Hamilton, IL Weather & Growing Conditions
Overnight
52°F
Mostly Cloudy
Mostly cloudy, with a low around 52. Southwest wind around 10 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Mostly Cloudy | 10 mph SW | 7% |
| Wednesday | 57°F | Mostly Cloudy | 10 to 15 mph W | 10% |
| Wednesday Night | 46°F | Mostly Cloudy | 10 mph SW | 3% |
| Thursday | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph W | 16% |
| Thursday Night | 45°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 23% |
| Friday | 52°F | Partly Sunny | 5 to 10 mph N | 5% |
| Friday Night | 34°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 36°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 59°F | Sunny | 5 mph W | 2% |
| Sunday Night | 38°F | Clear | 0 to 5 mph W | 0% |
| Monday | 65°F | Sunny | 0 to 10 mph SW | 0% |
| 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). 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 Nov 4, 2026.