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San Ramon, CA 52℉
April 25, 2017 7:34am
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San Ramon Climate

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San Ramon Climate and Weather

San Ramon, like the rest of California enjoys a Mediterranean climate characterized by temperate weather, seasonal changes, and moderate temperatures. Summers are warm and dry, while winters are cool and wet. Its weather is like that of the adjacent cities of Danville, Dublin, and Pleasanton. Fog is a relatively infrequent in the city except for the western parts of the city, at the eastern mouth of Crow Canyon. Here the marine layer from the San Francisco Bay via Castro Valley tunnels through. It usually burns off by mid- to late morning.

The warmest month of the year is July with an average maximum temperature of 85.20 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 39.30 degrees Fahrenheit.

Temperature variations between night and day are greater during summer with a difference that can reach 26 degrees Fahrenheit, and less during winter with an average difference of 16 degrees Fahrenheit. (Note: if you are traveling to San Francisco, dress in layers as the weather and microclimates can change quickly and cool off suddenly.)

The annual average precipitation at San Ramon is 23.96 inches. The U.S. average rainfall is 37 inches. Most of the rain falls from early winter to late spring. There is little or no rain in the summer months. The wettest month of the year is January with an average rainfall of 4.76 Inches. July is usually the driest month, with an average of only 0.06 inches (1.5 mm) of precipitation. Normally snow is exceedingly rare.

On average, there are 256 sunny days per year in San Ramon. The July high is around 87 degrees. The January low is 39. Our comfort index, which is based on humidity during the hot months, is a 55 out of 100, where higher is more comfortable. The US average on the comfort index is 44. Humidity in San Ramon is rarely over 70%.

If you are visiting San Ramon you’ll enjoy the nice weather. Bring a sweater as it can get cold in the evenings.

 

Climate data for San Ramon, California
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 75
(24)
80
(27)
88
(31)
96
(36)
104
(40)
113
(45)
113
(45)
112
(44)
115
(46)
106
(41)
90
(32)
79
(26)
115
(46)
Average high °F (°C) 58
(14)
61
(16)
63
(17)
67
(19)
69
(21)
73
(23)
75
(24)
76
(24)
76
(24)
73
(23)
65
(18)
59
(15)
67
(19)
Average low °F (°C) 38
(3)
40
(4)
43
(6)
45
(7)
49
(9)
53
(12)
56
(13)
56
(13)
54
(12)
49
(9)
42
(6)
38
(3)
46
(8)
Record low °F (°C) 18
(−8)
19
(−7)
22
(−6)
28
(−2)
32
(0)
38
(3)
36
(2)
40
(4)
35
(2)
29
(−2)
23
(−5)
18
(−8)
18
(−8)
Precipitation inches (mm) 5.20
(132.1)
4.64
(117.9)
4.27
(108.5)
1.72
(43.7)
0.71
(18)
0.15
(3.8)
0.06
(1.5)
0.11
(2.8)
0.36
(9.1)
1.15
(29.2)
3.69
(93.7)
3.84
(97.5)
25.90
(657.9)