Marshalltown, IA Weather & Growing Conditions
Tonight
46°F
Chance Rain Showers
A chance of rain showers before 5am. Cloudy. Low around 46, with temperatures rising to around 49 overnight. Southwest wind 6 to 9 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Chance Rain Showers | 6 to 9 mph SW | 41% |
| Wednesday | 53°F | Chance Rain Showers | 9 to 15 mph W | 38% |
| Wednesday Night | 42°F | Mostly Cloudy then Chance Rain Showers | 8 to 12 mph WSW | 30% |
| Thursday | 52°F | Rain Showers Likely | 10 mph NW | 63% |
| Thursday Night | 38°F | Slight Chance Rain Showers then Mostly Cloudy | 7 mph N | 17% |
| Friday | 51°F | Partly Sunny | 3 to 7 mph N | 3% |
| Friday Night | 31°F | Partly Cloudy | 2 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 0 to 3 mph W | 1% |
| Saturday Night | 35°F | Mostly Clear | 3 mph W | 4% |
| Sunday | 60°F | Sunny | 6 mph W | 6% |
| Sunday Night | 36°F | Mostly Clear | 5 mph SW | 2% |
| Monday | 64°F | Sunny | 5 to 9 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 63°F | Mostly Sunny | 5 mph NW | 1% |
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 Nov 4, 2026.