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Castro Valley, CA Weather & Current Conditions

94546 Weather (Castro Valley, CA)

Current Conditions and Weather for Castro Valley, California

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Mostly Cloudy at Castro Valley (94546), temperature is 60°F16°C, dew point 55°F13°C, humidity 83%. Wind direction is WSW at 3 mphat 5 km/h with visibility of 10 mi16 km. Barometric pressure is 30.01 in1016 mb. Last update: 3:00 am.*

*Time is approximately 3:00 am Sat, Aug 01, 2026. Time will be within 15 minutes of current local time. Castro Valley weather forecast data is updated every 15 minutes.

Sun & Moon

Converter

Cloud Cover	15%
uv UV Index	10
Sunrise	06:12 AM
Sunset	08:16 PM
Moonrise	09:56 PM
Moonset	09:13 AM

Civil Twilight
5:41 AM to 6:10 AM
8:15 PM to 8:44 PM
Waning Gibbous Moon

Weather Quote O' the Day

It was so cold out last night that even the ice cubes in my fridge were complaining. ―Guy Lawrence

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Castro Valley Weather Forecast

Weather forecast for: Castro Valley CA

Last Update: 2:01 am PDT Aug 1, 2026

Overnight: Partly cloudy, with a low around 57. South southwest wind around 5 mph.

Saturday: Partly sunny, then gradually becoming sunny, with a high near 86. Light south southwest wind becoming west southwest 5 to 9 mph in the morning.

Saturday Night: Increasing clouds, with a low around 58. South southwest wind 6 to 8 mph.

Sunday: Widespread haze before 8am. Sunny, with a high near 88. West wind 5 to 8 mph.

Sunday Night: Mostly clear, with a low around 58. Southwest wind 5 to 9 mph.

Monday: Sunny, with a high near 89.

Monday Night: Mostly clear, with a low around 59.

Tuesday: Sunny, with a high near 86.

Tuesday Night: Partly cloudy, with a low around 58.

Wednesday: Mostly sunny, with a high near 82.

Wednesday Night: Partly cloudy, with a low around 59.

Thursday: Mostly sunny, with a high near 83.

Thursday Night: Partly cloudy, with a low around 59.

Friday: Mostly sunny, with a high near 83.

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