Allendale, IL Weather & Growing Conditions
Today
85°F
Sunny
Sunny. High near 85, with temperatures falling to around 83 in the afternoon. East northeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 3 mph ENE | 0% |
| Tonight | 64°F | Mostly Clear | 2 mph ENE | 0% |
| Wednesday | 87°F | Sunny | 2 mph SW | 0% |
| Wednesday Night | 68°F | Partly Cloudy | 2 mph S | 4% |
| Thursday | 87°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 2 to 7 mph SSW | 22% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 5 mph S | 48% |
| Friday | 86°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 48% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 3 mph SSW | 36% |
| Saturday | 87°F | Chance Showers And Thunderstorms | 2 to 6 mph SSW | 34% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 mph S | 25% |
| Sunday | 89°F | Mostly Sunny | 3 to 9 mph SSW | 12% |
| Sunday Night | 72°F | Mostly Clear | 8 mph SSW | 12% |
| Monday | 90°F | Sunny | 5 to 10 mph SSW | 10% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 8 mph SSW | 18% |
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 Aug 4, 2026.