Mercer Island, Washington | 10-Day Weather Forecasts & Weekend Weather | WeatherBug
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10 Day Forecast
  • Forecast day icon
    Saturday
    Chance of Rain
    63°
    Forecast night icon
    Night
    Chance of Rain Showers
    51°
    Saturday 9/23
    Day
    63°
    Chance of Rain
    Forecast day icon
    Night
    51°
    Chance of Rain Showers
    Forecast night icon
    Hourly
    Day Details
    Partly sunny in the morning then cloudy with a chance of rain early in the afternoon. Cloudy with rain at times late in the afternoon. Rainfall amounts a tenth to a quarter of an inch possible. Highs in the upper 50s to mid 60s. South wind around 10 mph becoming southwest in the afternoon.
    Night Details
    Cloudy with showers likely in the evening then cloudy with a chance of showers late in the evening. Partly cloudy after midnight. Patchy fog after midnight. Rainfall amounts a tenth to a quarter of an inch possible. Lows near 50. South wind around 10 mph in the evening becoming light.
  • Forecast day icon
    Sunday
    Chance of Rain
    64°
    Forecast night icon
    Night
    Rain
    57°
    Sunday 9/24
    Day
    64°
    Chance of Rain
    Forecast day icon
    Night
    57°
    Rain
    Forecast night icon
    Hourly
    Day Details
    Patchy fog in the morning. Mostly cloudy with a chance of rain. Highs in the upper 50s to mid 60s. Light wind becoming south to 10 mph in the afternoon.
    Night Details
    Rain. Rainfall amounts a quarter to a half inch possible. Lows in the 50s. East wind around 10 mph becoming southeast with gusts to 25 mph after midnight.
  • Forecast day icon
    Monday
    Chance of Storms
    64°
    Forecast night icon
    Night
    Chance of Storms
    57°
    Monday 9/25
    Day
    64°
    Chance of Storms
    Forecast day icon
    Night
    57°
    Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Rain at times in the morning then rain and a slight chance of thunderstorms in the afternoon. Highs in the lower to mid 60s.
    Night Details
    Breezy. Rain and a slight chance of thunderstorms in the evening then rain at times after midnight. Lows in the mid to upper 50s.
  • Forecast day icon
    Tuesday
    Chance of Storms
    63°
    Forecast night icon
    Night
    Rain
    55°
    Tuesday 9/26
    Day
    63°
    Chance of Storms
    Forecast day icon
    Night
    55°
    Rain
    Forecast night icon
    Hourly
    Day Details
    Rain at times in the morning then rain and a slight chance of thunderstorms in the afternoon. Highs in the lower 60s.
    Night Details
    Rain at times. Lows in the lower to mid 50s.
  • Forecast day icon
    Wednesday
    Chance of Storms
    61°
    Forecast night icon
    Night
    Rain
    53°
    Wednesday 9/27
    Day
    61°
    Chance of Storms
    Forecast day icon
    Night
    53°
    Rain
    Forecast night icon
    Hourly
    Day Details
    Rain at times in the morning then rain and a slight chance of thunderstorms in the afternoon. Highs near 60.
    Night Details
    Rain at times. Lows in the lower 50s.
  • Forecast day icon
    Thursday
    Rain
    58°
    Forecast night icon
    Night
    Rain
    52°
    Thursday 9/28
    Day
    58°
    Rain
    Forecast day icon
    Night
    52°
    Rain
    Forecast night icon
    Hourly
    Day Details
    Rain likely in the morning then rain at times in the afternoon. Highs near 60.
    Night Details
    Mostly cloudy with rain likely. Lows near 50.
  • Forecast day icon
    Friday
    Chance of Rain
    59°
    Forecast night icon
    Night
    40% Chance of Rain
    51°
    Friday 9/29
    Day
    59°
    Chance of Rain
    Forecast day icon
    Night
    51°
    40% Chance of Rain
    Forecast night icon
    Day Details
    Mostly cloudy with a chance of rain in the morning then mostly cloudy with rain likely in the afternoon. Highs near 60.
    Night Details
    Mostly cloudy with a chance of rain. Chance of precipitation 35%. Low temperature around 51F. Dew point will be around 49F with an average humidity of 83%. Winds will be 4 mph from the S.
  • Forecast day icon
    Saturday
    40% Chance of Rain
    60°
    Forecast night icon
    Night
    30% Chance of Rain
    50°
    Saturday 9/30
    Day
    60°
    40% Chance of Rain
    Forecast day icon
    Night
    50°
    30% Chance of Rain
    Forecast night icon
    Day Details
    Cloudy with a chance of rain. Chance of precipitation 40%. High temperature around 60F. Dew point will be around 49F with an average humidity of 79%. Winds will be 5 mph from the SW.
    Night Details
    Partly cloudy with a slight chance of rain. Chance of precipitation 25%. Low temperature around 50F. Dew point will be around 48F with an average humidity of 81%. Winds will be 4 mph from the S.
  • Forecast day icon
    Sunday
    Partly Cloudy
    61°
    Forecast night icon
    Night
    Clear
    51°
    Sunday 10/1
    Day
    61°
    Partly Cloudy
    Forecast day icon
    Night
    51°
    Clear
    Forecast night icon
    Day Details
    Partly cloudy. High temperature around 61F. Dew point will be around 49F with an average humidity of 75%. Winds will be 5 mph from the SW.
    Night Details
    Clear. Low temperature around 51F. Dew point will be around 47F with an average humidity of 76%. Winds will be 4 mph from the S.
  • Forecast day icon
    Monday
    Mostly Cloudy
    62°
    Forecast night icon
    Night
    Clear
    52°
    Monday 10/2
    Day
    62°
    Mostly Cloudy
    Forecast day icon
    Night
    52°
    Clear
    Forecast night icon
    Day Details
    Mostly cloudy. High temperature around 62F. Dew point will be around 49F with an average humidity of 71%. Winds will be 6 mph from the SW.
    Night Details
    Clear. Low temperature around 52F. Dew point will be around 48F with an average humidity of 74%. Winds will be 4 mph from the S.