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Williamsburg, IA Weather Forecast
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Williamsburg Weather Forecast
| THIS AFTERNOON | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | SATURDAY |
 | | |  |  |  |  | | | |  |
| Chance of Showers | Chance of Showers | Chance of Showers | Showers Likely | Mostly Cloudy | Clearing | Sunny | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers |
| Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C | Hi: 59°FHi: 15°C | Lo: 51°FLo: 11°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C |
| POP: 20% | POP: 20% | POP: 50% | POP: 70% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 126 PM CDT Sun Sep 20 2026 
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Issued: 940 PM CDT Sun Sep 20 2026
Key Messages
- An upper low will continue to spin near our local area through Tuesday morning, leading to occasional showers and continued cool and cloudy conditions.
- Expectations for several beautiful early Fall days are growing for mid week, with highs in the 60s and lows in the 40s/50s.
Aviation
/00Z TAFS THROUGH 00Z TUESDAY/... Issued at 715 PM CDT Sun Sep 20 2026
Widespread low stratus will continue over eastern Iowa and northwest Illinois, resulting in periods of MVFR/IFR ceilings. The most like...