Hamilton, IL Weather & Growing Conditions
Today
89°F
Sunny
Sunny, with a high near 89. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Sunny | 5 to 10 mph S | 1% |
| Tonight | 69°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SE | 22% |
| Wednesday | 84°F | Chance Showers And Thunderstorms | 5 mph S | 65% |
| Wednesday Night | 65°F | Showers And Thunderstorms | 5 mph N | 85% |
| Thursday | 82°F | Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 mph NE | 77% |
| Thursday Night | 64°F | Mostly Clear | 0 to 5 mph E | 10% |
| Friday | 85°F | Mostly Sunny | 0 to 5 mph S | 7% |
| Friday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SE | 22% |
| Saturday | 88°F | Slight Chance Showers And Thunderstorms then Sunny | 5 to 10 mph S | 22% |
| Saturday Night | 72°F | Mostly Clear | 5 to 10 mph S | 7% |
| Sunday | 90°F | Sunny | 10 to 15 mph SW | 7% |
| Sunday Night | 72°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 18% |
| Monday | 90°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 18% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 10 mph S | 26% |
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 Aug 4, 2026.