National Weather Service forecast

Mercer Island, Washington Weather

46°Overnight: Mostly Clear
Wind SSE 3 mph
7-DayHourlyRadar

Mercer Island 7-Day Forecast

  1. Overnight
    46°F
    Mostly Clear
    1% chance of precipitation

    Mostly clear, with a low around 46. South southeast wind around 3 mph.

  2. Wednesday
    58°F
    Partly Sunny then Chance Light Rain
    41% chance of precipitation

    A chance of rain after 4pm. Partly sunny. High near 58, with temperatures falling to around 56 in the afternoon. South wind 3 to 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.

  3. Wednesday Night
    51°F
    Light Rain
    89% chance of precipitation

    Rain before 4am. Mostly cloudy. Low around 51, with temperatures rising to around 53 overnight. South wind 7 to 15 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.

  4. Thursday
    58°F
    Partly Sunny
    5% chance of precipitation

    Partly sunny, with a high near 58. South southwest wind 6 to 13 mph.

  5. Thursday Night
    50°F
    Mostly Cloudy then Light Rain Likely
    63% chance of precipitation

    Rain likely after 4am. Mostly cloudy, with a low around 50. South southeast wind 6 to 10 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.

  6. Friday
    56°F
    Light Rain Likely
    74% chance of precipitation

    Rain likely. Cloudy, with a high near 56. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.

  7. Friday Night
    51°F
    Light Rain Likely
    67% chance of precipitation

    Rain likely. Cloudy, with a low around 51.

  8. Saturday
    62°F
    Chance Light Rain
    28% chance of precipitation

    A chance of rain. Mostly cloudy, with a high near 62.

  9. Saturday Night
    52°F
    Light Rain
    81% chance of precipitation

    Rain. Mostly cloudy, with a low around 52.

  10. Sunday
    57°F
    Light Rain Likely
    60% chance of precipitation

    Rain likely. Mostly cloudy, with a high near 57.

  11. Sunday Night
    45°F
    Slight Chance Light Rain
    15% chance of precipitation

    A slight chance of rain. Mostly cloudy, with a low around 45.

  12. Monday
    56°F
    Chance Light Rain
    39% chance of precipitation

    A chance of rain. Mostly cloudy, with a high near 56.

  13. Monday Night
    48°F
    Light Rain Likely
    55% chance of precipitation

    Rain likely. Mostly cloudy, with a low around 48.

  14. Tuesday
    59°F
    Light Rain Likely
    56% chance of precipitation

    Rain likely. Cloudy, with a high near 59.

Issued by the National Weather Service (SEW office), updated .

Mercer Island Hourly Forecast

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Mercer Island Weather Radar

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About Mercer Island

Population (2020 Census)
25,748
Coordinates
47.564, -122.231
Elevation
3 ft
NWS forecast office
SEW
Time zone
America/Los Angeles
Sunrise today
6:57 AM PST
Sunset today
4:47 PM PST
Daylight today
9 h 50 min

Mercer Island Weather Questions

What is the weather forecast for Mercer Island, Washington?

Overnight: Mostly clear, with a low around 46. South southeast wind around 3 mph. Wednesday: A chance of rain after 4pm. Partly sunny. High near 58, with temperatures falling to around 56 in the afternoon. South wind 3 to 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.

Will it rain or snow in Mercer Island this week?

The best chance of precipitation is Wednesday Night at 89%. Periods with a 30% chance or more: Wednesday (41%), Wednesday Night (89%), Thursday Night (63%), Friday (74%), Friday Night (67%), Saturday Night (81%), Sunday (60%), Monday (39%), Monday Night (55%), Tuesday (56%).

How warm and how cold will it get in Mercer Island this week?

The warmest day is Saturday, with a high near 62°F. The coldest night is Sunday Night, with a low near 45°F.

What time are sunrise and sunset in Mercer Island today?

Sunrise is at 6:57 AM PST and sunset is at 4:47 PM PST, for 9 h 50 min of daylight.

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