Point Forecast: Mercer Island WA
 47.56N 122.21W (Elev. 121 ft)
Last Update: 8:01 pm PDT Jul 14, 2025
Tabular Forecast
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Weather ElementsWeather/PrecipitationFire Weather
Temperature (°F)
Dewpoint (°F)
Heat Index (°F)

Surface Wind  
Sky Cover (%)
Precipitation Potential (%)
Relative Humidity (%)
Rain
Thunder
Fog
Mixing Height  
Trans. Wind  

48-Hour Period Starting:       Back 2 Days  

Date07/15
Hour (PDT)000102030405060708091011121314151617181920212223
Temperature (°F)666564626262616365677276778083848485848482787574
Dewpoint (°F)575756545656555657565960585960585757565555565556
Heat Index (°F)767781838483848383817875
Surface Wind (mph)532112112556888887876555
Wind DirENEEENEENESSSESESENNNNWNNWNNWNNWNNWNNWNNWNNWNNNNNNEENE
Gust
Sky Cover (%)58122321202927241095573446687764
Precipitation Potential (%)000000000000000000000000
Relative Humidity (%)727474768081827975686357524845424038383740465053
Rain------------------------------------------------
Thunder------------------------------------------------

Date07/16
Hour (PDT)000102030405060708091011121314151617181920212223
Temperature (°F)717068666565656769737780848789909190898683807673
Dewpoint (°F)555554535353535556575857585858565655565757575756
Heat Index (°F)77808386888889888785828076
Surface Wind (mph)553331111113335556665555
Wind DirENEENENENENENENENEWNWWNWWNWWNWWNWWNWWWWWNWWNWWNWNNNNE
Gust
Sky Cover (%)442223335554443338886666
Precipitation Potential (%)000000000000000000000000
Relative Humidity (%)565860626566666663585145413735323131333741465156
Rain------------------------------------------------
Thunder------------------------------------------------

Additional Forecasts and Information
International System of UnitsForecast Discussion
7-Day ForecastHourly Weather Graph
NWS GIS Viewer (previously user-defined area forecast)