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Elwin, IL Weather Forecast
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Elwin Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  | | | | | | | | | | |
| Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C | Hi: 89°FHi: 32°C Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C Lo: 70°FLo: 21°C | Hi: 90°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 437 AM CDT Thu Sep 03 2026 
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Issued: 404 AM CDT Thu Sep 3 2026
Key Messages
- Extreme Heat: An Extreme Heat Warning is in effect through 7 pm Friday across central and southeast IL, and extended through 7 pm Saturday from Schuyler, Menard, Sangamon, Shelby and Crawford counties southwest. High heat and humidity to push peak heat index values to around 105F or higher. Highs may reach 100F (30-70% chance per NBM) from Springfield to Robinson southwest today and Friday. Heat indices still peak from 100-105F on Saturday afternoon.
- Isolated Severe Storm Potential: ...