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Crystal Lake Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  | |  |  | | | | | | |  |
| Clear | Sunny | Clear | Partly Cloudy | Clearing | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Chance of Showers |
| Lo: 39°FLo: 4°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C |
| POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 232 AM EDT Tue Oct 06 2026 
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Issued: 315 AM EDT Tue Oct 6 2026
Key Messages
1) The nice fall weather pattern will continue through this week with warmer and above average temperatures expected later this week and weekend.
Discussion
... KEY MESSAGE 1... The current weather pattern over the Upper Ohio Valley and Lower Great Lakes region is a general west-northwest flow aloft. This pattern will continue to favor a mostly dry forecast with occasional wind shifts or weak cold fronts passing through which will seesaw our temperatures at times later this week. High ...