Clayton, IL Weather & Growing Conditions
Today
88°F
Mostly Sunny
Mostly sunny, with a high near 88. South wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Mostly Sunny | 7 mph S | 0% |
| Tonight | 69°F | Partly Cloudy | 6 mph S | 14% |
| Wednesday | 85°F | Partly Sunny then Scattered Showers And Thunderstorms | 5 mph S | 47% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 mph NE | 90% |
| Thursday | 82°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph S | 90% |
| Thursday Night | 65°F | Partly Cloudy | 3 mph SE | 10% |
| Friday | 85°F | Mostly Sunny | 2 mph S | 7% |
| Friday Night | 67°F | Chance Showers And Thunderstorms | 3 mph S | 30% |
| Saturday | 88°F | Slight Chance Showers And Thunderstorms then Sunny | 6 mph SW | 24% |
| Saturday Night | 72°F | Mostly Clear | 5 to 10 mph S | 6% |
| Sunday | 90°F | Sunny | 9 to 13 mph SW | 3% |
| Sunday Night | 72°F | Mostly Clear | 10 mph S | 11% |
| Monday | 90°F | Mostly Sunny | 12 mph SW | 11% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 10 mph S | 26% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Clayton, IL
Last spring frost
Apr 18
First fall frost
Oct 21
Growing season
187 days
Hardiness zone
6a
Explore more for Clayton, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Golden, Il (8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.