Grantfork, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantfork, a village in Madison County, Illinois.
Today
85°F
Patchy Fog then Sunny
Patchy fog before 7am. Sunny, with a high near 85. Southeast wind around 2 mph.
7-day forecast for Grantfork
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Patchy Fog then Sunny | 2 mph SE | 0% |
| Tonight | 66°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 88°F | Sunny | 1 to 5 mph S | 8% |
| Wednesday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 mph S | 63% |
| Thursday | 84°F | Showers And Thunderstorms | 5 mph S | 75% |
| Thursday Night | 68°F | Chance Showers And Thunderstorms | 3 mph SE | 35% |
| Friday | 85°F | Chance Showers And Thunderstorms | 3 mph SW | 35% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 2 mph S | 33% |
| Saturday | 87°F | Chance Showers And Thunderstorms then Mostly Sunny | 0 to 3 mph S | 33% |
| Saturday Night | 71°F | Mostly Clear | 5 mph S | 10% |
| Sunday | 89°F | Sunny | 5 to 9 mph S | 8% |
| Sunday Night | 73°F | Mostly Clear | 6 to 9 mph S | 5% |
| Monday | 91°F | Sunny | 5 to 8 mph S | 5% |
| Monday Night | 74°F | Slight Chance Showers And Thunderstorms | 8 mph S | 15% |
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
Nearby towns & communities
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Wood River
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 Aug 4, 2026.