Washington Weather Alert: Haze and Heat Push Seattle to 85°F Tuesday, September 16

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Seattle, Wash. – Hazy skies will cover Seattle by Tuesday morning, bringing air quality concerns and afternoon highs climbing near 85 degrees. Drivers along I-5 should prepare for reduced visibility during the morning commute as the haze lingers before sunshine dominates the afternoon.

According to the National Weather Service in Seattle, light winds and stagnant air will allow haze to build early Tuesday before shifting east. Temperatures will stay well above average, with King County expecting one of its warmest mid-September days in recent years. Residents should limit strenuous outdoor activity until conditions improve by late afternoon.

Seattle neighborhoods, including Capitol Hill, Ballard, and West Seattle, may notice heavier morning haze, while areas near Puget Sound could see slower clearing. Travelers should check road conditions along I-90 and Highway 520 where haze could create patchy visibility issues. Officials recommend using headlights during morning hours and avoiding unnecessary trips if air quality worsens.

By Wednesday, temperatures will ease back into the mid-70s under mostly sunny skies. Thursday continues the mild stretch with highs near 71 before changes arrive by the weekend. Light rain could return to the region Saturday into Sunday, signaling the first push of fall weather systems.

Warnings remain limited, but officials stress staying alert for potential weekend advisories as fall storm patterns return.

Five-Day Forecast for Seattle, Washington

  • Tuesday: Haze early, sunny later. High 85°F, low 59°F.
  • Wednesday: Sunny, high 76°F, low 56°F.
  • Thursday: Mostly sunny, high 71°F, low 56°F.
  • Friday: Sunny, high 73°F, low 57°F.
  • Saturday: Chance of rain, high 72°F, low 58°F.