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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
Augusta
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Ferris
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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 Sep 19, 2026.