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Lake Hillcrest, IL Weather Forecast
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Lake Hillcrest Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  | | | | | |  |  | | | |
| Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Chance of Showers | Chance of T-Storm | Chance of Showers | Mostly Clear | Mostly Clear |
| Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 75°FLo: 24°C | Hi: 100°FHi: 38°C | Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C | Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C | Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C |
| POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 303 PM CDT Sun Aug 30 2026 
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Issued: 237 PM CDT Sun Aug 30 2026
Key Messages
- A prolonged regional heatwave expected Monday through at least Friday, with near-record warmth at times. Heat impacts will be compounded by the long duration of the event, and there is a heightened potential for more significant impacts within the St. Louis metro area and southwest Illinois.
Aviation
/18Z TAFS THROUGH 00Z TUESDAY/... Issued at 1217 PM CDT Sun Aug 30 2026
VFR conditions are expected to prevail at all sites through the 18Z TAF window. Breezy southwest winds this afternoon...