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Teheran, IL Weather Forecast
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Teheran Weather Forecast
| TODAY | TONIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY |
 |  | | | |  | |  | | | | |
| Mostly Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Partly Cloudy | Mostly Sunny | Chance of T-Storm | Mostly Sunny | Mostly Clear | Mostly Clear | Mostly Sunny |
| Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Hi: 85°FHi: 29°C Lo: 60°FLo: 16°C | Hi: 85°FHi: 29°C Lo: 60°FLo: 16°C | Hi: 89°FHi: 32°C |
| POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 337 AM CDT Sun Sep 06 2026 
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Issued: 134 AM CDT Sun Sep 6 2026
Key Messages
- Welcomed relief is in store for today and Monday, with high temperatures in the 80s for most locations and dropping heat indices into the 80s, near 90.
- High heat and humidity return Tuesday and Wednesday. Wednesday looks to be the hottest, bringing another risk for triple- digit heat index values. There is a 20-30% chance of heat indices greater than 100 degrees south of I-70 Wednesday afternoon.
Discussion
... Issued at 134 AM CDT Sun Sep 6 2026
A backdoor cold front pushed into the ar...