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    • Tonight

      Sep 26

      47° Lo
      Clear
      • Ragweed Pollen
        • Ragweed Pollen
        • Grass Pollen
        • Tree Pollen
        • Mold
        • Dust & Dander
        • Air Quality Index
      • Ragweed Pollen
      • Weather
      • Grass Pollen: Low
      • Ragweed Pollen: Moderate
      • Tree Pollen: Low
      More
    • Tue

      Sep 27

      68° /48°
      Mostly sunny and breezy
      • Moderate
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Moderate
      • Tree Pollen: Low
      More
    • Wed

      Sep 28

      63° /52°
      Variable clouds with a shower
      • Moderate
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Moderate
      • Tree Pollen: Low
      More
    • Thu

      Sep 29

      70° /54°
      Partly sunny with a shower
      • Moderate
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Moderate
      • Tree Pollen: Low
      More
    • Fri

      Sep 30

      68° /56°F
      Clearing and spotty showers
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low

    Day

    68°Hi RealFeel® 68° Precipitation 67%
    Spotty showers; overcast in the morning, then intervals of clouds and sunshine in the afternoon
    • N 8 mph
    • Gusts: 13 mph
    • Max UV Index: 4 (Moderate)
    • Thunderstorms: 20%
    • Precipitation: 0.18 in
    • Rain: 0.18 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 3 hrs
    • Hours of Rain: 3 hrs

    Night

    56°Lo RealFeel® 52° Precipitation 60%
    Mostly cloudy with a couple of showers late
    • NNW 5 mph
    • Gusts: 8 mph
    • Max UV Index: N/A
    • Thunderstorms: 20%
    • Precipitation: 0.12 in
    • Rain: 0.12 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 2 hrs
    • Hours of Rain: 2 hrs

    Temperature History

    more Historical Weather Data >
      Today Normal Record 9/30/2015
    High 68° 71° 94° (1971) 68°
    Low 56° 47° 26° (1899) 42°

    Sunrise/Sunset

    • Sunrise: 6:52 AM
    • Sunset: 6:38 PM
    • Duration: 11:46 hr

    Moonrise/Moonset

    • Moonrise: 6:23 AM
    • Moonset: 6:43 PM
    • Duration: 12:20 hr
    Astronomy

    Ottawa Weather Report

    Chilly winds to howl across Great Lakes early this week

    September 26, 2016; 4:43 PM ET

    Gusty winds will accompany a push of chilly air across the Great Lakes through Tuesday. More >

    Fri. Dust & Dander

    Fri. Wind Maps