Grafton, IL Weather & Growing Conditions
Today
96°F
Partly Sunny
Partly sunny, with a high near 96. Southwest wind 6 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 96°F | Partly Sunny | 6 to 9 mph SW | 5% |
| Tonight | 73°F | Partly Cloudy | 6 mph SW | 5% |
| Sunday | 90°F | Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 8 mph NW | 43% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 to 12 mph NE | 71% |
| Monday | 75°F | Showers And Thunderstorms Likely | 9 to 13 mph NE | 71% |
| Monday Night | 59°F | Chance Showers And Thunderstorms | 9 to 14 mph NE | 28% |
| Tuesday | 69°F | Slight Chance Rain Showers then Partly Sunny | 13 mph NE | 21% |
| Tuesday Night | 54°F | Mostly Cloudy | 7 to 13 mph N | 5% |
| Wednesday | 73°F | Mostly Sunny | 10 mph N | 0% |
| Wednesday Night | 55°F | Partly Cloudy | 5 to 9 mph NE | 0% |
| Thursday | 75°F | Mostly Sunny | 8 mph N | 3% |
| Thursday Night | 57°F | Partly Cloudy | 5 to 8 mph NE | 3% |
| Friday | 76°F | Mostly Sunny | 5 to 8 mph NE | 7% |
| Friday Night | 58°F | Partly Cloudy | 7 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grafton, IL
Last spring frost
Apr 5
First fall frost
Oct 27
Growing season
203 days
Hardiness zone
6b
Explore more for Grafton, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, St Charles Co Ap, Mo (6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.