Annual mean 16°C · wettest around March · prevailing wind NW
Warmest
25.6 °C
Coldest
12.1 °C
Wettest
16%
Windiest
5.4 m/s
Prevailing
NW
4.1 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
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 Ramon over the whole year is 16°C. August is the hottest month, with highs of about 25°C; December is the coldest, with lows of about 7°C. The rainy (wet) season in San Ramon runs from November to March, peaking in March with a 18% chance of rain on a given day. The dry season is April to October; July is the driest month, at 1%. Winds in San Ramon are highest in June, averaging 4.5 m/s (16 km/h), and lightest in November, at 2.1 m/s (8 km/h). The prevailing wind is from the NW. The clearest skies in San Ramon come in June, when the sky is typically 16% covered; January is the cloudiest month, at 45%.
Month by month San Ramon 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
13°C
8°C
10°C
17%
45%
2.4 m/s
12
0
80
February
14°C
8°C
11°C
16%
32%
2.8 m/s
25
0
79
March
16°C
9°C
12°C
18%
41%
3.2 m/s
32
1
83
April
19°C
11°C
16°C
8%
29%
3.6 m/s
60
5
85
May
21°C
13°C
18°C
5%
27%
4.3 m/s
72
14
77
June
24°C
15°C
22°C
1%
16%
4.5 m/s
77
30
58
July
25°C
16°C
23°C
1%
17%
4.5 m/s
77
39
50
August
25°C
16°C
24°C
1%
19%
4.2 m/s
77
43
46
September
24°C
16°C
23°C
1%
20%
3.5 m/s
78
34
54
October
22°C
13°C
20°C
5%
19%
2.7 m/s
81
18
73
November
17°C
9°C
14°C
10%
30%
2.1 m/s
46
1
90
December
13°C
7°C
10°C
16%
41%
2.2 m/s
12
0
80
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 Ramon weather by season
Year round, San Ramon has days of about 13°C at their warmest in January, its coolest month, and 25°C in August, its warmest; the coolest hours of the day run from 7°C to 16°C through the year, and the average temperature over the year is 16°C around the clock. Rain is most likely around March 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 Ramon weather in winterDecember to February
High 13°CLow 8°CRain 16%
Winter in San Ramon has typical daily highs of about 13°C and lows of about 8°C, with a 16% chance of rain on a given day.
San Ramon weather in springMarch to May
High 18°CLow 11°CRain 10%
Spring in San Ramon has typical daily highs of about 18°C and lows of about 11°C, with a 10% chance of rain on a given day.
San Ramon weather in summerJune to August
High 25°CLow 16°CRain 1%
Summer in San Ramon has typical daily highs of about 25°C and lows of about 16°C, with a 1% chance of rain on a given day.
San Ramon weather in autumnSeptember to November
High 21°CLow 13°CRain 5%
Autumn in San Ramon has typical daily highs of about 21°C and lows of about 13°C, with a 5% chance of rain on a given day.
When is the rainy season in San Ramon?
The rainy (wet) season in San Ramon runs from November to March, peaking in March with a 18% chance of rain on a given day. The dry season is April to October; July is the driest month, at 1%.
What time of year is San Ramon windiest?
Winds in San Ramon are highest in June, averaging 4.5 m/s (16 km/h), and lightest in November, at 2.1 m/s (8 km/h). The prevailing wind is from the NW.
What is the average temperature in San Ramon year round?
The average temperature in San Ramon over the whole year is 16°C. August is the hottest month, with highs of about 25°C; December is the coldest, with lows of about 7°C.