| National Weather Service Forecast for:
Crystal Lake IL Issued by: National Weather Service Chicago, IL |
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| Updated: 2:21 pm CST Dec 17, 2025 | ||||||||||||||||||
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| Tonight |
Drizzle likely, mainly after 5am. Increasing clouds, with a temperature rising to around 41 by 5am. South wind 5 to 15 mph, with gusts as high as 30 mph. |
| Thursday |
Rain and snow before 4pm, then a slight chance of snow after 5pm. Temperature rising to near 46 by 9am, then falling to around 30 during the remainder of the day. Breezy, with a south wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 100%. Little or no snow accumulation expected. |
| Thursday Night |
Scattered snow showers, mainly before 9pm, then a chance of flurries after midnight. Mostly cloudy, with a low around 9. Wind chill values as low as -9. Breezy, with a west wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 40%. |
| Friday |
Mostly sunny, with a high near 25. Wind chill values as low as -9. Blustery, with a west northwest wind 10 to 20 mph becoming southwest in the afternoon. Winds could gust as high as 30 mph. |
| Friday Night |
Mostly cloudy, with a low around 19. South wind 10 to 15 mph, with gusts as high as 25 mph. |
| Saturday |
A 20 percent chance of snow after noon. Mostly cloudy, with a high near 40. |
| Saturday Night |
Partly cloudy, with a low around 14. |
| Sunday |
Sunny, with a high near 28. |
| Sunday Night |
Mostly cloudy, with a low around 17. |
| Monday |
Mostly cloudy, with a high near 37. |
| Monday Night |
Mostly cloudy, with a low around 31. |
| Tuesday |
Partly sunny, with a high near 43. |
| Tuesday Night |
Mostly cloudy, with a low around 26. |
| Wednesday |
Partly sunny, with a high near 38. |
Forecast from NOAA-NWS for Crystal Lake IL.