Mercer Island, Washington | 10-Day Weather Forecasts & Weekend Weather | WeatherBug
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10 Day Forecast
  • Forecast day icon
    Thursday
    Sunny
    71°
    Forecast night icon
    Night
    Mostly Clear
    53°
    Thursday 5/9
    Day
    71°
    Sunny
    Forecast day icon
    Night
    53°
    Mostly Clear
    Forecast night icon
    Hourly
    Day Details
    Sunny. Highs in the upper 60s to mid 70s. North wind 10 to 15 mph.
    Night Details
    Mostly clear. Lows in the lower 50s. North wind 10 to 15 mph decreasing to 10 mph or less after midnight.
  • Forecast day icon
    Friday
    Sunny
    79°
    Forecast night icon
    Night
    Clear
    56°
    Friday 5/10
    Day
    79°
    Sunny
    Forecast day icon
    Night
    56°
    Clear
    Forecast night icon
    Hourly
    Day Details
    Sunny. Highs in the mid 70s to lower 80s. North wind to 10 mph.
    Night Details
    Clear. Lows in the lower to mid 50s. North wind 10 to 15 mph decreasing to 10 mph or less after midnight.
  • Forecast day icon
    Saturday
    Sunny
    80°
    Forecast night icon
    Night
    Clear
    55°
    Saturday 5/11
    Day
    80°
    Sunny
    Forecast day icon
    Night
    55°
    Clear
    Forecast night icon
    Hourly
    Day Details
    Sunny. Highs near 80. Light wind becoming northwest around 10 mph in the afternoon.
    Night Details
    Clear. Lows in the lower 50s.
  • Forecast day icon
    Sunday
    Mostly Sunny
    72°
    Forecast night icon
    Night
    Partly Cloudy
    52°
    Sunday 5/12
    Day
    72°
    Mostly Sunny
    Forecast day icon
    Night
    52°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Mostly sunny. Highs in the lower 70s.
    Night Details
    Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower 50s.
  • Forecast day icon
    Monday
    Partly Sunny
    62°
    Forecast night icon
    Night
    Mostly Cloudy
    50°
    Monday 5/13
    Day
    62°
    Partly Sunny
    Forecast day icon
    Night
    50°
    Mostly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Partly sunny. Highs in the mid to upper 60s.
    Night Details
    Mostly cloudy. Lows near 50.
  • Forecast day icon
    Tuesday
    Mostly Sunny
    67°
    Forecast night icon
    Night
    Partly Cloudy
    52°
    Tuesday 5/14
    Day
    67°
    Mostly Sunny
    Forecast day icon
    Night
    52°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Mostly sunny. Highs in the mid to upper 60s.
    Night Details
    Partly cloudy. Lows near 50.
  • Forecast day icon
    Wednesday
    Chance of Rain Showers
    71°
    Forecast night icon
    Night
    Mostly Cloudy
    49°
    Wednesday 5/15
    Day
    71°
    Chance of Rain Showers
    Forecast day icon
    Night
    49°
    Mostly Cloudy
    Forecast night icon
    Day Details
    Partly sunny with a slight chance of showers. Highs in the upper 60s.
    Night Details
    Mostly cloudy. Low temperature around 49F. Dew point will be around 45F with an average humidity of 66%. Winds will be 3 mph from the N.
  • Forecast day icon
    Thursday
    30% Chance of Rain
    63°
    Forecast night icon
    Night
    Cloudy
    48°
    Thursday 5/16
    Day
    63°
    30% Chance of Rain
    Forecast day icon
    Night
    48°
    Cloudy
    Forecast night icon
    Day Details
    Cloudy with a slight chance of rain. Chance of precipitation 25%. High temperature around 63F. Dew point will be around 46F with an average humidity of 68%. Winds will be 3 mph from the W.
    Night Details
    Cloudy. Low temperature around 48F. Dew point will be around 44F with an average humidity of 70%. Winds will be 2 mph from the NE.
  • Forecast day icon
    Friday
    Mostly Cloudy
    67°
    Forecast night icon
    Night
    Clear
    49°
    Friday 5/17
    Day
    67°
    Mostly Cloudy
    Forecast day icon
    Night
    49°
    Clear
    Forecast night icon
    Day Details
    Mostly cloudy. High temperature around 67F. Dew point will be around 44F with an average humidity of 57%. Winds will be 3 mph from the NW.
    Night Details
    Clear. Low temperature around 49F. Dew point will be around 42F with an average humidity of 63%. Winds will be 3 mph from the NE.
  • Forecast day icon
    Saturday
    Mostly Sunny
    67°
    Forecast night icon
    Night
    Clear
    50°
    Saturday 5/18
    Day
    67°
    Mostly Sunny
    Forecast day icon
    Night
    50°
    Clear
    Forecast night icon
    Day Details
    Mostly sunny. High temperature around 67F. Dew point will be around 45F with an average humidity of 56%. Winds will be 3 mph from the NW.
    Night Details
    Clear. Low temperature around 50F. Dew point will be around 45F with an average humidity of 67%. Winds will be 3 mph from the NE.