Marion, Iowa Climate by Month
Marion, Iowa, United States
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's Marion's climate in short. July is the warmest month, with highs around 85°F (30°C); January is the coolest at 30°F (-1°C), and nights dip to 13°F (-11°C). It gets 37 in (929 mm) of rain a year, spread across the months.
- Warmest month
- 85°F(30°C)
- Average high, July
- Coldest nights
- 13°F(-11°C)
- Average low, January
- Rain per year
- 37 in(929 mm)
- No clear rainy season
- Humidity
- 72%
- Sunniest: July
Best and worst months in Marion
Best for weatherThe most comfortable weather comes in May and September, with highs around 75°F (24°C) and about 4.4 in (111 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 30°F (-1°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 September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Marion weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 30°F(-1°C) | 13°F(-11°C) | 1.1 in(28 mm) | 77% | 1.5 |
| FebFebruary | 35°F(2°C) | 16°F(-9°C) | 1.2 in(31 mm) | 85% | 2.5 |
| MarMarch | 48°F(9°C) | 28°F(-2°C) | 2.1 in(54 mm) | 64% | 3.8 |
| AprApril | 62°F(17°C) | 39°F(4°C) | 3.9 in(99 mm) | 64% | 4.5 |
| MayMayBest | 73°F(23°C) | 50°F(10°C) | 4.4 in(112 mm) | 65% | 5.2 |
| JunJune | 82°F(28°C) | 60°F(15°C) | 5.6 in(141 mm) | 70% | 5.9 |
| JulJuly | 85°F(30°C) | 64°F(18°C) | 4.1 in(103 mm) | 72% | 6.0 |
| AugAugust | 84°F(29°C) | 62°F(16°C) | 3.5 in(90 mm) | 73% | 5.3 |
| SepSeptemberBest | 77°F(25°C) | 53°F(12°C) | 4.3 in(109 mm) | 67% | 4.5 |
| OctOctober | 64°F(18°C) | 41°F(5°C) | 2.8 in(70 mm) | 67% | 2.8 |
| NovNovember | 47°F(9°C) | 29°F(-2°C) | 2.0 in(50 mm) | 77% | 1.8 |
| DecDecember | 34°F(1°C) | 18°F(-8°C) | 1.7 in(42 mm) | 84% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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