Updated October 2026
John Muir National Historic Site Weather by Month
John Muir National Historic Site is warmest in July, when the nearest NOAA climate station averages a high of 88°F and a low of 51°F, and coldest in December, with an average high of 57°F and an average low of 35°F. January is the wettest month, with about 3.9 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, 2.3 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in John Muir National Historic Site can differ from these, particularly with elevation.
Warmest month
Jul
88°F avg high
Coldest month
Dec
35°F avg low
Wettest month
Jan
3.9 in avg
Longest days
Jun
14.6 h of daylight
Average weather at John Muir by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 56°F | 35°F | 3.9 in | 9.6 h |
| February | 61°F | 37°F | 3.8 in | 10.6 h |
| March | 66°F | 40°F | 2.7 in | 11.7 h |
| April | 71°F | 43°F | 1.3 in | 13.0 h |
| May | 78°F | 46°F | 0.6 in | 14.1 h |
| June | 85°F | 50°F | 0.3 in | 14.6 h |
| July | 88°F | 51°F | 0.0 in | 14.4 h |
| August | 87°F | 51°F | 0.0 in | 13.5 h |
| September | 84°F | 50°F | 0.1 in | 12.2 h |
| October | 76°F | 46°F | 0.8 in | 11.0 h |
| November | 64°F | 39°F | 2.1 in | 9.9 h |
| December | 57°F | 35°F | 3.8 in | 9.4 h |
| Year total | 19.4 in |
NOAA 1991–2020 climate normals from station USC00045378, 2.3 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 John Muir is at that time of year.
John Muir weather by season
Winter: December to February
Average highs bottom out at 56°F in January, between 57°F in December and 61°F in February, with average lows near 36°F. Together the three months average 11.5 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 66°F in March to 78°F in May, with average lows between 40°F and 46°F. Together the three months average 4.6 inches of precipitation, about 24% of the yearly total. 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 85°F in June and 87°F in August, with average lows near 51°F. Together the three months average 0.3 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 84°F in September to 64°F in November, with average lows between 39°F and 50°F. Together the three months average 3 inches of precipitation, about 15% 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
The Mediterranean climate of Martinez features hot, dry summers with lower temperatures near 60º F and upper temperatures near 100º F. The heat gives way to cool, rainy winters with lows near 45º F and highs near 75º F. Fall and spring can bring rain and temperatures from 55-80º F. March to April: wet/dry, 60-80º F May to September: very dry, 60-100º+ F October to November: dry/wet, 55-80º F December to February: wet, 45-75º F
Weather description courtesy of the National Park Service — official park site.
Today's forecast for John Muir
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 37.98°N, 122.13°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 John Muir National Historic Site →
Weather and crowds together
July, the warmest month, sees about 1.1× the visitors of the park's average month. April 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 John Muir National Historic Site. For hotels, cabins and rentals close to the park, see where to stay near John Muir.
Where to stay near John Muir
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Frequently Asked Questions
July is the warmest month at John Muir National Historic Site, with an average high of 88°F and an average low of 51°F. That is the 1991–2020 average at the nearest long-record NOAA station, 2.3 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
December is the coldest month at John Muir National Historic Site, with an average low of 35°F and an average high of 57°F, based on NOAA 1991–2020 climate normals.
January is the wettest month, with about 3.9 inches of precipitation. July and August are the driest, each averaging close to zero. The station records about 19.4 inches of precipitation in an average year.
The nearest long-record NOAA station, 2.3 miles from the park's reference point, shows no measurable snowfall in any month of its 1991–2020 normals.
Weather at nearby parks
12 mi away · warmest in August (83°F)
13 mi away · warmest in September (75°F)
20 mi away · warmest in September (70°F)
22 mi away · warmest in September (70°F)
25 mi away · warmest in August (83°F)
27 mi away · warmest in August (83°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00045378), 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.