Iowa City, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Iowa City, a city in Johnson County, Iowa.

This Afternoon

82°F

Chance Showers And Thunderstorms

A chance of showers and thunderstorms before 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 82. South wind around 10 mph. Chance of precipitation is 50%.

7-day forecast for Iowa City

When	Temp	Forecast	Wind	Precip
This Afternoon	82°F	Chance Showers And Thunderstorms	10 mph S	47%
Tonight	64°F	Chance Showers And Thunderstorms then Showers And Thunderstorms	5 to 10 mph NW	83%
Sunday	69°F	Showers And Thunderstorms Likely	10 to 15 mph NE	66%
Sunday Night	58°F	Chance Rain Showers	10 to 15 mph NE	53%
Monday	64°F	Rain Showers Likely	15 mph NE	56%
Monday Night	52°F	Chance Rain Showers	10 mph NE	43%
Tuesday	62°F	Chance Rain Showers	10 mph NE	26%
Tuesday Night	48°F	Mostly Clear	5 to 10 mph NE	6%
Wednesday	67°F	Sunny	5 mph NE	1%
Wednesday Night	52°F	Partly Cloudy	0 to 5 mph NE	1%
Thursday	68°F	Mostly Sunny	5 mph NE	7%
Thursday Night	55°F	Partly Cloudy	0 to 5 mph NE	5%
Friday	71°F	Mostly Sunny	5 mph E	5%
Friday Night	55°F	Partly Cloudy	0 to 5 mph E	7%

Forecast source: National Weather Service (api.weather.gov) for Iowa City (41.656, -91.531). Updated through the day.

Growing snapshot for Iowa City

Last spring frost

Apr 21

First fall frost

Oct 18

Growing season

180 days

Hardiness zone

More local growing data for Iowa City: nearby ZIP 52242 weather · frost dates · planting calendar · Iowa frost dates

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Climate data from the nearest NOAA station, Iowa City Muni Ap, Ia (2.1 mi from Iowa City). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.