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Calvin, IL Weather Forecast
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Calvin Weather Forecast
| THIS AFTERNOON | TONIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  | |  | | | |  |  | | |  |
| Sunny | Mostly Clear | Sunny | Partly Cloudy | Sunny | Mostly Clear | Mostly Clear | Showers Likely | Chance of T-Storm | Clearing | Sunny | Chance of Showers |
| Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 95°FHi: 35°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C |
| POP: 60% | POP: 70% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 152 PM CDT Sun Sep 06 2026 
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Issued: 144 PM CDT Sun Sep 6 2026
Key Messages
- A Heat Advisory remains in effect till 8 PM for areas south of a line from Greenville, MO to Murray, KY for heat indices over 100 degrees.
- Tomorrow (Labor Day) still looks to be the best day so far with highs right around 90 and dew points in the mid to upper 50s.
- Heat indices climb into the 100-105 degree range again on Wednesday afternoon.
- Widespread showers and storms are possible Wednesday night through Thursday with a 70% chance up north to a 30% chance down south. Conditions po...