Updated October 2026
San Francisco Maritime National Historical Park Weather by Month
San Francisco Maritime National Historical Park is warmest in September, when the nearest NOAA climate station averages a high of 70°F and a low of 56°F, and coldest in January, with an average high of 58°F and an average low of 47°F. December is the wettest month, with about 4.8 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, 2.7 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in San Francisco Maritime National Historical Park can differ from these, particularly with elevation.
Warmest month
Sep
70°F avg high
Coldest month
Jan
47°F avg low
Wettest month
Dec
4.8 in avg
Longest days
Jun
14.6 h of daylight
Average weather at San Francisco Maritime by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 58°F | 47°F | 4.4 in | 9.7 h |
| February | 60°F | 48°F | 4.4 in | 10.6 h |
| March | 62°F | 49°F | 3.2 in | 11.7 h |
| April | 63°F | 50°F | 1.6 in | 13.0 h |
| May | 64°F | 51°F | 0.7 in | 14.0 h |
| June | 67°F | 53°F | 0.2 in | 14.6 h |
| July | 66°F | 54°F | 0.0 in | 14.4 h |
| August | 68°F | 56°F | 0.1 in | 13.5 h |
| September | 70°F | 56°F | 0.1 in | 12.2 h |
| October | 70°F | 54°F | 0.9 in | 11.0 h |
| November | 64°F | 51°F | 2.6 in | 9.9 h |
| December | 58°F | 47°F | 4.8 in | 9.4 h |
| Year total | 23.0 in |
NOAA 1991–2020 climate normals from station USW00023272, 2.7 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded San Francisco Maritime is at that time of year.
San Francisco Maritime weather by season
Winter: December to February
Average highs hold near 59°F in all three months, with average lows near 47°F. Together the three months average 13.6 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 hold near 63°F in all three months, with average lows near 50°F. Together the three months average 5.5 inches of precipitation, about 24% 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 67°F in all three months, with average lows between 53°F and 56°F. Together the three months average 0.3 inches of precipitation, about 1% 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 70°F in September to 64°F in November, with average lows between 51°F and 56°F. Together the three months average 3.6 inches of precipitation, about 16% 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
San Francisco is located in a Mediterranean climate. The rainy season usually lasts from November to March. The warmest months are usually September and October. The famous San Francisco fog begins rolling in through the Golden Gate in the spring and can persist throughout the summer months. That said, the city can be foggy and windy any time of the year, so if your visit to “sunny California” includes a stop in San Francisco, bring some warm clothing. The average annual temperature is 62.5°F (16.9°C).
Weather description courtesy of the National Park Service — official park site.
Today's forecast for San Francisco Maritime
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 37.81°N, 122.42°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 San Francisco Maritime National Historical Park →
Weather and crowds together
September, the warmest month, sees about 1.0× 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 San Francisco Maritime National Historical Park. For hotels, cabins and rentals close to the park, see where to stay near San Francisco Maritime.
Where to stay near San Francisco Maritime
Picked a month for San Francisco Maritime National Historical Park? Compare hotels, cabins and vacation rentals near the park with live availability and prices.
Top-rated places to stay near San Francisco Maritime
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Frequently Asked Questions
September is the warmest month at San Francisco Maritime National Historical Park, with an average high of 70°F and an average low of 56°F. That is the 1991–2020 average at the nearest long-record NOAA station, 2.7 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at San Francisco Maritime National Historical Park, with an average low of 47°F and an average high of 58°F, based on NOAA 1991–2020 climate normals.
December is the wettest month, with about 4.8 inches of precipitation. July is the driest, averaging close to zero. The station records about 23 inches of precipitation in an average year.
Daylight at San Francisco Maritime National Historical Park runs from about 9.4 hours a day in December to about 14.6 hours in June, computed from the park's latitude.
Weather at nearby parks
3 mi away · warmest in September (70°F)
8 mi away · warmest in September (75°F)
10 mi away · warmest in August (83°F)
10 mi away · warmest in August (83°F)
20 mi away · warmest in July (88°F)
22 mi away · warmest in August (83°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00023272), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1989–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.