• Tonight

    Aug 31

    Lo 67°

    Clear and warm; fog late

    Beach & Pool Weather
    • UV
      4 - Moderate
    • Cloud
      Cover
      55%
    • Precip
      3%
  • Tue

    Sep 1

    88°Lo 68°

    Fog in the a.m.; mostly sunny

    Very Good at the beach or pool
    • UV
      5 - High
    • Cloud
      Cover
      11%
    • Precip
      8%
    more
  • Wed

    Sep 2

    89°Lo 67°

    Partly sunny, warm and humid

    Excellent at the beach or pool
    • UV
      5 - High
    • Cloud
      Cover
      26%
    • Precip
      9%
    more
  • Thu

    Sep 3

    89°Lo 66°

    Mostly sunny and very warm

    Excellent at the beach or pool
    • UV
      5 - High
    • Cloud
      Cover
      23%
    • Precip
      7%
    more
  • Fri

    Sep 4

    90°Lo 64°

    Mostly sunny and very warm

    Excellent at the beach or pool
    • UV
      5 - High
    • Cloud
      Cover
      18%
    • Precip
      7%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Mon
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  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Forecast
Hazy
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Hazy
Hazy
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Hazy
Hazy
Temp (°F) 66° 71° 75° 78° 81° 83° 85° 84°
RealFeel® 69° 76° 82° 85° 88° 90° 90° 87°
Humidity 87% 79% 71% 61% 54% 50% 50% 50%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Rain
 
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Snow
 
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  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Wind (mph) 1 N 1 N 2 S 2 WNW 4 SSW 5 SSW 6 SW 7 SSW
UV Index 1 2 3 4 4 5 4 3
Cloud Cover 71% 80% 85% 82% 64% 40% 62% 52%
Dew Point 62° 64° 65° 63° 63° 62° 64° 64°
Middle Grid line 90 F Middle Grid line 85 F Middle Grid line 80 F Middle Grid line 75 F Middle Grid line 70 F Middle Grid line 65 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; 9:17 PM ET

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

What's that Warning? Warnings at the Beach

Jul 25, 2012; 5:00 AM ET If you're headed to the beach, keep an eye out for any of these watches and warnings issued by the NWS.

Mon. Beach & Pool

Mon. UV Index

Mon. Wind Maps