Hamilton, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a city in Marion County, Iowa.
Tonight
49°F
Cloudy
Cloudy, with a low around 49. West southwest wind 9 to 13 mph, with gusts as high as 22 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Cloudy | 9 to 13 mph WSW | 14% |
| Wednesday | 54°F | Mostly Cloudy | 12 to 15 mph W | 13% |
| Wednesday Night | 45°F | Mostly Cloudy | 12 mph WSW | 5% |
| Thursday | 53°F | Chance Rain Showers | 8 to 12 mph WNW | 38% |
| Thursday Night | 42°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph NNW | 23% |
| Friday | 52°F | Partly Sunny | 3 to 8 mph N | 6% |
| Friday Night | 35°F | Partly Cloudy | 2 mph NNW | 1% |
| Saturday | 56°F | Partly Sunny | 3 mph WSW | 2% |
| Saturday Night | 38°F | Mostly Clear | 1 to 5 mph W | 3% |
| Sunday | 62°F | Sunny | 5 mph W | 6% |
| Sunday Night | 40°F | Mostly Clear | 6 mph WSW | 2% |
| Monday | 66°F | Sunny | 6 to 9 mph SW | 0% |
| Monday Night | 43°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 65°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Hamilton (41.170, -92.904). Updated through the day.
Growing snapshot for Hamilton
Last spring frost
Apr 24
First fall frost
Oct 16
Growing season
173 days
Hardiness zone
5b
More local growing data for Hamilton: nearby ZIP 50044 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Albia 3 Nne, Ia (11.4 mi from Hamilton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.