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Auxiliary Reservoir, IL Weather Forecast
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Auxiliary Reservoir Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  | |  | |  | | |  | |  |  |
| Mostly Sunny | Clear | Mostly Sunny | Chance of T-Storm | Mostly Sunny | Partly Cloudy | Mostly Clear | Mostly Clear | Partly Sunny | Partly Cloudy | Partly Cloudy | Chance of Showers |
| Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Hi: 81°FHi: 27°C Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C Lo: 69°FLo: 21°C | Lo: 61°FLo: 16°C |
| POP: 50% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 702 AM CDT Sat Aug 15 2026 
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Issued: 106 AM CDT Sat Aug 15 2026
Key Messages
- An Extreme Heat Warning continues thru the weekend with Heat Indices peaking in the triple digits up to near 115 degrees.
- Storm chances, including strong storm chances, are best with frontal passages Sunday night and Wednesday night. Both frontal passages bring cooler temperatures and lower humidity.
Discussion
... Issued at 100 AM CDT Fri Aug 14 2026
Strong high pressure keeps us baking thru the weekend. Highs yesterday were largely in the mid-upper 90s, w...