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St. Mary's Park Cairo, IL Weather Forecast
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St. Mary's Park Cairo Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SUNDAY |
 |  | | | | | | | | | | |
| Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°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 |
POP = Probability of Precipitation.
Weather Outlook Updated: 1052 PM CDT Sun Aug 30 2026 
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Issued: 1142 PM CDT Sun Aug 30 2026
Key Messages
- Another heatwave is set to kick off on Monday with an 80-100% chance of heat indices of 100+ by Tuesday and lasting through Friday.
- A Heat Advisory is in effect for Monday for the start of the prolonged heatwave. An Excessive Heat Watch is in effect Tuesday through Friday.
- Limited relief from the heat is expected this weekend with only isolated chances for showers/storms. Highs will likely remain in the lower 90s.
Discussion
... Issued at 135 PM CDT Sun Aug 30 2026
A potent upper level ...