Marshalltown, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marshalltown, a city in Marshall County, Iowa.
Today
82°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 7am. Mostly cloudy. High near 82, with temperatures falling to around 78 in the afternoon. West wind 5 to 8 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Marshalltown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Chance Showers And Thunderstorms | 5 to 8 mph W | 32% |
| Tonight | 61°F | Showers And Thunderstorms | 3 to 9 mph N | 81% |
| Wednesday | 75°F | Showers And Thunderstorms Likely | 5 mph NNE | 59% |
| Wednesday Night | 55°F | Chance Rain Showers | 3 mph NNE | 28% |
| Thursday | 81°F | Sunny | 2 mph ENE | 2% |
| Thursday Night | 59°F | Mostly Clear | 2 mph SE | 0% |
| Friday | 84°F | Sunny | 1 to 7 mph SSE | 7% |
| Friday Night | 65°F | Mostly Clear | 6 mph SSE | 13% |
| Saturday | 88°F | Sunny | 3 to 8 mph S | 11% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 9 mph SSW | 16% |
| Sunday | 89°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 9 mph S | 16% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 8 mph SSE | 34% |
| Monday | 88°F | Chance Showers And Thunderstorms | 7 to 12 mph S | 34% |
| Monday Night | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 mph ESE | 30% |
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 Aug 4, 2026.