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Blair, IL Weather Forecast
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Blair Weather Forecast
| THIS AFTERNOON | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
 |  |  |  | | | |  |  | | | |
| Chance of T-Storm | Chance of T-Storm | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Partly Cloudy | Chance of Showers | Partly Cloudy | Chance of T-Storm | Chance of T-Storm |
| Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°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: 95°FHi: 35°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C |
| POP: 50% | POP: 30% | POP: 20% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 133 PM CDT Wed Sep 16 2026 
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Issued: 145 PM CDT Wed Sep 16 2026
Key Messages
- A late season heat wave continues through at least Saturday with peak heat index values of 100-105F+ along/south of I-70. Areas just north of I-70 have been added to the Heat Advisory, and the rest of the advisory has been extended to Saturday.
- Isolated to scattered thunderstorms are expected this afternoon. These storms are not expected to strong enough to produce severe weather, though small hail, gusty winds, and brief heavy downpours are possible.
Aviation
/18Z TAFS THROUGH 00Z FRI...