TODAY NOV15
TEMPERATURE57
HUMIDITY64
PRESSURE30.26
WIND COND.170 5.8
  • 5339Fri60%
  • 5234Sat
  • 5135Sun
  • 5238Mon
  • 5340Tue
daynightWeather update from Renton, Renton Municipal Airport at

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Mercer Island Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January36°F49°F42°F5.1"
February37°F52°F44°F3.8"
March40°F55°F47°F4.9"
April43°F61°F51°F3.1"
May49°F68°F57°F2.2"
June54°F72°F62°F1.5"
July58°F79°F67°F0.4"
August58°F79°F68°F0.6"
September54°F73°F62°F1.6"
October47°F62°F54°F3.9"
November40°F53°F47°F6.6"
December36°F48°F41°F6.1"

Did you know?

  • The highest monthly average temperature in Mercer Island for August is 68 degrees.
  • The lowest monthly average temperature in Mercer Island for December is 41 degrees.
  • The most monthly precipitation in Mercer Island occurs in November with 6.6 inches.
  • The air quality index in Mercer Island is 1% better than the national average.
  • The pollution index in Mercer Island is 78% better than the national average.

Real Estate Listings In Mercer Island

Compare Mercer Island, WA Weather To Other Cities

Mercer Island air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexMercer IslandWashingtonNational
Air quality index493650
Pollution index1,081,4308,596,9895,066,862

Mercer Island air quality information

MeasurementTotal
Days measured365
Days with good air quality195
Days with moderate air quality162
Days w/ poor A.Q. for sensitive groups8
Days with unhealthy air quality

Mercer Island air quality information

PollutantTotal
Arsenic0.000%
Benzene0.010%
Carbon Tetrachloride0.000%
Lead0.000%
Mercury0.000%

Average monthly Mercer Island temperature with heat index

Mercer Island monthly precipitation with daily maximum

Mercer Island monthly snow depth with daily maximum

Mercer Island monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Southworth, WA2,1581766%
Manchester, WA5,2421766%
Bainbridge Island, WA23,576492%
Bothell East, WA10,064492%
Burien, WA50,187492%
Mercer Island, WA24,467492%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Athens, AL24,4613726%
West Puente Valley, CA24,4767448%
Walker, MI24,4583922%
San Benito, TX24,4424118%
Loves Park, IL24,4993138%
Mercer Island, WA24,467492%
Source: The Mercer Island, WA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.