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St. Augustine High School, IL Weather Forecast
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St. Augustine High School Weather Forecast
| REST OF TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  | |  |  |  |  | |  | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Mostly Cloudy | Chance of Showers | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy |
| Hi: 75°FHi: 24°C | Lo: 65°FLo: 18°C | Hi: 70°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C | Hi: 61°FHi: 16°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C |
| POP: 100% | POP: 100% | POP: 60% | POP: 20% | POP: 30% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1036 AM CDT Sat Sep 19 2026 
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Issued: 635 AM CDT Sat Sep 19 2026
Key Messages
- A Flood Watch for flash flooding is in effect for much of northern Illinois and far northwest Indiana through early this afternoon.
- Periods of heavy rain and scattered thunderstorms through mid/late this morning and then a second wave of heavy rain and scattered thunderstorms tonight into Sunday. Localized flash flooding will be possible where the heaviest rains occur over the same areas.
- Below normal temps early/mid next week with low chances for showers.
Discussion
... Issued at 148 ...