2025 Compare Cities Climate:
Castro Valley, CA vs Costa Mesa, CA

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Highlights
- Costa Mesa has 43.7% less rainy days than Castro Valley.
- Costa Mesa has 5.0% more Sunny Days than Castro Valley.
- On the BestPlaces comfort index, Costa Mesa scores 8.1% better than Castro Valley
 Castro Valley, CACosta Mesa, CAUnited States
 Rainfall  Unlock1238
 Snowfall0  Unlock28
 Precipitation  Unlock36106
 Sunny261  Unlock205
 Avg. July High  Unlock7886
 Avg. Jan. Low42  Unlock22
 Comfort Index (higher=better)  Unlock9.37
 UV Index5.4  Unlock4.3
 Elevation  Unlock982443
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 11 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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Reviews for Costa Mesa    8 Reviews

Over 15 years ago

Costa mesa has awesome shopping but is way too crowded and I have had 3 cars stolen in the past 5 years along with countless break-ins and theft. Expensive. Close to  More

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Over 16 years ago

Costa Mesa has a near perfect climate . . . plenty of sun but rarely over 100 degrees (our house doesn't even have AC). Nestled between Newport Beach and Huntington  More

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We have a good amount of low-income, medium-income, and relatively high-income  More

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