Hamilton, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a city in Marion County, Iowa.
Today
87°F
Partly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 3pm. Partly sunny. High near 87, with temperatures falling to around 85 in the afternoon. West southwest wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 6 mph WSW | 22% |
| Tonight | 65°F | Showers And Thunderstorms | 8 mph NNE | 89% |
| Wednesday | 75°F | Showers And Thunderstorms Likely | 7 mph NE | 93% |
| Wednesday Night | 60°F | Showers And Thunderstorms Likely | 3 to 7 mph NNE | 60% |
| Thursday | 81°F | Chance Rain Showers then Mostly Sunny | 3 mph NE | 32% |
| Thursday Night | 62°F | Mostly Clear | 2 mph ESE | 3% |
| Friday | 85°F | Sunny | 5 mph SSE | 7% |
| Friday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SSE | 15% |
| Saturday | 89°F | Sunny then Slight Chance Rain Showers | 3 to 7 mph SSW | 15% |
| Saturday Night | 73°F | Slight Chance Rain Showers then Mostly Clear | 7 to 12 mph SSW | 15% |
| Sunday | 90°F | Sunny | 13 mph SSW | 11% |
| Sunday Night | 72°F | Partly Cloudy then Chance Showers And Thunderstorms | 12 mph S | 25% |
| Monday | 91°F | Chance Showers And Thunderstorms then Mostly Sunny | 13 mph SSW | 25% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 13 mph S | 28% |
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 Aug 4, 2026.