Annual mean 14°C · wettest around January · prevailing wind SW
Warmest
20.7 °C
Coldest
11.4 °C
Wettest
95%
Windiest
4.5 m/s
Prevailing
SW
3.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in San Anselmo over the whole year is 14°C. September is the hottest month, with highs of about 20°C; December is the coldest, with lows of about 9°C. The rainy (wet) season in San Anselmo runs from September to May, peaking in January with a 91% chance of rain on a given day. The dry season is June to August; July is the driest month, at 39%. Winds in San Anselmo are highest in June, averaging 3.6 m/s (13 km/h), and lightest in October, at 2.3 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in San Anselmo come in June, when the sky is typically 21% covered; January is the cloudiest month, at 49%.
Month by month San Anselmo climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
12°C
10°C
11°C
91%
49%
2.4 m/s
11
0
77
February
13°C
9°C
11°C
91%
33%
2.7 m/s
14
0
74
March
14°C
10°C
12°C
91%
43%
2.7 m/s
17
0
78
April
15°C
11°C
14°C
89%
31%
3.0 m/s
37
3
79
May
16°C
12°C
16°C
88%
30%
3.3 m/s
48
7
78
June
18°C
14°C
17°C
55%
21%
3.6 m/s
50
13
71
July
18°C
14°C
19°C
39%
26%
3.4 m/s
61
21
64
August
19°C
15°C
21°C
41%
28%
3.1 m/s
71
23
61
September
20°C
16°C
20°C
66%
27%
2.6 m/s
70
19
66
October
19°C
14°C
18°C
83%
28%
2.3 m/s
66
13
72
November
15°C
11°C
13°C
90%
34%
2.3 m/s
28
1
82
December
12°C
9°C
11°C
91%
47%
2.4 m/s
11
0
75
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short San Anselmo weather by season
Year round, San Anselmo has days of about 12°C at their warmest in January, its coolest month, and 20°C in September, its warmest; the coolest hours of the day run from 9°C to 16°C through the year, and the average temperature over the year is 14°C around the clock. Rain is most likely around January and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
San Anselmo weather in winterDecember to February
High 12°CLow 9°CRain 91%
Winter in San Anselmo has typical daily highs of about 12°C and lows of about 9°C, with a 91% chance of rain on a given day.
San Anselmo weather in springMarch to May
High 15°CLow 11°CRain 89%
Spring in San Anselmo has typical daily highs of about 15°C and lows of about 11°C, with a 89% chance of rain on a given day.
San Anselmo weather in summerJune to August
High 18°CLow 14°CRain 45%
Summer in San Anselmo has typical daily highs of about 18°C and lows of about 14°C, with a 45% chance of rain on a given day.
San Anselmo weather in autumnSeptember to November
High 18°CLow 13°CRain 79%
Autumn in San Anselmo has typical daily highs of about 18°C and lows of about 13°C, with a 79% chance of rain on a given day.
When is the rainy season in San Anselmo?
The rainy (wet) season in San Anselmo runs from September to May, peaking in January with a 91% chance of rain on a given day. The dry season is June to August; July is the driest month, at 39%.
What time of year is San Anselmo windiest?
Winds in San Anselmo are highest in June, averaging 3.6 m/s (13 km/h), and lightest in October, at 2.3 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in San Anselmo year round?
The average temperature in San Anselmo over the whole year is 14°C. September is the hottest month, with highs of about 20°C; December is the coldest, with lows of about 9°C.