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Fullerton County Forest Preserve, IL Weather Forecast
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Fullerton County Forest Preserve Weather Forecast
| 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 | Clearing | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 81°FHi: 27°C | Lo: 71°FLo: 22°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 79°FHi: 26°C | Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C |
| POP: 90% | POP: 50% | POP: 50% | POP: 70% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 751 AM CDT Sat Aug 15 2026 
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Fullerton County Forest Preserve Forecast Discussion
Issued: 706 AM CDT Sat Aug 15 2026
Key Messages
- Showers are expected at times through this evening with the greatest coverage this morning.
- Another round of showers and thunderstorms likely late tonight into Sunday.
- A brief break in the stormy pattern is expected Monday into Tuesday before another storm system moves through towards midweek.
Discussion
... Issued at 123 AM CDT Sat Aug 15 2026
A shortwave trough is pivoting across eastern IA and northern MO and will eventually traverse across northern IL a...