Hamilton, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a city in Marion County, Iowa.
Today
84°F
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 11am, then a slight chance of showers and thunderstorms. Partly sunny. High near 84, with temperatures falling to around 82 in the afternoon. Southwest wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 6 to 9 mph SW | 49% |
| Tonight | 65°F | Showers And Thunderstorms Likely | 1 to 7 mph NNW | 68% |
| Sunday | 68°F | Rain Showers Likely then Chance Showers And Thunderstorms | 7 to 10 mph NNE | 57% |
| Sunday Night | 58°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 mph NE | 63% |
| Monday | 61°F | Rain Showers Likely | 12 mph NE | 63% |
| Monday Night | 53°F | Rain Showers Likely | 9 mph NE | 59% |
| Tuesday | 60°F | Chance Rain Showers then Partly Sunny | 9 mph NE | 34% |
| Tuesday Night | 48°F | Partly Cloudy | 6 mph NE | 3% |
| Wednesday | 64°F | Sunny | 5 mph NE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 2 mph ENE | 3% |
| Thursday | 66°F | Partly Sunny | 3 mph E | 13% |
| Thursday Night | 56°F | Mostly Cloudy | 2 mph E | 7% |
| Friday | 68°F | Partly Sunny | 5 mph E | 7% |
| Friday Night | 57°F | Mostly Cloudy | 3 mph ESE | 7% |
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 Sep 19, 2026.