Forecast

    Forecast for Mercer Island, WA | Forecast Periods: 14
    Monday
    Mar 16
    2026

    Mercer Island, WA

    Updated: 8:00 AM PDT

    57°F

    Slight Chance Light Rain

    9 mph SSW
    Precipitation: 15%

    A slight chance of rain before 2pm. Cloudy, with a high near 57. South southwest wind around 9 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.

    Hourly Forecast

    MON13:00
    52°F
    Slight Chance Light Rain
    Dewpoint:9.4°Precip:15%Humidity:91%Wind:9 mph S
    MON14:00
    54°F
    Cloudy
    Dewpoint:10.6°Precip:11%Humidity:89%Wind:9 mph S
    MON15:00
    55°F
    Cloudy
    Dewpoint:10.6°Precip:9%Humidity:85%Wind:9 mph SSW
    MON16:00
    55°F
    Mostly Cloudy
    Dewpoint:10°Precip:8%Humidity:83%Wind:9 mph SSW
    TUE17:00
    57°F
    Cloudy
    Dewpoint:10.6°Precip:12%Humidity:81%Wind:8 mph SSW
    TUE18:00
    56°F
    Cloudy
    Dewpoint:10.6°Precip:9%Humidity:82%Wind:8 mph S
    TUE19:00
    55°F
    Cloudy
    Dewpoint:10°Precip:6%Humidity:84%Wind:8 mph SSW
    TUE20:00
    55°F
    Slight Chance Light Rain
    Dewpoint:10.6°Precip:17%Humidity:86%Wind:7 mph SSW
    TUE21:00
    53°F
    Chance Light Rain
    Dewpoint:9.4°Precip:27%Humidity:86%Wind:8 mph S
    TUE22:00
    53°F
    Chance Light Rain
    Dewpoint:10°Precip:36%Humidity:88%Wind:8 mph S
    TUE23:00
    53°F
    Chance Light Rain
    Dewpoint:10°Precip:44%Humidity:88%Wind:8 mph S
    TUE00:00
    53°F
    Light Rain Likely
    Dewpoint:10°Precip:56%Humidity:89%Wind:9 mph S
    TUE01:00
    52°F
    Light Rain
    Dewpoint:9.4°Precip:76%Humidity:89%Wind:9 mph S
    TUE02:00
    52°F
    Light Rain Likely
    Dewpoint:9.4°Precip:68%Humidity:88%Wind:9 mph S
    TUE03:00
    52°F
    Light Rain Likely
    Dewpoint:9.4°Precip:66%Humidity:89%Wind:9 mph S
    TUE04:00
    52°F
    Light Rain Likely
    Dewpoint:10°Precip:70%Humidity:92%Wind:10 mph S
    TUE05:00
    52°F
    Light Rain
    Dewpoint:10°Precip:93%Humidity:92%Wind:10 mph S
    TUE06:00
    51°F
    Light Rain
    Dewpoint:9.4°Precip:93%Humidity:92%Wind:10 mph S
    TUE07:00
    51°F
    Light Rain
    Dewpoint:9.4°Precip:93%Humidity:92%Wind:10 mph S
    TUE08:00
    51°F
    Light Rain
    Dewpoint:9.4°Precip:93%Humidity:93%Wind:10 mph S
    TUE09:00
    52°F
    Light Rain
    Dewpoint:10°Precip:93%Humidity:92%Wind:10 mph S
    TUE10:00
    52°F
    Light Rain
    Dewpoint:10°Precip:93%Humidity:92%Wind:10 mph S
    TUE11:00
    52°F
    Light Rain
    Dewpoint:10°Precip:95%Humidity:92%Wind:9 mph S
    TUE12:00
    52°F
    Light Rain
    Dewpoint:10°Precip:95%Humidity:93%Wind:9 mph S

    Extended Forecast

    Tonight

    Tue, Mar 17
    51°F
    Light Rain
    7 mph S
    Precipitation: 93%
    Rain after 8pm. Cloudy, with a low around 51. South wind 7 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.

    Tuesday

    Tue, Mar 17
    56°F
    Light Rain
    10 mph S
    Precipitation: 95%
    Rain. Cloudy, with a high near 56. South wind around 10 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Tuesday Night

    Wed, Mar 18
    53°F
    Light Rain
    9 mph S
    Precipitation: 95%
    Rain. Cloudy, with a low around 53. South wind around 9 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Wednesday

    Wed, Mar 18
    57°F
    Light Rain
    9 mph S
    Precipitation: 95%
    Rain. Cloudy, with a high near 57. South wind around 9 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Wednesday Night

    Thu, Mar 19
    54°F
    Light Rain
    8 mph S
    Precipitation: 92%
    Rain. Cloudy, with a low around 54. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.

    Thursday

    Thu, Mar 19
    59°F
    Light Rain
    9 mph S
    Precipitation: 90%
    Rain. Cloudy, with a high near 59.

    Thursday Night

    Fri, Mar 20
    53°F
    Light Rain
    6 mph SSW
    Precipitation: 87%
    Rain. Cloudy, with a low around 53.

    Friday

    Fri, Mar 20
    57°F
    Light Rain
    7 mph SSW
    Precipitation: 76%
    Rain. Cloudy, with a high near 57.

    Friday Night

    Sat, Mar 21
    44°F
    Light Rain Likely
    7 mph SSE
    Precipitation: 57%
    Rain likely. Mostly cloudy, with a low around 44.

    Saturday

    Sat, Mar 21
    53°F
    Chance Light Rain
    7 mph SSW
    Precipitation: 42%
    A chance of rain. Partly sunny, with a high near 53.

    Saturday Night

    Sun, Mar 22
    40°F
    Slight Chance Light Rain
    3 mph S
    Precipitation: 23%
    A slight chance of rain. Partly cloudy, with a low around 40.

    Sunday

    Sun, Mar 22
    54°F
    Chance Light Rain
    3 mph N
    Precipitation: 30%
    A chance of rain. Mostly sunny, with a high near 54.

    Sunday Night

    Mon, Mar 23
    41°F
    Chance Light Rain
    7 mph NNE
    Precipitation: 39%
    A chance of rain. Mostly cloudy, with a low around 41.

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