• Mon

    May 18

    79°Lo 60°

    A shower in the afternoon

    Watch for hair frizz
    • Wind
      Gust
      29 mph
    • Precip
      58%
    • Hours of Precip
      1
    more
  • Tue

    May 19

    71°Lo 56°

    A little afternoon rain

    Hair Frizz Weather
    • Wind
      Gust
      17 mph
    • Precip
      55%
    • Hours of Precip
      1
    more
  • Wed

    May 20

    72°Lo 56°

    Periods of rain

    Hair Frizz Weather
    • Wind
      Gust
      8 mph
    • Precip
      72%
    • Hours of Precip
      11.5
  • Thu

    May 21

    71°Lo 57°

    Spotty morning showers

    Hair Frizz Weather
    • Wind
      Gust
      9 mph
    • Precip
      60%
    • Hours of Precip
      1
    more
  • Fri

    May 22

    74°Lo 56°

    Cloudy with a little rain

    Hair Frizz Weather
    • Wind
      Gust
      10 mph
    • Precip
      57%
    • Hours of Precip
      3
    more
Next Previous
Hi 72° RealFeel® 81° Precipitation 72%

Day

N

E

S

W

  • NE 4 mph
  • Gusts: 8 mph

Periods of rain

  • Max UV Index: 7 (High)
  • Thunderstorms: 14%
  • Precipitation: 0.6 in
  • Rain: 0.6 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 8 hrs
  • Hours of Rain: 8 hrs
Lo 56° RealFeel® 55° Precipitation 75%

Night

N

E

S

W

  • E 5 mph
  • Gusts: 8 mph

Cloudy with rain ending, then a leftover shower

  • Max UV Index: N/A
  • Thunderstorms: 20%
  • Precipitation: 0.3 in
  • Rain: 0.3 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 3.5 hrs
  • Hours of Rain: 3.5 hrs

Temperature History - May 20

more Historical Weather Data >
  Today Normal Record 5/20/2014
High 72° 68° N/A 83°
Low 56° 46° N/A 57°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:28 AM with 14:44 of sunlight, then sets at 8:12 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 7:50 AM with 14:49 of moolight, then sets at 10:39 PM

Crystal Lake Weather Report

Chicago: Temperature Roller Coaster in Store for New Week

May 3, 2015; 11:27 AM ET

The month of May has opened the door for warm air to flow into the Chicago area following a cool end to April. 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.