Belknap, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belknap, a village in Massac County, Illinois.
Overnight
56°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 2am, then a slight chance of showers and thunderstorms between 2am and 3am. Mostly cloudy. Low around 56, with temperatures rising to around 59 overnight. South southwest wind around 6 mph. Chance of precipitation is 40%.
7-day forecast for Belknap
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Chance Showers And Thunderstorms | 6 mph SSW | 36% |
| Wednesday | 67°F | Partly Sunny | 3 to 8 mph WSW | 7% |
| Wednesday Night | 42°F | Mostly Clear | 2 mph WSW | 0% |
| Thursday | 68°F | Sunny | 1 to 6 mph SW | 0% |
| Thursday Night | 44°F | Partly Cloudy | 1 mph NW | 0% |
| Friday | 61°F | Partly Sunny | 2 to 8 mph NNW | 0% |
| Friday Night | 36°F | Partly Cloudy | 5 mph N | 0% |
| Saturday | 57°F | Mostly Sunny | 5 mph N | 0% |
| Saturday Night | 33°F | Partly Cloudy | 1 mph N | 0% |
| Sunday | 61°F | Sunny | 0 to 5 mph NNW | 0% |
| Sunday Night | 33°F | Clear | 1 mph N | 0% |
| Monday | 64°F | Sunny | 0 to 3 mph WSW | 0% |
| Monday Night | 36°F | Clear | 0 mph | 1% |
| Tuesday | 68°F | Sunny | 0 to 3 mph W | 1% |
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.