Iowa City Climate by Month
Iowa City, Iowa, United States
Hot summers and freezing winters, with rain spread through the year.
Hot summers and freezing winters, with rain spread through the year: that's Iowa City's climate in short. Expect highs of 87°F (30°C) in July and 31°F (0°C) in January, with the coldest nights (January) near 14°F (-10°C). About 36 in (926 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 87°F(30°C)
- Average high, July
- Coldest nights
- 14°F(-10°C)
- Average low, January
- Rain per year
- 36 in(926 mm)
- No clear rainy season
- Humidity
- 70%
- Sunniest: July
Best and worst months in Iowa City
Best for weatherThe most comfortable weather comes in May and September, with highs around 76°F (24°C) and about 4.2 in (108 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 31°F (0°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Iowa City weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 31°F(0°C) | 14°F(-10°C) | 1.2 in(30 mm) | 72% | 1.5 |
| FebFebruary | 36°F(2°C) | 18°F(-8°C) | 1.3 in(32 mm) | 80% | 2.6 |
| MarMarch | 50°F(10°C) | 29°F(-1°C) | 2.3 in(58 mm) | 73% | 3.8 |
| AprApril | 63°F(17°C) | 40°F(5°C) | 3.9 in(99 mm) | 61% | 4.5 |
| MayMayBest | 74°F(23°C) | 51°F(11°C) | 4.3 in(109 mm) | 62% | 5.3 |
| JunJune | 83°F(28°C) | 61°F(16°C) | 5.3 in(134 mm) | 67% | 5.9 |
| JulJuly | 87°F(30°C) | 65°F(19°C) | 4.1 in(105 mm) | 69% | 6.0 |
| AugAugust | 85°F(29°C) | 63°F(17°C) | 3.5 in(88 mm) | 70% | 5.3 |
| SepSeptemberBest | 78°F(26°C) | 54°F(12°C) | 4.2 in(106 mm) | 68% | 4.5 |
| OctOctober | 65°F(18°C) | 42°F(6°C) | 2.8 in(72 mm) | 64% | 2.9 |
| NovNovember | 49°F(9°C) | 31°F(-1°C) | 2.0 in(50 mm) | 72% | 1.8 |
| DecDecember | 36°F(2°C) | 20°F(-7°C) | 1.7 in(43 mm) | 78% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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