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Johnson County, IA Weather Forecast
Johnson County, IA Weather Forecast Date: 236 AM CDT Fri Sep 18 2026
The area/counties/county of: Johnson, including the city of Iowa City.or toggle through each period.
Today... Mostly cloudy. A chance of showers with a slight chance of thunderstorms this morning. A slight chance of showers this afternoon. Humid with highs in the mid 70s. East winds 5 to 10 mph with gusts up to 20 mph, becoming southeast with gusts up to 20 mph this afternoon. Chance of rain 50%.
Tonight... Mostly cloudy. A slight chance of showers and thunderstorms in the evening, then showers with a chance of thunderstorms after midnight. Humid with lows in the upper 60s. Southeast winds 5 to 10 mph. Chance of rain 90%.
Saturday... Mostly cloudy with a chance of thunderstorms. Showers likely, mainly in the morning. Humid with highs in the lower 80s. South winds 5 to 10 mph, becoming west in the afternoon. Chance of rain 70%.
Saturday Night... A chance of thunderstorms. Showers with lows in the mid 60s. Northeast winds 5 to 10 mph. Chance of rain 90%.
Sunday... Showers in the morning, then showers likely with 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 with gusts up to 25 mph. Chance of rain 90%.
Sunday Night... A chance of showers 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 70%.
Monday Night... Mostly cloudy with a 50% chance of showers. Lows in the lower 50s.
Tuesday... Mostly cloudy. Highs in the lower 60s.
Tuesday Night... Partly cloudy. Lows around 50. Highs in the upper 60s.
Wednesday... Partly cloudy. Lows around 50. Highs in the upper 60s.
POP = Probability of Precipitation
Johnson County Radar Loop
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