2025 Compare Cities Climate:
Mercer Island, WA vs Costa Mesa, CA

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Highlights
- Costa Mesa has 69.4% less rainy days than Mercer Island.
- Costa Mesa has 75.6% more Sunny Days than Mercer Island.
- On the BestPlaces comfort index, Costa Mesa scores 24.0% better than Mercer Island
 Mercer Island, WACosta Mesa, CAUnited States
 Rainfall  Unlock1238
 Snowfall5  Unlock28
 Precipitation  Unlock36106
 Sunny156  Unlock205
 Avg. July High  Unlock7886
 Avg. Jan. Low37  Unlock22
 Comfort Index (higher=better)  Unlock9.37
 UV Index2.6  Unlock4.3
 Elevation  Unlock982443
Reviews for Mercer Island    4 Reviews

Mercer Island is a wonderful family community. It feels much more "small town" than a city even though it has a population of 20,000+. People say hello and watch out  More

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Mercer Island is a suburb of Seattle, located on an island in Lake Washington. The best thing about Mercer Island is its strategically central location relative to the  More

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Mercer Island is a suburb of Seattle, located on an island in Lake Washington. The best thing about Mercer Island is its strategically central location relative to the  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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