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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

WhenTempForecastWindPrecip
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.