Marshalltown, IA Weather & Growing Conditions
Today
82°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Partly sunny. High near 82, with temperatures falling to around 78 in the afternoon. West northwest wind 5 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Showers And Thunderstorms Likely | 5 to 8 mph WNW | 73% |
| Tonight | 60°F | Showers And Thunderstorms | 5 to 9 mph NNE | 80% |
| Wednesday | 74°F | Showers And Thunderstorms Likely | 6 mph NNE | 57% |
| Wednesday Night | 54°F | Chance Rain Showers | 3 mph NNE | 27% |
| 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 | 64°F | Mostly Clear | 6 mph S | 13% |
| Saturday | 87°F | Sunny | 2 to 7 mph S | 11% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 9 mph SSW | 16% |
| Sunday | 88°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 | 87°F | Chance Showers And Thunderstorms | 7 to 10 mph S | 34% |
| Monday Night | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 7 to 10 mph E | 30% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Marshalltown, IA
Last spring frost
Apr 28
First fall frost
Oct 7
Growing season
162 days
Hardiness zone
5a
Explore more for Marshalltown, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Marshalltown, Ia (1.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.