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

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Highlights
- Castro Valley has 88.5% more rainy days than Riverside.
- Castro Valley has 5.8% less Sunny Days than Riverside.
- On the BestPlaces comfort index, Castro Valley scores 1.1% worse than Riverside
 Riverside, CACastro Valley, CAUnited States
 Rainfall  Unlock2138
 Snowfall0  Unlock28
 Precipitation  Unlock66106
 Sunny277  Unlock205
 Avg. July High  Unlock7686
 Avg. Jan. Low42  Unlock22
 Comfort Index (higher=better)  Unlock8.67
 UV Index5.7  Unlock4.3
 Elevation  Unlock1612443
Reviews for Riverside    42 Reviews

I've lived in Riverside for 54 years. It changed a LOT when people from LA started moving here in droves. Still, I have never been robbed or assaulted but I am  More

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I'm from Orange County (OC). I have had nothing but trouble since moving to Riverside. 1. The dogs are aggressive guard dogs. If you want to walk or bike you  More

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Over 8 years ago

Whew where to begin with dear old riverside. I enjoyed growing up here until my high school years (back in 2011). In 7 short years the downward deterioration of the  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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