Annual mean 11°C · wettest around May · prevailing wind SW
Warmest
27.7 °C
Coldest
-4.3 °C
Wettest
44%
Windiest
6.6 m/s
Prevailing
SW
5.1 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Iowa City over the whole year is 11°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -7°C. Iowa City has no sharply defined rainy season: the chance of rain on a given day runs from 40% in February, the driest month, to 44% in May, the wettest. Winds in Iowa City are highest in April, averaging 4.9 m/s (18 km/h), and lightest in August, at 2.7 m/s (10 km/h). The prevailing wind is from the SW. The clearest skies in Iowa City come in June, when the sky is typically 25% covered; January is the cloudiest month, at 54%.
Month by month Iowa City climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-3°C
-7°C
-10°C
40%
54%
4.3 m/s
0
0
1
February
0°C
-6°C
-6°C
40%
43%
4.4 m/s
1
0
9
March
8°C
1°C
1°C
42%
48%
4.7 m/s
4
0
23
April
14°C
5°C
8°C
43%
43%
4.9 m/s
22
1
49
May
21°C
13°C
17°C
44%
41%
3.9 m/s
58
15
65
June
27°C
19°C
26°C
43%
25%
3.5 m/s
56
51
30
July
28°C
20°C
29°C
42%
27%
2.8 m/s
42
64
13
August
27°C
18°C
27°C
41%
27%
2.7 m/s
54
57
23
September
24°C
15°C
23°C
42%
28%
3.0 m/s
65
39
47
October
16°C
8°C
12°C
42%
38%
3.7 m/s
37
5
60
November
8°C
1°C
2°C
41%
40%
4.1 m/s
7
0
27
December
1°C
-3°C
-5°C
41%
48%
4.2 m/s
0
0
7
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Iowa City weather by season
Year round, Iowa City has days of about -3°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -7°C to 20°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around May and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Iowa City weather in winterDecember to February
High -1°CLow -5°CRain 40%
Winter in Iowa City has typical daily highs of about -1°C and lows of about -5°C, with a 40% chance of rain on a given day.
Iowa City weather in springMarch to May
High 14°CLow 6°CRain 43%
Spring in Iowa City has typical daily highs of about 14°C and lows of about 6°C, with a 43% chance of rain on a given day.
Iowa City weather in summerJune to August
High 27°CLow 19°CRain 42%
Summer in Iowa City has typical daily highs of about 27°C and lows of about 19°C, with a 42% chance of rain on a given day.
Iowa City weather in autumnSeptember to November
High 16°CLow 8°CRain 42%
Autumn in Iowa City has typical daily highs of about 16°C and lows of about 8°C, with a 42% chance of rain on a given day.
When is the rainy season in Iowa City?
Iowa City has no sharply defined rainy season: the chance of rain on a given day runs from 40% in February, the driest month, to 44% in May, the wettest.
What time of year is Iowa City windiest?
Winds in Iowa City are highest in April, averaging 4.9 m/s (18 km/h), and lightest in August, at 2.7 m/s (10 km/h). The prevailing wind is from the SW.
What is the average temperature in Iowa City year round?
The average temperature in Iowa City over the whole year is 11°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -7°C.