United States of AmericaCountries United States of America California Castro Valley Sun Percentage
United States of AmericaUnited States of America California Castro Valley
Castro Valley
Average sun percentage
Climate ▸Forecast ▸December ▸January ▸
JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember

Average percent of sunshine in Castro Valley (CA)

The mean percent of sunhours during the day in Castro Valley (California), the United States of America.


  • The sun shines on average 78.0% in April making it the most sunny month.
  • On average, December has the lowest percentage of sunshine with 54.0%.

Forecast: is it sunny in Castro Valley (CA)?

Tue   Dec 24
17°C | 10°C
W 5 m/s
13 mm
partly cloudy and rain

partly cloudy and rain

hourly forecast
Wed   Dec 25
14°C | 7°C
W 3 m/s
broken clouds and no rain

broken clouds and no rain

hourly forecast
Thu   Dec 26
16°C | 10°C
S 3 m/s
2.5 mm
overcast and slight rain

overcast and slight rain

hourly forecast
5-Day Forecast 10-Day Forecast

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