2026 Compare Cities Climate:
Napa, CA vs Castro Valley, CA

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Highlights
- Castro Valley has 22.0% less rainy days than Napa.
- Castro Valley has 0.4% more Sunny Days than Napa.
- On the BestPlaces comfort index, Castro Valley scores 2.4% better than Napa
 Napa, CACastro Valley, CAUnited States
 Rainfall  Unlock2138
 Snowfall0  Unlock28
 Precipitation  Unlock66106
 Sunny260  Unlock205
 Avg. July High  Unlock7686
 Avg. Jan. Low38  Unlock22
 Comfort Index (higher=better)  Unlock8.67
 UV Index5.4  Unlock4.3
 Elevation  Unlock1612443
Reviews for Napa    19 Reviews

I have lived in Napa for 20 years. In that time, Napa has changed dramatically. Today, Napa is very much a Hispanic community. Many Latinos don't or won't speak English  More

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My longtime Napa home burned to smithereens in 2017. That same night, a crazy stalker set her sights on me. Two nights after the fire, she showed up at my rescue house  More

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Napa is a very easy place to live, especially for those contemplating retirement. The pace of life is peaceful. The weather is superb -- never miserably cold or hot but  More

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Reviews for Castro Valley    7 Reviews

CURMUDGEON - THANK YOU for your post. The most important part of your comment is your second paragraph. "Hodge-Podge" is the correct word for a lot of Castro  More

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Over 12 years ago

Kind of rural but close to Oakland and San  More

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Castro Valley is the largest unincorporated "city" in the Bay Area. Over the years, several attempts have been made to incorporate, but they have all been defeated at  More

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