Belknap, IL Weather & Growing Conditions
Overnight
56°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 2am, then a slight chance of showers and thunderstorms between 2am and 5am. Mostly cloudy. Low around 56, with temperatures rising to around 59 overnight. South southwest wind around 7 mph. Chance of precipitation is 60%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Showers And Thunderstorms Likely | 7 mph SSW | 57% |
| Wednesday | 67°F | Partly Sunny | 3 to 9 mph WSW | 7% |
| Wednesday Night | 43°F | Mostly Clear | 2 mph WSW | 0% |
| Thursday | 69°F | Sunny | 1 to 7 mph SW | 0% |
| Thursday Night | 44°F | Partly Cloudy | 1 mph WNW | 0% |
| Friday | 62°F | Partly Sunny | 2 to 9 mph NNW | 0% |
| Friday Night | 37°F | Partly Cloudy | 5 mph N | 0% |
| Saturday | 58°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 | 65°F | Sunny | 0 to 3 mph WSW | 0% |
| Monday Night | 36°F | Clear | 1 mph W | 1% |
| Tuesday | 69°F | Sunny | 0 to 5 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Belknap, IL
Last spring frost
Apr 3
First fall frost
Nov 5
Growing season
216 days
Hardiness zone
7a
Explore more for Belknap, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Grand Chain Dam 53, Il (12.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.