Grantfork, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantfork, a village in Madison County, Illinois.
This Afternoon
95°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 95. Heat index values as high as 102. East wind around 3 mph. Chance of precipitation is 30%.
7-day forecast for Grantfork
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 95°F | Chance Showers And Thunderstorms | 3 mph E | 26% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 mph SE | 23% |
| Saturday | 95°F | Mostly Sunny | 2 to 7 mph SW | 6% |
| Saturday Night | 72°F | Partly Cloudy | 3 mph S | 2% |
| Sunday | 92°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 1 to 7 mph W | 20% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms | 8 mph N | 53% |
| Monday | 79°F | Showers And Thunderstorms Likely | 6 to 12 mph NE | 65% |
| Monday Night | 59°F | Showers And Thunderstorms Likely | 7 to 13 mph NE | 65% |
| Tuesday | 72°F | Slight Chance Rain Showers then Mostly Cloudy | 9 to 13 mph N | 24% |
| Tuesday Night | 54°F | Mostly Cloudy | 5 to 13 mph N | 5% |
| Wednesday | 74°F | Mostly Sunny | 6 to 10 mph N | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 9 mph N | 3% |
| Thursday | 76°F | Mostly Sunny | 2 to 8 mph N | 2% |
| Thursday Night | 56°F | Partly Cloudy | 2 to 8 mph N | 2% |
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 Sep 18, 2026.