Iowa City, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Iowa City, a city in Johnson County, Iowa.
Today
86°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Mostly sunny. High near 86, with temperatures falling to around 83 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
7-day forecast for Iowa City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 35% |
| Tonight | 66°F | Showers And Thunderstorms Likely | 5 mph N | 85% |
| Wednesday | 78°F | Showers And Thunderstorms | 5 mph NE | 81% |
| Wednesday Night | 60°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 53% |
| Thursday | 81°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 29% |
| Thursday Night | 61°F | Mostly Clear | 0 to 5 mph E | 3% |
| Friday | 84°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 66°F | Mostly Clear | 5 mph S | 11% |
| Saturday | 87°F | Mostly Sunny | 5 mph S | 10% |
| Saturday Night | 71°F | Mostly Clear | 5 to 10 mph S | 13% |
| Sunday | 89°F | Mostly Sunny | 10 mph S | 13% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 36% |
| Monday | 88°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 36% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 mph SE | 32% |
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 Aug 4, 2026.