Iowa City, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Iowa City, a city in Johnson County, Iowa.
Overnight
51°F
Mostly Cloudy
Mostly cloudy. Low around 51, with temperatures rising to around 53 overnight. Southwest wind around 10 mph.
7-day forecast for Iowa City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Mostly Cloudy | 10 mph SW | 10% |
| Wednesday | 52°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph W | 30% |
| Wednesday Night | 46°F | Mostly Cloudy then Slight Chance Rain Showers | 10 mph W | 15% |
| Thursday | 54°F | Rain Showers Likely | 10 mph NW | 69% |
| Thursday Night | 42°F | Mostly Cloudy | 5 to 10 mph N | 10% |
| Friday | 50°F | Mostly Sunny | 5 to 10 mph N | 5% |
| Friday Night | 32°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 57°F | Sunny | 5 mph W | 2% |
| Sunday Night | 37°F | Clear | 0 to 5 mph SW | 0% |
| Monday | 63°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 63°F | Sunny | 5 mph NW | 0% |
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
5b
More local growing data for Iowa City: nearby ZIP 52242 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Coralville
Frytown
Hills
Kalona
Lone Tree
North Liberty
Oxford
Shueyville
Solon
Swisher
Tiffin
University Heights
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 Nov 4, 2026.