| NWS Forecast for: Crystal Lake IL Issued by: National Weather Service Chicago, IL Last Update: 1:21 pm CDT May 20, 2026 | |
This Afternoon: Sunny, with a high near 61. East northeast wind 10 to 15 mph, with gusts as high as 20 mph. Tonight: Mostly clear, with a low around 42. Northeast wind 10 to 15 mph. Thursday: Partly sunny, with a high near 59. East northeast wind 10 to 15 mph, with gusts as high as 20 mph. Thursday Night: Partly cloudy, with a low around 44. East northeast wind 10 to 15 mph. Friday: A 30 percent chance of showers after 1pm. Mostly cloudy, with a high near 62. East wind around 15 mph, with gusts as high as 25 mph. Friday Night: Showers. Low around 50. Chance of precipitation is 80%. Saturday: Mostly cloudy, with a high near 72. Saturday Night: Mostly cloudy, with a low around 52. Sunday: Partly sunny, with a high near 77. Sunday Night: Partly cloudy, with a low around 54. Memorial Day: Mostly sunny, with a high near 80. Monday Night: Partly cloudy, with a low around 56. Tuesday: Partly sunny, with a high near 82. | |
| Crystal Lake IL 42.23°N 88.36°W | |
Visit your local NWS office at: https://www.weather.gov/lot |