Updated October 2026
Thornton State Beach: Weather by Month and When to Go
Thornton State Beach is part of the California state park system. The USGS Protected Areas Database maps about 63 acres under its name. Average highs range from 59°F in December and January to 66°F in October.
Average highs sit between 60°F and 80°F in February through November. They stay below 60°F in December and January. The figures are NOAA climate normals for 1991–2020, measured at a weather station 2.2 miles from the park.
Warmest average high
66°F
October
Coldest average low
46°F
December and January
Most precipitation
4.2 in
December
Longest days
14.6 h
June
Thornton State Beach weather by month
| Month | Average high | Average low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 59°F | 46°F | 3.9 in | 9.7 h |
| February | 60°F | 47°F | 4.0 in | 10.6 h |
| March | 61°F | 48°F | 3.0 in | 11.7 h |
| April | 60°F | 49°F | 1.4 in | 13.0 h |
| May | 60°F | 51°F | 0.6 in | 14.0 h |
| June | 61°F | 53°F | 0.2 in | 14.6 h |
| July | 62°F | 54°F | 0.0 in | 14.4 h |
| August | 64°F | 55°F | 0.1 in | 13.5 h |
| September | 65°F | 55°F | 0.1 in | 12.2 h |
| October | 66°F | 53°F | 0.9 in | 11.0 h |
| November | 64°F | 50°F | 2.2 in | 9.9 h |
| December | 59°F | 46°F | 4.2 in | 9.4 h |
Temperature and precipitation figures are NOAA climate normals for 1991–2020 from station USC00047767, the nearest station with a complete set of temperature normals, 2.2 miles from the park. Conditions in the park can differ from the station's, most of all where the two sit at different elevations. Daylight is calculated for the park's latitude at the middle of each month. The acreage is what the USGS Protected Areas Database maps under the park's name. The state's own figure can differ, because the database may hold part of a park under another name.
What the averages show
- Temperature. October is the warmest month, with an average high of 66°F and an average low of 53°F. December and January are the coldest months, each with an average low of 46°F.
- Precipitation. December is the wettest month, averaging 4.2 inches of precipitation, and July is the driest, at 0.0 inches. An average year brings about 20.6 inches in total.
- Snowfall. The station's snowfall normal is 0.0 inches in every month.
- Daylight. Days run from about 9.4 hours of daylight in December to 14.6 hours in June.
Camping, trails, maps and fees
Whether Thornton State Beach has camping or cabins, where its trails run, when it opens and what it charges are all published by the agency that runs the park. Its official page is the place to check before a trip.
Official Thornton State Beach page
For the forecast rather than the averages, the National Weather Service issues a point forecast for the park's location.
Where to stay near Thornton State Beach
Hotels, cabins and vacation rentals near Thornton State Beach, with live availability and prices.
Top-rated places to stay near Thornton State Beach
Prices for Oct 16–18, 4 adults. Change dates on the map below.
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Frequently Asked Questions
October is the warmest month, with an average high of 66°F and an average low of 53°F. December and January are the coldest months, each with an average low of 46°F. These are NOAA 1991–2020 climate normals from a weather station 2.2 miles from the park.
Average highs sit between 60°F and 80°F in February through November. They stay below 60°F in December and January.
December is the wettest month, averaging 4.2 inches of precipitation, and July is the driest, at 0.0 inches. An average year brings about 20.6 inches in total. The station's snowfall normal is 0.0 inches in every month.
Days run from about 9.4 hours of daylight in December to 14.6 hours in June. The hours are calculated for the park's latitude.
Nearest National Park Service sites
- Fort Point National Historic Site8 miles away
- San Francisco Maritime National Historical Park9 miles away
- Golden Gate National Recreation Area13 miles away
Nearby state parks
- Montara State Beach9 miles away
- Gray Whale Cove State Beach9 miles away
- Mount Tamalpais State Park15 miles away
- Half Moon Bay State Beach16 miles away
Distances are measured in a straight line from the park, so the drive is longer.
Sources: NOAA NCEI U.S. Climate Normals 1991–2020; USGS Protected Areas Database for location and acreage; the official California state park listing for the park's name.