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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
San Bruno, CA
Content continues below
May
Average Temperature
High
17°
Feels 17
Low
10°
Feels 8
Average Precipitation
2 Days
Rain amount
6.8mm
Snow amount
0cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
17°
26
18°
27
19°
28
19°
29
17°
30
17°
31
18°
Forecast
Monday, May 25, 2026
Day
17°
Feels 16
Wind
33 km/h W
Gust
49 km/h
Humidity
66%
P.O.P
20%
Night
12°
Feels 9
Wind
28 km/h W
Gust
42 km/h
Humidity
92%
P.O.P
40%
Rain
<1 mm
Historical Averages
May 25
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.