National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Risks of Severe Thunderstorms and Excessive Rainfall; Fire Weather Concerns and Record Warmth

Severe thunderstorms and flash flooding risks increase across the center of the nation today. Meanwhile, ongoing thunderstorms and flash flooding will linger along the Gulf Coast states through the evening. The Great Basin and Intermountain West, warm temperatures and dry fuels with dry lightning may enhance fire weather potential. In addition, across interior Alaska, Red Flag Warning are posted. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

Lat: 47.49509°NLon: 122.21437°WElev: 23.0ft.

Overcast

61°F

16°C

Humidity 59%
Wind Speed SSW 8 MPH
Barometer 29.99 in (1015.58 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 20 Jun 09:20 AM PDT
Extended Forecast for

Mercer Island WA

  • Today

    Today: Partly sunny, then gradually becoming sunny, with a high near 77. South southwest wind 5 to 9 mph.

    High: 77 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 55. West southwest wind 5 to 8 mph becoming south after midnight.

    Low: 55 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 82. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 82 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 58. North northwest wind 5 to 7 mph becoming light and variable in the evening.

    Low: 58 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 89. Calm wind becoming north northwest 5 to 9 mph in the afternoon.

    High: 89 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

Detailed Forecast

Today
Partly sunny, then gradually becoming sunny, with a high near 77. South southwest wind 5 to 9 mph.
Tonight
Mostly clear, with a low around 55. West southwest wind 5 to 8 mph becoming south after midnight.
Sunday
Sunny, with a high near 82. Calm wind becoming north northwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 58. North northwest wind 5 to 7 mph becoming light and variable in the evening.
Monday
Sunny, with a high near 89. Calm wind becoming north northwest 5 to 9 mph in the afternoon.
Monday Night
Mostly clear, with a low around 63.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
A slight chance of rain. Mostly cloudy, with a low around 57.
Friday
A chance of rain. Mostly cloudy, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.56°N 122.18°W (Elev. 207 ft)
Last Update:
11:26 pm PDT Jun 19, 2026
Forecast Valid:
9am PDT Jun 20, 2026-6pm PDT Jun 26, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation