National Weather Service Forecast for: Crystal Lake IL
Issued by: National Weather Service Chicago, IL
Updated: 9:56 am CDT Apr 26, 2025
 
This
Afternoon
This Afternoon: Sunny, with a high near 57. North northeast wind around 10 mph, with gusts as high as 15 mph.
Sunny

 Tonight

Tonight: Patchy frost after midnight. Otherwise, mostly clear, with a low around 35. East northeast wind 5 to 10 mph.
Mostly Clear
then Patchy
Frost
 Sunday

Sunday: Mostly sunny, with a high near 66. East wind 5 to 10 mph becoming south southeast in the afternoon. Winds could gust as high as 20 mph.
Mostly Sunny

 Sunday
Night
Sunday Night: A 20 percent chance of showers after 1am. Mostly clear, with a low around 50. Southeast wind around 10 mph, with gusts as high as 15 mph.
Mostly Clear
then Slight
Chance
Showers
 Monday

Monday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 80. Breezy, with a south wind 10 to 20 mph, with gusts as high as 35 mph.
Slight Chance
Showers and
Breezy
 Monday
Night
Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Breezy. Chance of precipitation is 70%.
Showers
Likely and
Breezy
 Tuesday

Tuesday: A slight chance of showers before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm, then a slight chance of showers after 1pm. Mostly sunny, with a high near 72. Breezy. Chance of precipitation is 20%.
Slight Chance
T-storms and
Breezy
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 41.
Mostly Clear

 Wednesday

Wednesday: Mostly sunny, with a high near 61.
Mostly Sunny
Hi 57 °F Lo 35 °F Hi 66 °F Lo 50 °F Hi 80 °F Lo 63 °F Hi 72 °F Lo 41 °F Hi 61 °F

Hazardous Weather Outlook
 

This Afternoon
 
 Sunny, with a high near 57. North northeast wind around 10 mph, with gusts as high as 15 mph.
Tonight
 
 Patchy frost after midnight. Otherwise, mostly clear, with a low around 35. East northeast wind 5 to 10 mph.
Sunday
 
 Mostly sunny, with a high near 66. East wind 5 to 10 mph becoming south southeast in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
 
 A 20 percent chance of showers after 1am. Mostly clear, with a low around 50. Southeast wind around 10 mph, with gusts as high as 15 mph.
Monday
 
 A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 80. Breezy, with a south wind 10 to 20 mph, with gusts as high as 35 mph.
Monday Night
 
 Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Breezy. Chance of precipitation is 70%.
Tuesday
 
 A slight chance of showers before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm, then a slight chance of showers after 1pm. Mostly sunny, with a high near 72. Breezy. Chance of precipitation is 20%.
Tuesday Night
 
 Mostly clear, with a low around 41.
Wednesday
 
 Mostly sunny, with a high near 61.
Wednesday Night
 
 A chance of showers after 1am. Mostly cloudy, with a low around 45.
Thursday
 
 Showers likely. Mostly cloudy, with a high near 60.
Thursday Night
 
 A chance of showers. Mostly cloudy, with a low around 45.
Friday
 
 A chance of showers. Mostly sunny, with a high near 64.

 

Forecast from NOAA-NWS for Crystal Lake IL.