Updated October 2026
Fort Vancouver National Historic Site Weather by Month
Fort Vancouver National Historic Site is warmest in August, when the nearest NOAA climate station averages a high of 82°F and a low of 57°F, and coldest in January, with an average high of 47°F and an average low of 34°F. December is the wettest month, with about 6.1 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, 0.4 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Fort Vancouver National Historic Site can differ from these, particularly with elevation.
Warmest month
Aug
82°F avg high
Coldest month
Jan
34°F avg low
Wettest month
Dec
6.1 in avg
Longest days
Jun
15.5 h of daylight
Average weather at Fort Vancouver by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 47°F | 34°F | 5.3 in | 8.9 h |
| February | 51°F | 35°F | 3.8 in | 10.1 h |
| March | 56°F | 38°F | 4.0 in | 11.6 h |
| April | 61°F | 42°F | 2.9 in | 13.3 h |
| May | 68°F | 48°F | 2.5 in | 14.7 h |
| June | 74°F | 53°F | 1.6 in | 15.5 h |
| July | 81°F | 57°F | 0.4 in | 15.2 h |
| August | 82°F | 57°F | 0.5 in | 13.9 h |
| September | 76°F | 52°F | 1.4 in | 12.3 h |
| October | 64°F | 45°F | 3.4 in | 10.7 h |
| November | 53°F | 39°F | 5.5 in | 9.2 h |
| December | 47°F | 35°F | 6.1 in | 8.5 h |
| Year total | 37.4 in |
NOAA 1991–2020 climate normals from station USW00094298, 0.4 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 Vancouver is at that time of year.
Fort Vancouver weather by season
Winter: December to February
Average highs climb from 47°F in December to 51°F in February, with average lows near 35°F. Together the three months average 15.2 inches of precipitation, about 41% of the yearly total and more than in any other season. Daylight is at its shortest, about 8.5 hours in December.
Spring: March to May
Average highs climb from 56°F in March to 68°F in May, with average lows between 38°F and 48°F. Together the three months average 9.4 inches of precipitation, about 25% of the yearly total. Daylight lengthens from about 11.6 hours in March to 14.7 in May.
Summer: June to August
Average highs climb from 74°F in June to 82°F in August, with average lows between 53°F and 57°F. Together the three months average 2.5 inches of precipitation, about 7% of the yearly total and less than in any other season. Daylight is at its longest, about 15.5 hours in June.
Fall: September to November
Average highs fall from 76°F in September to 53°F in November, with average lows between 39°F and 52°F. Together the three months average 10.3 inches of precipitation, about 28% of the yearly total. Daylight shortens from about 12.3 hours in September to 9.2 in November.
What the National Park Service says about the weather
Fort Vancouver National Historic Site is located in a mild, temperate climate. However, in the case of severe weather, park alerts posted on the park's website will provide information about emergency closures.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Fort Vancouver
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 45.62°N, 122.66°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 Vancouver National Historic Site →
Weather and crowds together
August, the warmest month, sees about 1.3× the visitors of the park's average month. July is the busiest month of the year and December the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Fort Vancouver National Historic Site. For hotels, cabins and rentals close to the park, see where to stay near Fort Vancouver.
Where to stay near Fort Vancouver
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Top-rated places to stay near Fort Vancouver
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Frequently Asked Questions
August is the warmest month at Fort Vancouver National Historic Site, with an average high of 82°F and an average low of 57°F. That is the 1991–2020 average at the nearest long-record NOAA station, 0.4 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Fort Vancouver National Historic Site, with an average low of 34°F and an average high of 47°F, based on NOAA 1991–2020 climate normals.
December is the wettest month, with about 6.1 inches of precipitation. July is the driest, at about 0.4 inches. The station records about 37.4 inches of precipitation in an average year.
Daylight at Fort Vancouver National Historic Site runs from about 8.5 hours a day in December to about 15.5 hours in June, computed from the park's latitude.
Weather at nearby parks
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00094298), 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.