• Sun

    Aug 16

    77°Lo 59°

    Periods of rain

    Hair Frizz Weather
    • Wind
      Gust
      21 mph
    • Precip
      64%
    • Hours of Precip
      3.5
    more
  • Mon

    Aug 17

    75°Lo 65°

    Mostly cloudy with a shower

    Hair Frizz Weather
    • Wind
      Gust
      9 mph
    • Precip
      55%
    • Hours of Precip
      1
    more
  • Tue

    Aug 18

    77°Lo 65°

    Mainly cloudy and less humid

    Hair Frizz Weather
    • Wind
      Gust
      7 mph
    • Precip
      25%
    • Hours of Precip
      0
  • Wed

    Aug 19

    77°Lo 62°

    Brilliant sunshine

    Hair Frizz Weather
    • Wind
      Gust
      10 mph
    • Precip
      10%
    • Hours of Precip
      0
    more
  • Thu

    Aug 20

    77°Lo 61°

    Cloudy

    Hair Frizz Weather
    • Wind
      Gust
      12 mph
    • Precip
      25%
    • Hours of Precip
      0
    more
Next Previous
Hi 77° RealFeel® 81° Precipitation 25%

Day

N

E

S

W

  • ESE 4 mph
  • Gusts: 7 mph

Mainly cloudy and less humid

  • Max UV Index: 6 (High)
  • Thunderstorms: 0%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 65° RealFeel® 64° Precipitation 20%

Night

N

E

S

W

  • ESE 5 mph
  • Gusts: 8 mph

Clear to partly cloudy

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

Temperature History - Aug 18

more Historical Weather Data >
  Today Normal Record 8/18/2014
High 77° 80° N/A 81°
Low 65° 58° N/A 58°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:03 AM with 13:47 of sunlight, then sets at 7:50 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 9:53 AM with 11:51 of moolight, then sets at 9:44 PM

Crystal Lake Weather Report

Chicago: Cooler Weather to Move in Midweek

August 1, 2015; 11:04 AM ET

After a warm start to the week, a trend toward cooler temperatures can be expected. more >

The History Behind the UV Index

Nov 12, 2012; 5:00 AM ET The UV index has been around since the early 1990s. It was created to help you plan outdoor activities in hopes to limit overexposure to the sun. Jeannette Calle has more.