Climate averages 1991–2020
Iowa City weather
in June.
A warm, wet month: the 3rd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
June is a warm month in Iowa City: daytime highs average 26.3°C and nights cool to about 17.0°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 128 mm of rain on roughly 12 days, which makes June a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 15 h 09 min on an average June day.
The nearest other city in this atlas is Cedar Rapids (40 km away). In June its highs average 25.8°C, about as warm as Iowa City, with 130 mm of rain.
Among the 498 cities listed in the United States, Iowa City ranks joint 306th of 498 for the warmest June highs and joint 451st of 498 for the driest June (rainfall, lowest first). The mean June high of those 498 cities is 27.9°C; Iowa City is 1.6°C cooler than that mean.
From June to July, average highs rise by 1.9°C to 28.2°C, and monthly rainfall falls from 128 mm to 95 mm.
The annual picture
June in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Iowa City climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.5°C-10.3°C | -10.3°C | 39 | 7.1 | 9.510 h |
| February | 1.1°C-8.2°C | -8.2°C | 46 | 6.5 | 10.611 h |
| March | 8.7°C-1.7°C | -1.7°C | 69 | 9.1 | 11.912 h |
| April | 15.5°C4.9°C | 4.9°C | 111 | 11.8 | 13.313 h |
| May | 21.4°C11.4°C | 11.4°C | 123 | 13.4 | 14.515 h |
| June, selected | 26.3°C17.0°C | 17.0°C | 128 | 11.7 | 15.115 h |
| July | 28.2°C19.3°C | 19.3°C | 95 | 9.5 | 14.915 h |
| August | 27.4°C18.4°C | 18.4°C | 96 | 9.1 | 13.914 h |
| September | 23.7°C14.2°C | 14.2°C | 99 | 8.1 | 12.513 h |
| October | 16.6°C7.6°C | 7.6°C | 74 | 8.6 | 11.111 h |
| November | 8.7°C0.3°C | 0.3°C | 59 | 7.6 | 9.910 h |
| December | 1.4°C-6.3°C | -6.3°C | 49 | 6.9 | 9.29 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
June in nearby cities
- Cedar Rapids in JuneUnited States · 40 kmHigh 25.8°C · Low 16.5°C · 130 mm rain
- Davenport in JuneUnited States · 81 kmHigh 26.6°C · Low 17.5°C · 118 mm rain
- Des Moines in JuneUnited States · 173 kmHigh 26.5°C · Low 17.2°C · 126 mm rain
- Peoria (Illinois), United States in JuneUnited States · 195 kmHigh 26.9°C · Low 17.8°C · 111 mm rain
- Rockford in JuneUnited States · 213 kmHigh 25.6°C · Low 15.9°C · 102 mm rain
- Madison in JuneUnited States · 235 kmHigh 25.1°C · Low 15.4°C · 112 mm rain
- Bloomington (Illinois), United States in JuneUnited States · 250 kmHigh 26.5°C · Low 17.2°C · 110 mm rain
- Springfield (Illinois), United States in JuneUnited States · 261 kmHigh 27.4°C · Low 18.0°C · 110 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Iowa City) is explained once on the Iowa City year overview and on the Sources, method and limits page.