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Sparta, IL Weather Forecast
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Sparta Weather Forecast
| OVERNIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | SATURDAY | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  |  |  | | | | | | | |
| Clear | Sunny | Chance of T-Storm | Chance of T-Storm | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Lo: 69°FLo: 21°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C |
| POP: 40% | POP: 20% | POP: 20% | POP: 30% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1017 PM CDT Mon Sep 14 2026 
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Issued: 1058 PM CDT Mon Sep 14 2026
Key Messages
- Unseasonably hot and humid weather is expected this week with heat index values reaching 105F+ on Tuesday mainly south of I-70.
- Scattered showers and thunderstorms are forecast on Tuesday. A few may be strong to marginally severe with gusty winds the main threat.
Aviation
/00Z TAFS THROUGH 06Z WEDNESDAY/... Issued at 1057 PM CDT Mon Sep 14 2026
VFR conditions will continue through the night. There will be some LLWS for the UIN terminal as a result of a southwesterly low-level jet. An ou...