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Crystal Lake, OH Weather Forecast
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Crystal Lake Weather Forecast
| THIS AFTERNOON | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  |  | |  |  |  | | | |  |  |
| Mostly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Clear | Mostly Sunny | Mostly Clear | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy |
| Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C |
| POP: 90% | POP: 90% | POP: 90% | POP: 50% | POP: 70% | POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 233 PM EDT Sat Aug 15 2026 
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Crystal Lake Forecast Discussion
Issued: 235 PM EDT Sat Aug 15 2026
Key Messages
1) An active weather pattern is expected through the next 36 hours with several rounds of heavy rain and thunderstorms. Heavy rain may produce flash flooding through Sunday night. Thunderstorms could be strong to severe, primarily on Sunday, with the potential for gusty to damaging wind gusts or a tornado or two.
2) The next window for showers and storms will be on Wednesday with a strong cold front.
Discussion
... KEY MESSAGE 1... Some shower activity is m...