Allendale, IL Weather & Growing Conditions
Overnight
71°F
Partly Cloudy
Partly cloudy. Low around 71, with temperatures rising to around 73 overnight. Southeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 71°F | Partly Cloudy | 3 mph SE | 2% |
| Saturday | 97°F | Sunny then Slight Chance Rain Showers | 3 to 7 mph SSW | 16% |
| Saturday Night | 72°F | Partly Cloudy | 6 mph SSW | 10% |
| Sunday | 95°F | Mostly Sunny | 5 to 8 mph W | 14% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 9 mph NNE | 45% |
| Monday | 82°F | Showers And Thunderstorms Likely | 8 to 12 mph NE | 56% |
| Monday Night | 59°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 8 to 13 mph NNE | 56% |
| Tuesday | 74°F | Chance Showers And Thunderstorms | 12 mph NNE | 31% |
| Tuesday Night | 57°F | Mostly Cloudy | 6 to 12 mph N | 14% |
| Wednesday | 75°F | Mostly Sunny | 6 to 10 mph N | 4% |
| Wednesday Night | 56°F | Partly Cloudy | 3 to 10 mph N | 4% |
| Thursday | 76°F | Mostly Sunny | 5 to 9 mph N | 3% |
| Thursday Night | 57°F | Partly Cloudy | 3 to 9 mph NNE | 4% |
| Friday | 77°F | Mostly Sunny | 5 to 10 mph NNE | 3% |
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 Sep 19, 2026.