Grantfork, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantfork, a village in Madison County, Illinois.
This Afternoon
72°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 72, with temperatures falling to around 67 in the afternoon. South wind around 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
7-day forecast for Grantfork
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Rain | 13 mph S | 87% |
| Tonight | 54°F | Rain | 9 to 16 mph S | 98% |
| Wednesday | 63°F | Chance Rain Showers then Mostly Cloudy | 8 to 15 mph W | 12% |
| Wednesday Night | 42°F | Partly Cloudy | 6 mph SW | 0% |
| Thursday | 65°F | Sunny | 5 to 13 mph W | 0% |
| Thursday Night | 43°F | Mostly Cloudy | 5 mph NW | 5% |
| Friday | 58°F | Mostly Cloudy | 5 to 10 mph NW | 7% |
| Friday Night | 37°F | Partly Cloudy | 2 to 7 mph N | 1% |
| Saturday | 55°F | Mostly Sunny | 5 mph NW | 0% |
| Saturday Night | 34°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 61°F | Sunny | 1 to 7 mph W | 6% |
| Sunday Night | 34°F | Mostly Clear | 1 to 5 mph NW | 4% |
| Monday | 65°F | Sunny | 1 to 8 mph W | 2% |
| Monday Night | 39°F | Mostly Clear | 3 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Grantfork (38.826, -89.667). Updated through the day.
Growing snapshot for Grantfork
Last spring frost
Apr 6
First fall frost
Oct 29
Growing season
204 days
Hardiness zone
6b
More local growing data for Grantfork: nearby ZIP 62249 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Carlyle Rsvr, Il (18.7 mi from Grantfork). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.