Belknap, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belknap, a village in Massac County, Illinois.
Today
87°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny. High near 87, with temperatures falling to around 85 in the afternoon. Northeast wind around 2 mph.
7-day forecast for Belknap
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Patchy Fog then Sunny | 2 mph NE | 0% |
| Tonight | 64°F | Mostly Clear | 1 mph NE | 0% |
| Wednesday | 88°F | Sunny | 1 mph SSW | 0% |
| Wednesday Night | 68°F | Mostly Clear | 0 mph | 0% |
| Thursday | 89°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 1 to 5 mph SSW | 15% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 2 mph S | 54% |
| Friday | 88°F | Chance Showers And Thunderstorms | 1 to 5 mph SSW | 54% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph SW | 42% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 0 to 3 mph SSW | 33% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 mph SSW | 22% |
| Sunday | 90°F | Mostly Sunny | 1 to 6 mph SSW | 10% |
| Sunday Night | 71°F | Mostly Clear | 3 mph SSW | 6% |
| Monday | 91°F | Sunny | 1 to 7 mph SSW | 4% |
| Monday Night | 73°F | Mostly Clear | 1 to 5 mph SSW | 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 Aug 4, 2026.