Castro Valley, CA Weather
Castro Valley, CA climate is mild during summer when temperatures tend to be in the 60's and cool during winter when temperatures tend to be in the 50's.
The warmest month of the year is September with an average maximum temperature of 76.30 degrees Fahrenheit, while the coldest month of the year is December with an average minimum temperature of 41.20 degrees Fahrenheit.
Temperature variations between night and day tend to be moderate during summer with a difference that can reach 21 degrees Fahrenheit, and fairly limited during winter with an average difference of 17 degrees Fahrenheit.
The annual average precipitation at Castro Valley is 26.30 Inches. Winter months tend to be wetter than summer months. The wettest month of the year is January with an average rainfall of 5.20 Inches.
Moon, Sunrise and Sunset
|Moon Phase: Waxing Gibbous Moon||Civil Twilight:
5:23 AM PDT
5:53 AM PDT
8:16 PM PDT
8:46 PM PDT