National Weather Service Forecast for: Crystal Lake IL
Issued by: National Weather Service Chicago, IL
Updated: 3:07 pm CDT Jul 12, 2025
 
This
Afternoon
This Afternoon: A 20 percent chance of showers after 4pm.  Mostly sunny, with a high near 82. West wind around 10 mph, with gusts as high as 15 mph.
Slight Chance
Showers
Tonight

Tonight: A 10 percent chance of showers before 7pm.  Mostly clear, with a low around 61. West northwest wind 5 to 10 mph.
Slight Chance
Showers then
Mostly Clear
Sunday

Sunday: Mostly sunny, with a high near 82. Light west wind increasing to 5 to 10 mph in the morning.
Mostly Sunny

Sunday
Night
Sunday Night: Mostly clear, with a low around 63. West wind around 5 mph becoming calm  in the evening.
Mostly Clear

Monday

Monday: Sunny, with a high near 87. Southwest wind 5 to 10 mph.
Sunny

Monday
Night
Monday Night: Mostly clear, with a low around 68.
Mostly Clear

Tuesday

Tuesday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 86.
Sunny then
Slight Chance
T-storms
Tuesday
Night
Tuesday Night: A chance of showers after 1am.  Partly cloudy, with a low around 69.
Partly Cloudy
then Chance
Showers
Wednesday

Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm.  Partly sunny, with a high near 84.
Showers
Likely
Hi 82 °F Lo 61 °F Hi 82 °F Lo 63 °F Hi 87 °F Lo 68 °F Hi 86 °F Lo 69 °F Hi 84 °F

Hazardous Weather Outlook
 

This Afternoon
 
A 20 percent chance of showers after 4pm. Mostly sunny, with a high near 82. West wind around 10 mph, with gusts as high as 15 mph.
Tonight
 
A 10 percent chance of showers before 7pm. Mostly clear, with a low around 61. West northwest wind 5 to 10 mph.
Sunday
 
Mostly sunny, with a high near 82. Light west wind increasing to 5 to 10 mph in the morning.
Sunday Night
 
Mostly clear, with a low around 63. West wind around 5 mph becoming calm in the evening.
Monday
 
Sunny, with a high near 87. Southwest wind 5 to 10 mph.
Monday Night
 
Mostly clear, with a low around 68.
Tuesday
 
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86.
Tuesday Night
 
A chance of showers after 1am. Partly cloudy, with a low around 69.
Wednesday
 
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 84.
Wednesday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Thursday
 
A chance of showers and thunderstorms. Mostly cloudy, with a high near 80.
Thursday Night
 
Mostly cloudy, with a low around 62.
Friday
 
Partly sunny, with a high near 78.

 

Forecast from NOAA-NWS for Crystal Lake IL.