Harman US

Hamilton, IL Weather & Growing Conditions

This Afternoon
89°F
Mostly Cloudy
Mostly cloudy, with a high near 89. South wind around 10 mph.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 89°F Mostly Cloudy 10 mph S 9%
Tonight 68°F Chance Showers And Thunderstorms 0 to 5 mph SW 61%
Sunday 76°F Showers And Thunderstorms 5 to 15 mph N 81%
Sunday Night 61°F Chance Showers And Thunderstorms 10 to 15 mph NE 69%
Monday 66°F Showers And Thunderstorms Likely 15 mph NE 69%
Monday Night 55°F Chance Rain Showers 10 to 15 mph NE 35%
Tuesday 64°F Chance Rain Showers 10 mph NE 35%
Tuesday Night 50°F Partly Cloudy 5 to 10 mph NE 4%
Wednesday 68°F Mostly Sunny 5 to 10 mph NE 1%
Wednesday Night 54°F Partly Cloudy 5 mph NE 2%
Thursday 71°F Partly Sunny 5 mph NE 5%
Thursday Night 57°F Mostly Cloudy 5 mph NE 4%
Friday 73°F Mostly Sunny 5 to 10 mph NE 6%
Friday Night 57°F Partly Cloudy 5 mph NE 6%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Hamilton, IL

Last spring frost
Apr 10
First fall frost
Oct 27
Growing season
198 days
Hardiness zone
6a

Explore more for Hamilton, IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Keokuk Lock Dam 19, Ia (4.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.