2025 Compare Cities Climate:
Mercer Island, WA vs Sumner, WA

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Highlights
- Sumner has 24.7% more rainy days than Mercer Island.
- Sumner has 9.6% less Sunny Days than Mercer Island.
- On the BestPlaces comfort index, Sumner scores 5.3% worse than Mercer Island
 Mercer Island, WASumner, WAUnited States
 Rainfall  Unlock4938
 Snowfall5  Unlock28
 Precipitation  Unlock172106
 Sunny156  Unlock205
 Avg. July High  Unlock7686
 Avg. Jan. Low37  Unlock22
 Comfort Index (higher=better)  Unlock7.17
 UV Index2.6  Unlock4.3
 Elevation  Unlock752443
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 Sumner    2 Reviews

Sumner is a wonderfully small but growing community nestled in the a beautiful and fertile valley of Western Washington. Only minutes from the major cities, the small  More

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Over 19 years ago

Sumner Washington is located in the Puyallup valley which by definition is flat and walkable. The city adminstration and council are very focused on maintaining a small  More

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