Clinton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Clinton, a city in De Witt County, Illinois.
Overnight
63°F
Mostly Clear
Mostly clear, with a low around 63. South southeast wind around 5 mph.
7-day forecast for Clinton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Mostly Clear | 5 mph SSE | 0% |
| Tuesday | 85°F | Sunny | 6 mph S | 0% |
| Tuesday Night | 66°F | Mostly Clear | 6 mph SSE | 1% |
| Wednesday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 9 mph SSW | 18% |
| Wednesday Night | 67°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms | 7 mph SSE | 80% |
| Thursday | 81°F | Showers And Thunderstorms | 8 mph SSW | 80% |
| Thursday Night | 65°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph S | 22% |
| Friday | 83°F | Mostly Sunny | 6 mph SSW | 9% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 5 mph SSW | 26% |
| Saturday | 85°F | Mostly Sunny | 5 to 9 mph SSW | 14% |
| Saturday Night | 70°F | Mostly Clear | 10 mph S | 12% |
| Sunday | 87°F | Sunny | 10 to 15 mph SSW | 8% |
| Sunday Night | 71°F | Partly Cloudy | 10 to 15 mph SSW | 11% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms | 10 to 14 mph SSW | 16% |
Forecast source: National Weather Service (api.weather.gov) for Clinton (40.147, -88.963). Updated through the day.
Growing snapshot for Clinton
Last spring frost
Apr 20
First fall frost
Oct 16
Growing season
179 days
Hardiness zone
6a
More local growing data for Clinton: nearby ZIP 61727 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Lincoln, Il (20.4 mi from Clinton). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.