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Mendon, IL Weather Forecast
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Mendon Weather Forecast
| REST OF TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
 |  | |  | | | | | | |  |  |
| Sunny | Partly Cloudy | Sunny | Mostly Clear | Sunny | Partly Cloudy | Mostly Clear | Mostly Clear | Mostly Sunny | Mostly Clear | Chance of T-Storm | Chance of T-Storm |
| Hi: 99°FHi: 37°C | Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 90°FHi: 32°C Lo: 70°FLo: 21°C | Hi: 90°FHi: 32°C Lo: 70°FLo: 21°C | Hi: 95°FHi: 35°C | Lo: 79°FLo: 26°C | Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C |
| POP: 20% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 927 AM CDT Fri Sep 04 2026 
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Issued: 500 AM CDT Fri Sep 4 2026
Key Messages
- A late summer heatwave will continue through Saturday before temperatures cool slightly Sunday into Labor Day.
- Another period of heat and near-record breaking temperatures is forecast Tuesday into Wednesday, but it is uncertain how long the heat persists thereafter.
Aviation
/06Z TAFS THROUGH 12Z SATURDAY/... Issued at 455 AM CDT Fri Sep 4 2026
Dry and VFR flight conditions are favored to persist through the TAF period along with light winds. A few isolated showers or thunderstorms cann...