Monthly Historical AveragesCastro Valley, CA
Average Temperature
High
16°
Feels 16
Low
7°
Feels 5
Average Precipitation
7 Days
64.5mm
0cm
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Daily Historical Averages
S
M
T
W
T
F
S
ForecastTuesday, February 17, 2026
Day
10°Feels 8
Wind
26 km/h SW
Gust
39 km/h
Humidity
73%
P.O.P
100%
Rain
15-20 mm
Night
6°Feels 4
Wind
19 km/h W
Gust
28 km/h
Humidity
92%
P.O.P
80%
Rain
~5 mm
Historical AveragesFeb 17
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity