Marshalltown, Iowa Weather
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Climate of Marshalltown: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Marshalltown, with average daytime highs around 29°C. January is the coolest, when nights typically fall to about -11°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 40°C, so the seasons feel very different from each other.
The area receives about 900 mm of rain in a typical year. Most of it falls from May to June and August, and June is the wettest month at roughly 135 mm.
For outdoor plans and travel, July and September usually offer the most comfortable weather in Marshalltown, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | -2° | -11° | 24 mm | 85% |
| Feb | 0° | -10° | 29 mm | 82% |
| Mar | 8° | -3° | 48 mm | 77% |
| Apr | 16° | 3° | 94 mm | 72% |
| May | 22° | 10° | 118 mm | 74% |
| Jun | 27° | 16° | 135 mm | 75% |
| Jul | 29° | 18° | 96 mm | 74% |
| Aug | 28° | 17° | 109 mm | 72% |
| Sep | 24° | 12° | 91 mm | 71% |
| Oct | 16° | 4° | 72 mm | 73% |
| Nov | 8° | -2° | 44 mm | 78% |
| Dec | 0° | -8° | 41 mm | 85% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Marshalltown. Values describe typical conditions, not a forecast.
About Marshalltown weather
Marshalltown lies in Iowa's humid continental climate, typical of the US corn belt — about 79 km north-east of Des Moines. Expect warm, humid summers (June–August). Winter brings cold winters (December–February) with regular snow. This page shows live, auto-refreshing weather for Marshalltown: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Marshalltown is about 79 km north-east of Des Moines, in Iowa.
Marshalltown sees cold winters (December–February) with regular snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Marshalltown's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Marshalltown, with average daytime highs of about 29°C and nights around 18°C.
The coldest nights come in January, when the average low is about -11°C and daytime highs reach around -2°C. Frost is possible on clear, calm nights.
Marshalltown receives about 900 mm of rain in a typical year. June is the wettest month at roughly 135 mm, and the main rainy period is May to June and August.
July and September usually offer the most comfortable weather in Marshalltown, with mild daytime temperatures and little rain.
In November Marshalltown typically sees daytime highs near 8°C and lows near -2°C, with about 44 mm of rain over the month and average humidity around 78%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Marshalltown updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Marshalltown's day-to-day weather follows the broader pattern of Iowa described above. See the hourly weather forecast or the air quality index for more detail.