Williams, IL Weather Forecast
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Williams Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
| Chance of Showers | Chance of T-Storm | Mostly Clear | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Showers | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C |
| POP: 30% | POP: 40% | POP: 50% | POP: 90% | POP: 70% | POP: 50% | POP: 60% | POP: 40% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 811 PM CDT Sun Sep 13 2026 

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Issued: 611 PM CDT Sun Sep 13 2026
Key Messages
- Active pattern this week to bring numerous rounds of showers and storms with heavy rain possible.
- There is a Marginal Risk, Level 1 out of 5, for severe storms across the western outlook area Monday evening into the overnight hours. Primary hazards will be heavy rain and damaging winds.
- An elevated flash flood risk may develop mid-week with repeating rounds of storms. Rainfall totals over 2 inches are likely for parts of the area, with localized areas of 4+ inches possible, leading t...
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