National Weather Service Forecast for: Crystal Lake IL
Issued by: National Weather Service Chicago, IL
Updated: 2:26 am CST Feb 2, 2026
 
Overnight

Overnight: Areas of freezing rain. Cloudy, with a low around 20. Southwest wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Areas
Freezing Rain

 Monday

Monday: Patchy freezing rain before 8am. Mostly cloudy, with a high near 25. West northwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Patchy
Freezing Rain
then Mostly
Cloudy
 Monday
Night
Monday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 13. West northwest wind around 5 mph, with gusts as high as 10 mph.
Mostly Cloudy
then Slight
Chance Snow
 Tuesday

Tuesday: Mostly sunny, with a high near 23. North wind 5 to 10 mph.
Mostly Sunny

 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 7. North wind around 5 mph becoming calm after midnight.
Mostly Clear

 Wednesday

Wednesday: Sunny, with a high near 24.
Sunny

 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 11.
Partly Cloudy

 Thursday

Thursday: Partly sunny, with a high near 31.
Partly Sunny

 Thursday
Night
Thursday Night: A chance of snow before midnight. Mostly cloudy, with a low around 29.
Chance Snow
then Mostly
Cloudy
Lo 20 °F Hi 25 °F Lo 13 °F Hi 23 °F Lo 7 °F Hi 24 °F Lo 11 °F Hi 31 °F Lo 29 °F

Special Weather Statement
 

Overnight
 
 Areas of freezing rain. Cloudy, with a low around 20. Southwest wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Monday
 
 Patchy freezing rain before 8am. Mostly cloudy, with a high near 25. West northwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Monday Night
 
 A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 13. West northwest wind around 5 mph, with gusts as high as 10 mph.
Tuesday
 
 Mostly sunny, with a high near 23. North wind 5 to 10 mph.
Tuesday Night
 
 Mostly clear, with a low around 7. North wind around 5 mph becoming calm after midnight.
Wednesday
 
 Sunny, with a high near 24.
Wednesday Night
 
 Partly cloudy, with a low around 11.
Thursday
 
 Partly sunny, with a high near 31.
Thursday Night
 
 A chance of snow before midnight. Mostly cloudy, with a low around 29.
Friday
 
 Partly sunny, with a high near 32.
Friday Night
 
 Partly cloudy, with a low around 10.
Saturday
 
 Mostly sunny, with a high near 22.
Saturday Night
 
 Mostly cloudy, with a low around 15.
Sunday
 
 Partly sunny, with a high near 28.

 

Forecast from NOAA-NWS for Crystal Lake IL.