Marshalltown, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marshalltown, a city in Marshall County, Iowa.
Tonight
67°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 2am, then showers and thunderstorms likely. Mostly cloudy, with a low around 67. Southeast wind 7 to 12 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Marshalltown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 67°F | Chance Showers And Thunderstorms | 7 to 12 mph SE | 61% |
| Saturday | 80°F | Showers And Thunderstorms Likely | 8 mph SW | 58% |
| Saturday Night | 61°F | Chance Showers And Thunderstorms | 9 mph N | 36% |
| Sunday | 67°F | Rain Showers Likely | 9 to 13 mph NE | 57% |
| Sunday Night | 55°F | Chance Showers And Thunderstorms | 12 mph ENE | 43% |
| Monday | 62°F | Rain Showers Likely | 12 mph ENE | 60% |
| Monday Night | 50°F | Rain Showers Likely | 7 to 10 mph NE | 60% |
| Tuesday | 61°F | Slight Chance Rain Showers then Partly Sunny | 8 mph NE | 24% |
| Tuesday Night | 46°F | Partly Cloudy | 2 to 6 mph NE | 4% |
| Wednesday | 65°F | Mostly Sunny | 5 mph ENE | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 2 mph E | 3% |
| Thursday | 67°F | Partly Sunny | 2 mph SE | 12% |
| Thursday Night | 53°F | Partly Cloudy | 2 mph ESE | 9% |
| Friday | 68°F | Mostly Sunny | 3 mph E | 8% |
Forecast source: National Weather Service (api.weather.gov) for Marshalltown (42.034, -92.906). Updated through the day.
Growing snapshot for Marshalltown
Last spring frost
Apr 28
First fall frost
Oct 7
Growing season
162 days
Hardiness zone
5a
More local growing data for Marshalltown: nearby ZIP 50158 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Albion
Clemons
Ferguson
Gilman
Green Mountain
Haverhill
Laurel
Le Grand
Liscomb
Melbourne
Rhodes
St. Anthony
State Center
Climate data from the nearest NOAA station, Marshalltown, Ia (1.6 mi from Marshalltown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.