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Decatur, IA 7-Day Night Weather Forecast
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Decatur, IA Weather Forecast
Decatur, IA Weather Forecast Date: 258 PM CDT Fri Sep 18 2026
The area/counties/county of: Decatur, including the cities of: Lamoni and Leon.or toggle through each period.
Tonight... Sunny, then becoming partly cloudy this evening, then becoming mostly cloudy. A chance of showers and thunderstorms after midnight. Humid with lows around 70. South winds 5 to 10 mph. Chance of rain 40%.
Saturday... Mostly cloudy in the morning, then becoming partly sunny. A chance of showers. A chance of thunderstorms, mainly in the morning. Humid with highs in the lower 80s. Southwest winds 5 to 10 mph. Chance of rain 40%.
Saturday Night... Showers likely with a chance of thunderstorms. Humid with lows in the mid 60s. North winds around 5 mph. Chance of rain 70%.
Sunday... Cloudy with a chance of thunderstorms. A chance of showers in the morning, then showers likely in the afternoon. Humid. Near steady temperature in the upper 60s. North winds 5 to 10 mph. Chance of rain 60%.
Sunday Night... A chance of showers in the evening, then showers likely after midnight. Lows in the upper 50s. Northeast winds around 10 mph. Chance of rain 60%.
Monday... Showers likely, mainly in the morning. Near steady temperature around 60. Chance of rain 60%.
Monday Night... Mostly cloudy. A chance of showers in the evening. Lows in the lower 50s. Chance of rain 50%.
Tuesday... Mostly cloudy in the morning, then becoming partly sunny. Highs around 60.
Tuesday Night... Mostly cloudy in the evening, then becoming partly cloudy. Lows in the upper 40s.
Wednesday... Mostly sunny. Highs in the lower 60s.
Wednesday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 50s.
Thursday... Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 60s.
Thursday Night... Mostly cloudy. A slight chance of showers after midnight. Lows in the mid 50s. Chance of rain 20%.
POP = Probability of Precipitation
Decatur Radar Loop
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