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Allendale, IL Weather Forecast
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Allendale Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | FRIDAY | SATURDAY |
 |  |  |  |  |  |  | | | |
| Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Mostly Cloudy | Partly Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 95°FHi: 35°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°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 | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C |
| POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 757 AM CDT Sun Sep 20 2026 
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Issued: 632 AM CDT Sun Sep 20 2026
Key Messages
- The Heat Advisory remains in effect until early this evening, with high temperatures again reaching the middle to upper 90s this afternoon.
- A cold front will move through our region late today and tonight, allowing much cooler air to gradually filter into our region for the beginning of the work week.
- Temperatures by Tuesday into Tuesday night will be near to a little below seasonal normals, with these conditions persisting the rest of the week and into next weekend.
- 30-60% chances o...