 14.6 hours in June.
Fall: September to November
Average highs fall from 80°F in September to 60°F in November, with average lows between 42°F and 64°F. Together the three months average 11.4 inches of precipitation, about 25% of the yearly total. Daylight shortens from about 12.2 hours in September to 9.9 in November.
What the National Park Service says about the weather
Spring: Often windy and cool with lows in the 40's and highs in the 60's. Summer: Hot and humid with lows in the 60's and highs in the 80's. Fall: Warm with lows in the 50's and highs in the 70's. Winter: Damp cold and often windy. Lows in the 20's, highs in the 40's.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Assateague 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 38.06°N, 75.25°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 Assateague Island National Seashore →
Weather and crowds together
July is both the warmest month and the busiest, with about 2.5× the visitors of the park's average month. December is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Assateague Island National Seashore. For hotels, cabins and rentals close to the park, see where to stay near Assateague Island.
Where to stay near Assateague Island
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Top-rated places to stay near Assateague Island
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Frequently Asked Questions
July is the warmest month at Assateague Island National Seashore, with an average high of 86°F and an average low of 68°F. That is the 1991–2020 average at the nearest long-record NOAA station, 2.1 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Assateague Island National Seashore, with an average low of 31°F and an average high of 47°F, based on NOAA 1991–2020 climate normals.
September is the wettest month, with about 4.5 inches of precipitation. November is the driest, at about 3 inches. The station records about 44.8 inches of precipitation in an average year.
Yes. The nearest long-record NOAA station, 2.1 miles from the park's reference point, averages about 3.4 inches of snow a year. January is the snowiest month, at about 1.8 inches. The station averages at least a tenth of an inch of snow in 4 of the 12 months.
Weather at nearby parks
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Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00180335), 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.