Updated October 2026
Prince William Forest Park Weather by Month
Prince William Forest Park is warmest in July, when the nearest NOAA climate station averages a high of 88°F and a low of 71°F, and coldest in January, with an average high of 45°F and an average low of 28°F. July is the wettest month, with about 4.6 inches of precipitation. Snowfall is heaviest in February, at about 5.8 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, 7.3 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Prince William Forest Park can differ from these, particularly with elevation.
Warmest month
Jul
88°F avg high
Coldest month
Jan
28°F avg low
Wettest month
Jul
4.6 in avg
Snowiest month
Feb
5.8 in avg
Longest days
Jun
14.7 h of daylight
Average weather at Prince William Forest by month
| Month | Avg high | Avg low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 45°F | 28°F | 2.7 in | 3.5 in | 9.6 h |
| February | 48°F | 30°F | 2.4 in | 5.8 in | 10.6 h |
| March | 56°F | 37°F | 3.6 in | 1.4 in | 11.7 h |
| April | 68°F | 47°F | 3.2 in | 0.0 in | 13.0 h |
| May | 76°F | 57°F | 3.6 in | 0.0 in | 14.1 h |
| June | 84°F | 66°F | 3.5 in | 0.0 in | 14.7 h |
| July | 88°F | 71°F | 4.6 in | 0.0 in | 14.4 h |
| August | 86°F | 69°F | 4.2 in | 0.0 in | 13.5 h |
| September | 80°F | 62°F | 3.4 in | 0.0 in | 12.2 h |
| October | 69°F | 50°F | 3.3 in | 0.0 in | 11.0 h |
| November | 58°F | 39°F | 3.1 in | 0.0 in | 9.9 h |
| December | 49°F | 32°F | 3.3 in | 1.7 in | 9.3 h |
| Year total | 40.9 in | 12.4 in |
NOAA 1991–2020 climate normals from station USW00013773, 7.3 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Prince William Forest is at that time of year.
Prince William Forest weather by season
Winter: December to February
Average highs bottom out at 45°F in January, between 49°F in December and 48°F in February, with average lows between 28°F and 32°F. The average low is at or below freezing in all three months. Together the three months average 8.4 inches of precipitation, about 21% of the yearly total and less than in any other season. Snowfall averages about 11 inches for the season. Daylight is at its shortest, about 9.3 hours in December.
Spring: March to May
Average highs climb from 56°F in March to 76°F in May, with average lows between 37°F and 57°F. Together the three months average 10.4 inches of precipitation, about 25% of the yearly total. Snowfall averages about 1.4 inches for the season, most of it in March. Daylight lengthens from about 11.7 hours in March to 14.1 in May.
Summer: June to August
Average highs peak at 88°F in July, between 84°F in June and 86°F in August, with average lows between 66°F and 71°F. Together the three months average 12.3 inches of precipitation, about 30% of the yearly total and more than in any other season. Daylight is at its longest, about 14.7 hours in June.
Fall: September to November
Average highs fall from 80°F in September to 58°F in November, with average lows between 39°F and 62°F. Together the three months average 9.8 inches of precipitation, about 24% 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
Prince William Forest Park experiences all four seasons. Spring and fall are generally comfortable with precipitation possible. Summers can be hot and humid with average temperatures in the high 80s and with sudden thunderstorms possible. July and August are the hottest months. Winters can be cold with average temperatures in the winter of 41 degrees with variable precipitation. The main park roads can close due to snowy conditions, though cross-country skiing and snow-shoeing are permitted.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Prince William Forest
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 38.59°N, 77.39°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 Prince William Forest Park →
Weather and crowds together
July is both the warmest month and the busiest, with about 1.3× 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 Prince William Forest Park. For hotels, cabins and rentals close to the park, see where to stay near Prince William Forest.
Where to stay near Prince William Forest
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Top-rated places to stay near Prince William Forest
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Frequently Asked Questions
July is the warmest month at Prince William Forest Park, with an average high of 88°F and an average low of 71°F. That is the 1991–2020 average at the nearest long-record NOAA station, 7.3 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Prince William Forest Park, with an average low of 28°F and an average high of 45°F, based on NOAA 1991–2020 climate normals.
July is the wettest month, with about 4.6 inches of precipitation. February is the driest, at about 2.4 inches. The station records about 40.9 inches of precipitation in an average year.
Yes. The nearest long-record NOAA station, 7.3 miles from the park's reference point, averages about 12 inches of snow a year. February is the snowiest month, at about 5.8 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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19 mi away · warmest in July (88°F)
19 mi away · warmest in July (88°F)
21 mi away · warmest in July (89°F)
21 mi away · warmest in July (88°F)
25 mi away · warmest in July (84°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00013773), 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.