• Today

    Sep 18

    69°Lo 50°

    Mostly sunny and pleasant

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

    Sep 19

    73°Lo 60°

    Intervals of clouds and sun

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

    Sep 20

    81°Lo 59°

    A couple of p.m. t-storms

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

    Sep 21

    72°Lo 47°

    Clouds breaking; less humid

    Low ragweed pollen levels
    • Precip
      25%
    • Wind
      Speed
      10 mph
    • Cloud
      Cover
      54%
  • Mon

    Sep 22

    66°Lo 45°

    Times of clouds and sun

    Ragweed Pollen Weather
    • Precip
      25%
    • Wind
      Speed
      6 mph
    • Cloud
      Cover
      50%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Sun
9am
10am 11am 12pm 1pm 2pm 3pm 4pm
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Forecast
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Sunny
Mostly Sunny
Mostly Sunny
Temp (°F) 61° 64° 66° 68° 70° 71° 72° 70°
RealFeel® 57° 61° 65° 67° 69° 71° 71° 68°
Humidity 82% 75% 68% 61% 55% 53% 52% 54%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Rain
 
3%
 
3%
 
3%
 
3%
 
4%
 
7%
 
7%
 
7%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Wind (mph) 10 WNW 10 NW 11 NW 11 NW 12 NW 11 NW 11 NW 10 NW
UV Index 1 2 3 4 4 4 4 2
Cloud Cover 76% 76% 76% 76% 76% 26% 26% 26%
Dew Point 56° 56° 55° 54° 53° 53° 53° 53°
Middle Grid line 75 F Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F

Temperature History - Sep 21

more Historical Weather Data >
  Today Normal Record 9/21/2013
High 72° 70° N/A 60°
Low 47° 46° N/A 43°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:39 AM with 12:14 of sunlight, then sets at 6:53 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:11 AM with 13:19 of moolight, then sets at 5:30 PM

Top Story

Crystal Lake Weather Report

Chicago: Cooler, Fall-Like Temperatures to Linger

September 17, 2014; 1:12 PM ET

The cooler, below-average conditions responsible for the fall-like feel will hold through the end of the week over the Chicago area. more >

Sun. Dust & Dander

Sun. Wind Maps