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Grinnell High School, IA 7-Day Night Weather Forecast
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Grinnell High School, IA Weather Forecast
Grinnell High School, IA Weather Forecast Date: 858 PM CDT Tue Aug 18 2026
The area/counties/county of: Poweshiek, including the city of Grinnell.or toggle through each period.
Rest of Tonight... Mostly cloudy. A slight chance of showers and thunderstorms early this evening. Patchy fog. Lows in the lower 60s. West winds around 5 mph, becoming northwest. Chance of rain 20%.
Wednesday... Patchy fog in the morning. Partly sunny. Humid with highs around 80. Northeast winds around 5 mph.
Wednesday Night... Partly cloudy in the evening, then clearing. Lows in the upper 50s. Northeast winds around 5 mph in the evening, becoming light and variable.
Thursday... Sunny. Highs in the lower 80s. Light and variable winds, becoming south around 5 mph in the afternoon.
Thursday Night... Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 60s. South winds around 5 mph. Chance of rain 20%.
Friday... Mostly sunny. A chance of showers and thunderstorms in the morning. Highs in the lower 80s. Chance of rain 30%.
Friday Night... Mostly clear with a slight chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 20%.
Saturday... Sunny. Highs in the lower 80s.
Saturday Night... Mostly clear. Lows in the upper 50s.
Sunday... Mostly sunny with a 20% chance of showers. Highs in the upper 70s.
Sunday Night... Mostly cloudy in the evening, then partly cloudy with a slight chance of showers after midnight. Lows around 60. Chance of rain 20%.
Monday... Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs around 80. Chance of rain 20%.
Monday Night... Partly cloudy in the evening, then clearing. Lows in the lower 60s.
POP = Probability of Precipitation
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