Allendale, IL Weather & Growing Conditions
This Afternoon
78°F
Mostly Sunny
Mostly sunny. High near 78, with temperatures falling to around 75 in the afternoon. South wind around 20 mph, with gusts as high as 26 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Mostly Sunny | 20 mph S | 2% |
| Tonight | 60°F | Rain Showers | 12 to 18 mph S | 95% |
| Wednesday | 68°F | Chance Rain Showers then Partly Sunny | 8 to 14 mph SW | 35% |
| Wednesday Night | 46°F | Mostly Cloudy | 5 mph WSW | 0% |
| Thursday | 67°F | Sunny | 5 to 12 mph WSW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 3 mph WNW | 3% |
| Friday | 60°F | Partly Sunny | 3 to 9 mph NNW | 4% |
| Friday Night | 40°F | Partly Cloudy | 3 to 7 mph NNW | 3% |
| Saturday | 56°F | Mostly Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 1 mph NW | 2% |
| Sunday | 60°F | Mostly Sunny | 1 to 7 mph W | 7% |
| Sunday Night | 35°F | Mostly Clear | 5 mph WNW | 6% |
| Monday | 63°F | Sunny | 2 to 8 mph W | 3% |
| Monday Night | 39°F | Mostly Clear | 5 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Allendale, IL
Last spring frost
Apr 2
First fall frost
Oct 31
Growing season
209 days
Hardiness zone
6b
Explore more for Allendale, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mt Carmel, Il (9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.