Muir Beach, CA climate
Muir Beach has warm winters and cool summers. A typical July afternoon reaches 69°, a January night drops to 44°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Muir Beach feels like
Winter
Spring
Summer
Fall
Muir Beach weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 56° | 44° | 6.4" | 0 | 14 | 0 | 47° – 55° |
| February | 58° | 46° | 6.4" | 0 | 13 | 0 | 48° – 57° |
| March | 60° | 46° | 4.7" | 0 | 12 | 0 | 49° – 58° |
| April | 62° | 48° | 2.2" | 0 | 9 | 0 | 51° – 58° |
| May | 64° | 50° | 1.0" | 0 | 5 | 0 | 53° – 61° |
| June | 68° | 52° | 0.3" | 0 | 4 | 0 | 57° – 62° |
| July | 69° | 53° | 0.0" | 0 | 2 | 0 | 59° – 64° |
| August | 71° | 55° | 0.1" | 0 | 3 | 0 | 60° – 66° |
| September | 71° | 55° | 0.1" | 0 | 3 | 0 | 59° – 67° |
| October | 69° | 52° | 1.5" | 0 | 6 | 0 | 58° – 65° |
| November | 62° | 48° | 3.6" | 0 | 10 | 0 | 49° – 58° |
| December | 56° | 45° | 7.3" | 0 | 15 | 0 | 47° – 55° |
| Year | 64° | 49° | 33.5" | 0.0" | 96 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Muir Beach
Muir Beach gets 33 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 96 days a year.
A year-round growing season
Heating and cooling a home in Muir Beach
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Muir Beach, 92% of that work is heating and 8% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Muir Beach compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Muir Beach averaged 1.5° warmer than the 1900s. The biggest change is in January (+2.2°). The shift is larger than in 68% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Muir Beach’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 48° to 57°. June is the most reliable, staying within 5°.
Common questions about Muir Beach’s climate
What is the coldest month in Muir Beach?
January, with a typical high of 56° and a low of 44°.
What is the hottest month in Muir Beach?
September, with a typical high of 71° and a low of 55°. About 5 days a year reach 90°.
How much snow does Muir Beach get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Muir Beach?
Frost is uncommon. Only 22% of years see a night at 32° or below.
What is the rainiest month in Muir Beach?
December, with 7.3 inches of rain and melted snow. The year totals 33 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Muir Beach itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Muir Woods, CA (3 mi, snow) and Richmond, CA (12 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.