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West Union, IL Weather Forecast
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West Union Weather Forecast
| REST OF TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY |
 |  |  | | | | | | | | | |
| Chance of Showers | Sunny | Clear | Sunny | Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Clear | Mostly Clear | Mostly Clear |
| Lo: 39°FLo: 4°C | Hi: 59°FHi: 15°C | Lo: 31°FLo: -1°C | Hi: 65°FHi: 18°C | Lo: 35°FLo: 2°C | Hi: 70°FHi: 21°C | Hi: 75°FHi: 24°C Lo: 41°FLo: 5°C | Hi: 75°FHi: 24°C Lo: 41°FLo: 5°C | Hi: 75°FHi: 24°C Lo: 41°FLo: 5°C | Lo: 45°FLo: 7°C | Hi: 79°FHi: 26°C Lo: 49°FLo: 9°C | Hi: 79°FHi: 26°C Lo: 49°FLo: 9°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 902 PM CDT Fri Oct 16 2026 
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Meteorlogic Glosserator
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Issued: 622 PM CDT Fri Oct 16 2026
Key Messages
- A Frost Advisory is in effect tonight along and west of a Lacon...to Lincoln...to Taylorville line.
- Frost will be likely across all of central and southeast Illinois Saturday night as winds become nearly calm. Sensitive outdoor plants need to be protected this weekend in order to avoid damage.
Discussion
... Issued at 157 PM CDT Fri Oct 16 2026
18z/1pm surface analysis shows a 998mb low over southern Quebec with a cold front extending southward to the Gulf Coast. Meanwhile a sprawling 1...