• Tonight

    Sep 20

    Lo 58°

    An evening t-storm in spots

    Ragweed Pollen Weather
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      0 - Low
  • Sun

    Sep 21

    68°Lo 45°

    Clouds breaking; not as warm

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      0 - Low
    more
  • Mon

    Sep 22

    69°Lo 46°

    Sunshine and patchy clouds

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      0 - Low
    more
  • Tue

    Sep 23

    73°Lo 48°

    Mostly sunny and pleasant

    Low ragweed pollen levels
    • Precip
      5%
    • Wind
      Speed
      3 mph
    • Cloud
      Cover
      11%
    more
  • Wed

    Sep 24

    75°Lo 50°

    Sunny and pleasant

    Ragweed Pollen Weather
    • Precip
      10%
    • Wind
      Speed
      5 mph
    • Cloud
      Cover
      10%
    more
Next Previous
Hi 79° RealFeel® 81° Precipitation 55%

Day

N

E

S

W

  • WSW 9 mph
  • Gusts: 24 mph

Mostly cloudy and more humid with a thunderstorm in spots; thunderstorms can bring damaging winds

  • Max UV Index: 4 (Moderate)
  • Thunderstorms: 60%
  • Precipitation: 0.22 in
  • Rain: 0.22 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 2 hrs
  • Hours of Rain: 2 hrs
Lo 58° RealFeel® 51° Precipitation 50%

Night

N

E

S

W

  • W 7 mph
  • Gusts: 14 mph

A shower or thunderstorm in spots late this evening; partly cloudy

  • Max UV Index: N/A
  • Thunderstorms: 60%
  • Precipitation: 0.05 in
  • Rain: 0.05 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0.5 hrs
  • Hours of Rain: 0.5 hrs

Ottawa Pollen Levels - September 20

  • Extreme
  • Very High
  • High
  • Moderate
  • Low
  • Grass

    Pollen

    Low

  • Weed

    Pollen

    Low

  • Tree

    Pollen

    Low

  • Mold

    Pollen

    Low

Temperature History - Sep 20

more Historical Weather Data >
  Today Normal Record 9/20/2013
High 79° 75° 95° (1908) 71°
Low 58° 52° 32° (1937) 50°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:41 AM with 12:15 of sunlight, then sets at 6:56 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 3:19 AM with 13:42 of moolight, then sets at 5:01 PM

Top Story

Ottawa Weather Report

Chicago: Thunderstorms to Precede More Cool Air

September 20, 2014; 4:28 AM ET

Chicago is facing the threat of some disruptive thunderstorms on Saturday. more >

Sat. Pollen

Sat. Dust & Dander

Sat. Wind Maps