Updated October 2026
Rosie the Riveter WWII Home Front National Historical Park Weather by Month
Rosie the Riveter WWII Home Front National Historical Park is warmest in September, when the nearest NOAA climate station averages a high of 75°F and a low of 56°F, and coldest in January, with an average high of 58°F and an average low of 44°F. December is the wettest month, with about 4.9 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, 1.1 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Rosie the Riveter WWII Home Front National Historical Park can differ from these, particularly with elevation.
Warmest month
Sep
75°F avg high
Coldest month
Jan
44°F avg low
Wettest month
Dec
4.9 in avg
Longest days
Jun
14.6 h of daylight
Average weather at Rosie the Riveter WWII Home Front by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 58°F | 44°F | 4.8 in | 9.6 h |
| February | 61°F | 46°F | 4.8 in | 10.6 h |
| March | 64°F | 47°F | 3.2 in | 11.7 h |
| April | 67°F | 49°F | 1.6 in | 13.0 h |
| May | 69°F | 52°F | 0.7 in | 14.0 h |
| June | 72°F | 54°F | 0.3 in | 14.6 h |
| July | 71°F | 55°F | 0.0 in | 14.4 h |
| August | 72°F | 56°F | 0.1 in | 13.5 h |
| September | 75°F | 56°F | 0.0 in | 12.2 h |
| October | 73°F | 54°F | 1.4 in | 11.0 h |
| November | 65°F | 49°F | 2.7 in | 9.9 h |
| December | 58°F | 44°F | 4.9 in | 9.4 h |
| Year total | 24.5 in |
NOAA 1991–2020 climate normals from station USC00047414, 1.1 miles from the park's reference point. The station's snowfall normal is zero in all twelve months. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Rosie the Riveter WWII Home Front is at that time of year.
Rosie the Riveter WWII Home Front weather by season
Winter: December to February
Average highs climb from 58°F in December to 61°F in February, with average lows near 45°F. Together the three months average 14.5 inches of precipitation, about 59% of the yearly total and more than in any other season. Daylight is at its shortest, about 9.4 hours in December.
Spring: March to May
Average highs climb from 64°F in March to 69°F in May, with average lows between 47°F and 52°F. Together the three months average 5.5 inches of precipitation, about 22% of the yearly total. Daylight lengthens from about 11.7 hours in March to 14.0 in May.
Summer: June to August
Average highs hold near 72°F in all three months, with average lows near 55°F. Together the three months average 0.4 inches of precipitation, about 2% of the yearly total and less than in any other season. Daylight is at its longest, about 14.6 hours in June.
Fall: September to November
Average highs fall from 75°F in September to 65°F in November, with average lows between 49°F and 56°F. Together the three months average 4.1 inches of precipitation, about 17% 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
Weather typical for San Francisco Bay Area. Can be cold and windy year round. Fog in the summer.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Rosie the Riveter WWII Home Front
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 37.91°N, 122.36°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 Rosie the Riveter WWII Home Front National Historical Park →
Weather and crowds together
September, the warmest month, sees about 0.9× the visitors of the park's average month. July 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 Rosie the Riveter WWII Home Front National Historical Park. For hotels, cabins and rentals close to the park, see where to stay near Rosie the Riveter WWII Home Front.
Where to stay near Rosie the Riveter WWII Home Front
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Frequently Asked Questions
September is the warmest month at Rosie the Riveter WWII Home Front National Historical Park, with an average high of 75°F and an average low of 56°F. That is the 1991–2020 average at the nearest long-record NOAA station, 1.1 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Rosie the Riveter WWII Home Front National Historical Park, with an average low of 44°F and an average high of 58°F, based on NOAA 1991–2020 climate normals.
December is the wettest month, with about 4.9 inches of precipitation. July and September are the driest, each averaging close to zero. The station records about 24.5 inches of precipitation in an average year.
The nearest long-record NOAA station, 1.1 miles from the park's reference point, shows no measurable snowfall in any month of its 1991–2020 normals.
Weather at nearby parks
8 mi away · warmest in September (70°F)
9 mi away · warmest in September (70°F)
12 mi away · warmest in August (83°F)
13 mi away · warmest in July (88°F)
14 mi away · warmest in August (83°F)
19 mi away · warmest in August (83°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00047414), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (2013–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.