Iowa City (IA) monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Iowa City

Iowa City average temperature chart (Celsius) Iowa City average temperature chart (Fahrenheit)
Average monthly temperatures in Iowa City (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -2.2 1 8 16.4 22.8 27.8 30 28.5 24.3 18.1 8.9 0.4
°F 28 33.7 46.5 61.5 73 82 86 83.2 75.7 64.5 48 32.8

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Iowa City monthly rainfall chart (mm) Iowa City monthly rainfall chart (inches)
Average monthly rainfall in Iowa City (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 28 24 58 85 95 109 102 102 95 62 51 42
inches 1.1 0.9 2.3 3.4 3.8 4.3 4 4 3.7 2.4 2 1.6
Rainy days 8 8 10 11 12 10 10 9 9 8 9 9

Average annual rainfall in Iowa City: 802.7mm (316 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Iowa City

Iowa City average daily sunshine chart
Average daily sunshine Iowa City
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.6 6.8 7.1 8.1 9.7 10.8 11 10 8.3 7.3 5 4.6

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Iowa City average minimum / maximum temperatures (Celsius) Iowa City average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Iowa City (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -11.8 -9 -2.3 4.3 10.5 15.7 18.3 16.7 12.2 5.9 -1 -8.5
Max °C -2 1.2 8.3 16.7 23.1 28.1 30.3 28.8 24.6 18.4 9.2 0.7
Min °F 10.8 15.8 27.9 39.7 50.9 60.3 64.9 62 54 42.5 30.3 16.8
Max °F 19.6 25 37.4 50.9 62.2 71.4 75.7 72.9 65.1 53.8 39.4 25

Sea temperature

The graph below shows the average sea temperature.

Iowa City average sea temperature chart (Celsius) Iowa City average sea temperature chart (Fahrenheit)
Average sea temperature around Iowa City in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.4 8.1 8.5 9.7 11.5 13.8 16.9 20.1 18.9 14.9 11.8 9.7
°F 47.2 46.6 47.3 49.4 52.7 56.9 62.4 68.2 66 58.9 53.2 49.4

Wind speed

The graph below shows the average wind speed.

Iowa City average winspeed by month (km/h) Iowa City average winspeed by month (mph)
Average wind speed in Iowa City (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 19 21 21 18 16 14 14 15 17 18 19
mph 12 12 13 13 11 10 9 9 9 11 11 12

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Iowa City relative humidity averages
Average relative humidity in Iowa City
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
72% 72% 70% 65% 66% 67% 71% 73% 73% 69% 73% 76%

Other monthly averages

UV index Best time to go?

Iowa City weather stats

Iowa City weather statistics
Hottest month: July 30°C 86°F
Driest month: February 24mm 0.9ins
Sunniest month: July 11hrs
Coldest month: January -2.2°C 28°F
Wettest month: June 109mm 4.3ins
Warmest sea: August 20.1°C 68.2°F
Map showing location of Iowa City (41.66113, -91.53017) Iowa City map pin © Google

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