Marshalltown, IA Weather & Growing Conditions
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 10 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 67°F | Chance Showers And Thunderstorms | 7 to 10 mph SE | 61% |
| Saturday | 80°F | Showers And Thunderstorms Likely | 8 mph SW | 58% |
| Saturday Night | 60°F | Chance Showers And Thunderstorms | 9 mph N | 36% |
| Sunday | 67°F | Rain Showers Likely | 9 to 13 mph NE | 57% |
| Sunday Night | 54°F | Chance Showers And Thunderstorms | 12 mph ENE | 42% |
| Monday | 62°F | Rain Showers Likely | 12 mph ENE | 59% |
| Monday Night | 50°F | Rain Showers Likely | 7 to 12 mph NE | 59% |
| Tuesday | 61°F | Chance Rain Showers then Partly Sunny | 8 mph NE | 25% |
| Tuesday Night | 46°F | Partly Cloudy | 2 to 6 mph NE | 4% |
| Wednesday | 65°F | Mostly Sunny | 3 mph ENE | 1% |
| Wednesday Night | 50°F | Partly Cloudy | 2 mph E | 3% |
| Thursday | 67°F | Partly Sunny | 2 mph ESE | 12% |
| Thursday Night | 53°F | Partly Cloudy | 2 mph ESE | 9% |
| Friday | 68°F | Mostly Sunny | 3 mph E | 7% |
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 Sep 19, 2026.