Hamilton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a city in Hancock County, Illinois.
This Afternoon
89°F
Mostly Cloudy
Mostly cloudy, with a high near 89. South wind around 10 mph.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 89°F | Mostly Cloudy | 10 mph S | 9% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 62% |
| Sunday | 76°F | Showers And Thunderstorms | 5 to 10 mph N | 80% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 10 mph NE | 69% |
| Monday | 66°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 69% |
| Monday Night | 55°F | Chance Rain Showers | 10 mph NE | 36% |
| Tuesday | 64°F | Chance Rain Showers | 10 mph NE | 36% |
| Tuesday Night | 50°F | Partly Cloudy | 5 to 10 mph NE | 4% |
| Wednesday | 68°F | Mostly Sunny | 5 mph NE | 1% |
| Wednesday Night | 54°F | Partly Cloudy | 0 to 5 mph NE | 2% |
| Thursday | 71°F | Partly Sunny | 5 mph NE | 5% |
| Thursday Night | 57°F | Mostly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 73°F | Mostly Sunny | 5 mph E | 6% |
| Friday Night | 57°F | Partly Cloudy | 5 mph E | 6% |
Forecast source: National Weather Service (api.weather.gov) for Hamilton (40.391, -91.361). Updated through the day.
Growing snapshot for Hamilton
Last spring frost
Apr 10
First fall frost
Oct 27
Growing season
198 days
Hardiness zone
6a
More local growing data for Hamilton: nearby ZIP 62341 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Keokuk Lock Dam 19, Ia (4.6 mi from Hamilton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.