Belknap, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belknap, a village in Massac County, Illinois.
Tonight
72°F
Mostly Clear
Mostly clear, with a low around 72. North northeast wind around 1 mph.
7-day forecast for Belknap
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 72°F | Mostly Clear | 1 mph NNE | 10% |
| Saturday | 98°F | Sunny | 0 to 5 mph WSW | 3% |
| Saturday Night | 72°F | Mostly Clear | 2 mph SSW | 1% |
| Sunday | 97°F | Sunny | 1 to 5 mph WSW | 2% |
| Sunday Night | 68°F | Partly Cloudy | 2 mph NNW | 4% |
| Monday | 90°F | Partly Sunny then Chance Showers And Thunderstorms | 1 to 5 mph N | 39% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 2 to 6 mph NNE | 39% |
| Tuesday | 78°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 5 to 9 mph N | 19% |
| Tuesday Night | 59°F | Partly Cloudy | 3 to 9 mph N | 7% |
| Wednesday | 77°F | Mostly Sunny | 6 mph N | 4% |
| Wednesday Night | 58°F | Partly Cloudy | 5 mph NNE | 3% |
| Thursday | 77°F | Mostly Sunny | 2 to 6 mph NNE | 3% |
| Thursday Night | 59°F | Partly Cloudy | 5 mph NNE | 3% |
| Friday | 78°F | Mostly Sunny | 2 to 7 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Belknap (37.323, -88.940). Updated through the day.
Growing snapshot for Belknap
Last spring frost
Apr 3
First fall frost
Nov 5
Growing season
216 days
Hardiness zone
7a
More local growing data for Belknap: nearby ZIP 62956 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Grand Chain Dam 53, Il (8.1 mi from Belknap). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.