Frog Lake, IL Weather Forecast
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Frog Lake Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
| Chance of Showers | Chance of Showers | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Partly Sunny | Partly Cloudy | Partly Cloudy |
| Lo: 59°FLo: 15°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C Lo: 51°FLo: 11°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C |
| POP: 20% | POP: 20% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 752 PM CDT Mon Sep 21 2026 

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Issued: 558 PM CDT Mon Sep 21 2026
Key Messages
- Cooler weather will prevail this week as high temperatures range from the 60s to 70s.
Discussion
... Issued at 144 PM CDT Mon Sep 21 2026
Water vapor imagery early this afternoon shows an upper low spinning over eastern Nebraska/western Iowa with ridging on both sides of it. At the surface, a cold/stationary front is draped from the Mid- Atlantic states westward into Arkansas with high pressure centered over Ontario. Widespread cloud cover will remain in place through at least Tuesday m...
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