• Friday

    Sep 19

    72°Lo 55°

    Clouds giving way to some sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      73°
    • UV
      3 - Moderate
    • Cloud
      Cover
      67%
    more
  • Saturday

    Sep 20

    75°Lo 56°

    Sunshine and patchy clouds

    Beneficial weather for migraines
    • Hi
      RealFeel
      73°
    • UV
      4 - Moderate
    • Cloud
      Cover
      25%
    more
  • Sunday

    Sep 21

    84°Lo 60°

    Mostly sunny and warmer

    Beneficial weather for migraines
    • Hi
      RealFeel
      84°
    • UV
      4 - Moderate
    • Cloud
      Cover
      11%
    more
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Mercer Island Weather Report

Seattle: Cooler Weather to Fade for Weekend Heat

September 18, 2014; 4:20 PM ET

After a stretch of above-normal high temperatures, cooler, more seasonable weather is expected in Seattle for the remainder of the week, but it will be short-lived as heat returns to the region this weekend. more >

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Fri. UV Index