Marshalltown Climate by Month
Marshalltown, 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 Marshalltown's climate in short. July is the warmest month, with highs around 84°F (29°C); January is the coolest at 29°F (-2°C), and nights dip to 11°F (-12°C). It gets 35 in (884 mm) of rain a year, spread across the months.
- Warmest month
- 84°F(29°C)
- Average high, July
- Coldest nights
- 11°F(-12°C)
- Average low, January
- Rain per year
- 35 in(884 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: July
Best and worst months in Marshalltown
Best for weatherThe most comfortable weather comes in September, with highs around 77°F (25°C) and about 3.7 in (93 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 29°F (-2°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)
Marshalltown weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 29°F(-2°C) | 11°F(-12°C) | 0.9 in(24 mm) | 82% | 1.6 |
| FebFebruary | 34°F(1°C) | 15°F(-10°C) | 1.2 in(30 mm) | 90% | 2.5 |
| MarMarch | 47°F(8°C) | 27°F(-3°C) | 2.0 in(52 mm) | 67% | 3.7 |
| AprApril | 61°F(16°C) | 38°F(3°C) | 3.6 in(92 mm) | 67% | 4.5 |
| MayMay | 72°F(22°C) | 49°F(10°C) | 4.5 in(114 mm) | 66% | 5.2 |
| JunJune | 81°F(27°C) | 59°F(15°C) | 5.4 in(137 mm) | 71% | 5.9 |
| JulJuly | 84°F(29°C) | 63°F(17°C) | 3.7 in(95 mm) | 78% | 6.1 |
| AugAugust | 82°F(28°C) | 60°F(16°C) | 3.9 in(100 mm) | 76% | 5.4 |
| SepSeptemberBest | 77°F(25°C) | 52°F(11°C) | 3.7 in(93 mm) | 68% | 4.5 |
| OctOctober | 63°F(17°C) | 40°F(4°C) | 2.8 in(71 mm) | 70% | 2.8 |
| NovNovember | 47°F(8°C) | 28°F(-2°C) | 1.6 in(40 mm) | 79% | 1.8 |
| DecDecember | 33°F(1°C) | 16°F(-9°C) | 1.4 in(36 mm) | 88% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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