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Harper, IA 7-Day Night Weather Forecast
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Harper, IA Weather Forecast
Harper, IA Weather Forecast Date: 611 PM CDT Fri Sep 18 2026
The area/counties/county of: Keokuk, including the city of Sigourney.or toggle through each period.
Tonight... Partly cloudy this evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows in the upper 60s. Southeast winds 5 to 10 mph. Chance of rain 50%.
Saturday... Mostly cloudy with a slight chance of thunderstorms. Showers likely, mainly in the morning. Humid with highs in the lower 80s. South winds 5 to 10 mph, becoming southwest in the afternoon. Chance of rain 70%.
Saturday Night... A chance of thunderstorms. Showers with lows in the mid 60s. North winds 5 to 10 mph. Chance of rain 80%.
Sunday... Showers likely. A chance of thunderstorms in the afternoon. Not as warm and humid. Near steady temperature in the mid 60s. Northeast winds 10 to 15 mph. Chance of rain 70%.
Sunday Night... A chance of showers in the evening, then showers likely after midnight. Lows in the upper 50s. Northeast winds 10 to 15 mph. Chance of rain 70%.
Monday... A chance of showers in the morning, then showers likely in the afternoon. Near steady temperature in the upper 50s. Chance of rain 60%.
Monday Night... Mostly cloudy with a 40% chance of showers. Lows in the lower 50s.
Tuesday... Mostly cloudy in the morning, then becoming partly sunny. Highs in the lower 60s.
Tuesday Night... Partly cloudy. Lows around 50. Highs in the mid 60s.
Wednesday... Partly cloudy. Lows around 50. Highs in the mid 60s.
Thursday... Partly sunny. Highs in the upper 60s.
Thursday Night... Partly cloudy. Lows in the mid 50s. Highs in the upper 60s.
POP = Probability of Precipitation
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