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Williamsburg, IA Weather Forecast
Williamsburg, IA Weather Forecast Date: 836 AM CDT Thu Sep 17 2026
The area/counties/county of: Iowa, including the city of Marengo.or toggle through each period.
Rest of Today... Mostly cloudy. A chance of showers with a slight chance of thunderstorms early this morning. Areas of fog early this morning. Some thunderstorms May produce heavy rainfall early this morning. Highs in the upper 70s. Northeast winds around 5 mph. Chance of rain 30%.
Tonight... Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 60s. Northeast winds 5 to 10 mph. Chance of rain 20%.
Friday... Mostly cloudy with a chance of thunderstorms. Showers likely, mainly in the morning. Humid with highs in the upper 70s. Southeast winds 5 to 10 mph. Chance of rain 70%.
Friday Night... Mostly cloudy. Showers likely with a chance of thunderstorms after midnight. Humid with lows in the upper 60s. Southeast winds around 10 mph. Chance of rain 70%.
Saturday... Becoming partly sunny in the afternoon. Showers likely in the morning. Humid with highs in the lower 80s. South winds 5 to 10 mph, becoming southwest with gusts up to 20 mph in the afternoon. Chance of rain 70%.
Saturday Night... A chance of thunderstorms. Showers likely, mainly in the evening. Lows in the lower 60s. Chance of rain 60%.
Sunday... Mostly cloudy. A chance of showers in the morning, then showers likely in the afternoon. Not as warm with highs in the upper 60s. Chance of rain 60%.
Sunday Night... A chance of showers and thunderstorms in the evening, then showers likely after midnight. Lows in the mid 50s. Chance of rain 60%.
Monday... Showers likely, mainly in the morning. Highs in the lower 60s. Chance of rain 60%.
Monday Night... Mostly cloudy. A chance of showers in the evening. Lows in the lower 50s. Chance of rain 40%.
Tuesday... Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 60s.
Tuesday Night... Partly cloudy. Lows in the lower 50s. Highs in the upper 60s.
POP = Probability of Precipitation
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