Washington Weather Alert: Seattle Faces Heavy Rain and Thunder Threat by Sunday, September 22

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Seattle, WA – A wet and stormy pattern arrives this weekend, with heavy rain and thunderstorms likely by Sunday morning across western Washington. Drivers should plan for slick pavement on I-5 and I-90, especially during the Sunday morning commute.

According to the National Weather Service, rain begins late Saturday evening and intensifies overnight. By early Sunday, showers could mix with thunderstorms across the Puget Sound, including Seattle, Bellevue, and Tacoma. Forecasters expect up to a quarter inch of rain by midday Sunday, though heavier amounts are possible in storms.

South winds will increase Saturday night, gusting up to 25 mph. That could bring scattered power outages and downed branches in King and Snohomish counties. Morning travelers should allow extra time and check road conditions before heading out.

Sunday afternoon brings a mix of showers and breaks, but lingering thunder remains possible until evening. High temperatures will hover in the mid-60s, cooler than recent sunny days. By Monday, skies clear and drier weather returns, offering a break after the weekend soaker.

Residents should charge devices, secure outdoor items, and avoid unnecessary travel during peak rainfall. Crews may need to respond quickly to flooding on low-lying roadways.

The unsettled pattern eases by midweek, though light rain may return Tuesday and Wednesday.

Warnings remain in effect through Sunday, with more updates expected as storm timing sharpens.

Five Day Forecast for Seattle, WA

  • Saturday: High 75, showers late, breezy.
  • Sunday: High 66, rain and thunderstorms, windy.
  • Monday: High 71, sunny and calm.
  • Tuesday: High 70, partly cloudy, slight chance of showers.
  • Wednesday: High 67, partly sunny, isolated rain possible.

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