• Tonight

    Aug 31

    Lo 67°

    Mainly clear, warm; fog late

    Running Weather
    • Precip
      3%
    • Hours of Precip
      0
    • Wind
      Gust
      10 mph
  • Tue

    Sep 1

    88°Lo 68°

    Fog in the a.m.; mostly sunny

    Very Good for running
    • Precip
      8%
    • Hours of Precip
      0
    • Wind
      Gust
      13 mph
    more
  • Wed

    Sep 2

    89°Lo 67°

    Partly sunny, warm and humid

    Very Good for running
    • Precip
      9%
    • Hours of Precip
      0
    • Wind
      Gust
      9 mph
    more
  • Thu

    Sep 3

    89°Lo 66°

    Mostly sunny and very warm

    Very Good for running
    • Precip
      7%
    • Hours of Precip
      0
    • Wind
      Gust
      8 mph
    more
  • Fri

    Sep 4

    90°Lo 64°

    Mostly sunny and very warm

    Very Good for running
    • Precip
      7%
    • Hours of Precip
      0
    • Wind
      Gust
      9 mph
    more
Next Previous
Next 8 hours >
  Mon
12am
1am 2am 3am 4am 5am 6am 7am
  12am 1am 2am 3am 4am 5am 6am 7am
Forecast
Cloudy
Cloudy
Fog
Fog
Fog
Fog
Fog
Fog
Temp (°F) 64° 63° 62° 61° 60° 59° 61° 61°
RealFeel® 66° 65° 63° 61° 61° 60° 62° 62°
Humidity 93% 93% 93% 93% 93% 99% 100% 100%
   
  12am 1am 2am 3am 4am 5am 6am 7am
Rain
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
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0%
Ice
 
0%
 
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  12am 1am 2am 3am 4am 5am 6am 7am
Wind (mph) 2 N 1 N 2 N 1 N 1 N 1 N 2 N 2 NNW
UV Index 0 0 0 0 0 0 0 0
Cloud Cover 60% 55% 57% 60% 60% 60% 20% 0%
Dew Point 62° 61° 60° 59° 58° 59° 61° 61°
Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F

Temperature History - Aug 31

more Historical Weather Data >
  Today Normal Record 8/31/2014
High 85° 78° N/A 82°
Low 67° 55° N/A 57°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:17 AM with 13:12 of sunlight, then sets at 7:29 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 8:42 PM with 13:02 of moolight, then sets at 9:44 AM

Crystal Lake Weather Report

Chicago: More Foggy Mornings in Store as Heat Holds on

August 31, 2015; 7:25 PM ET

Chicagoans can expect to begin September with a stretch of higher temperatures, increasing humidity and more foggy mornings. more >

Avoid the Winter Workout Blues

Dec 26, 2012; 5:00 AM ET When it's snowing or cold, most of us want nothing more than to keep warm on the couch. But Violeta Yas has some tips to help you sneak in mini workouts at the office, regardless of the weather.