Harman US

Hamilton, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a city in Hancock County, Illinois.

Tonight
72°F
Partly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 72. Southeast wind 5 to 10 mph. Chance of precipitation is 20%.

7-day forecast for Hamilton

WhenTempForecastWindPrecip
Tonight 72°F Partly Cloudy then Slight Chance Showers And Thunderstorms 5 to 10 mph SE 16%
Saturday 90°F Partly Sunny 5 mph SW 9%
Saturday Night 68°F Chance Showers And Thunderstorms 5 mph NW 60%
Sunday 78°F Showers And Thunderstorms Likely 5 to 10 mph N 66%
Sunday Night 61°F Showers And Thunderstorms Likely 10 mph NE 67%
Monday 67°F Showers And Thunderstorms Likely 10 mph NE 67%
Monday Night 56°F Chance Rain Showers 10 mph NE 48%
Tuesday 64°F Chance Rain Showers 10 mph NE 27%
Tuesday Night 51°F Mostly Cloudy 5 to 10 mph NE 6%
Wednesday 68°F Mostly Sunny 5 mph NE 1%
Wednesday Night 54°F Partly Cloudy 0 to 5 mph NE 1%
Thursday 70°F Mostly Sunny 0 to 5 mph NE 4%
Thursday Night 57°F Partly Cloudy 0 to 5 mph NE 5%
Friday 72°F Mostly Sunny 0 to 5 mph NE 7%

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

Nearby towns & communities

All Illinois locations ›

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.