Hamilton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a city in Hancock County, Illinois.
Tonight
51°F
Chance Rain Showers
A chance of rain showers before 4am. Mostly cloudy. Low around 51, with temperatures rising to around 53 overnight. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Chance Rain Showers | 10 to 15 mph SW | 36% |
| Wednesday | 56°F | Mostly Cloudy | 15 mph SW | 13% |
| Wednesday Night | 45°F | Mostly Cloudy | 5 to 10 mph SW | 2% |
| Thursday | 57°F | Partly Sunny | 10 mph W | 13% |
| Thursday Night | 44°F | Mostly Cloudy then Chance Rain Showers | 5 mph NW | 29% |
| Friday | 54°F | Mostly Cloudy | 5 to 10 mph N | 7% |
| Friday Night | 38°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 55°F | Partly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 38°F | Mostly Clear | 0 mph | 2% |
| Sunday | 61°F | Sunny | 0 to 5 mph W | 9% |
| Sunday Night | 39°F | Mostly Clear | 0 to 5 mph W | 3% |
| Monday | 65°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 43°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 66°F | Sunny | 5 mph NW | 0% |
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
Augusta
Basco
Bentley
Bowen
Carthage
Dallas City
Elvaston
Ferris
La Harpe
Nauvoo
Niota
Plymouth
Pontoosuc
West Point
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 Nov 4, 2026.