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Cairo, IL Weather Forecast
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Cairo Weather Forecast
| OVERNIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT |
 |  |  |  | | | | | | |  |  |
| Clear | Chance of T-Storm | Chance of Showers | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Chance of Showers | Clearing |
| Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C |
| POP: 20% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Sat Sep 05 2026 
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Issued: 231 AM CDT Sat Sep 5 2026
Key Messages
- An Extreme Heat Warning remains in effect through 8 PM this evening. Temperatures will once again push 100 today, while heat index values will range from 105 to 110. There is a 30-50% chance of triple digit heat index values continuing into Sunday mainly over western portions of southeast Missouri.
- Scattered showers and thunderstorms will be possible throughout the Quad State this afternoon and evening. Gusty winds, lightning and brief heavy downpours will be the primary concerns.
- La...