Belknap, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belknap, a village in Massac County, Illinois.
This Afternoon
78°F
Slight Chance Rain Showers
A slight chance of rain showers. Mostly cloudy. High near 78, with temperatures falling to around 74 in the afternoon. South wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast for Belknap
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Slight Chance Rain Showers | 10 mph S | 21% |
| Tonight | 56°F | Showers And Thunderstorms | 6 to 12 mph S | 99% |
| Wednesday | 69°F | Partly Sunny | 3 to 8 mph SW | 7% |
| Wednesday Night | 42°F | Mostly Clear | 2 mph WSW | 0% |
| Thursday | 69°F | Sunny | 0 to 6 mph SW | 0% |
| Thursday Night | 44°F | Partly Cloudy | 2 mph NW | 4% |
| Friday | 62°F | Partly Sunny | 2 to 7 mph NNW | 2% |
| Friday Night | 38°F | Partly Cloudy | 3 mph NNW | 1% |
| Saturday | 58°F | Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 34°F | Partly Cloudy | 0 mph | 1% |
| Sunday | 62°F | Sunny | 0 to 5 mph WNW | 5% |
| Sunday Night | 33°F | Mostly Clear | 1 mph NW | 6% |
| Monday | 64°F | Sunny | 1 to 5 mph W | 1% |
| Monday Night | 36°F | Mostly Clear | 1 mph WNW | 0% |
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 Nov 4, 2026.