Hamilton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a city in Hancock County, Illinois.
Today
91°F
Sunny
Sunny. High near 91, with temperatures falling to around 89 in the afternoon. South wind 5 to 10 mph.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 91°F | Sunny | 5 to 10 mph S | 1% |
| Tonight | 70°F | Slight Chance Showers And Thunderstorms | 5 mph SE | 21% |
| Wednesday | 84°F | Chance Showers And Thunderstorms | 5 mph S | 65% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 5 mph N | 84% |
| Thursday | 83°F | Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 mph NE | 79% |
| Thursday Night | 65°F | Partly Cloudy | 0 to 5 mph E | 10% |
| Friday | 86°F | Mostly Sunny | 0 to 5 mph S | 7% |
| Friday Night | 68°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph S | 21% |
| Saturday | 89°F | Slight Chance Showers And Thunderstorms then Sunny | 0 to 5 mph S | 21% |
| Saturday Night | 72°F | Mostly Clear | 5 to 10 mph S | 7% |
| Sunday | 91°F | Sunny | 10 mph SW | 7% |
| Sunday Night | 72°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 18% |
| Monday | 92°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 10 mph SW | 18% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 26% |
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
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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 Aug 4, 2026.