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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.