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Hourly Forecast
Daylight Hours
05:17
Sunrise
20:58
Sunset
Daily Forecast
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Saturday
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Tuesday
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Resources
UV Index
Humidity
Frequently asked questions about weather in Mercer Island
How warm does it get in Mercer Island?
The warmest month in Mercer Island is August, with average high temperatures of 25°C. The average temperature during this period is around 19°C.
How cold does it get in Mercer Island?
The coldest month in Mercer Island is February, with average low temperatures of 4°C. The average temperature during this period is around 6°C.
What is the wettest time of year in Mercer Island?
The wettest month in Mercer Island is December, with an average of 199mm of precipitation.
What is the driest time of year in Mercer Island?
The driest month in Mercer Island is July, with an average of 15mm of precipitation.
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