Allerton, IL Weather & Growing Conditions
Today
84°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 84. South wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Patchy Fog then Sunny | 1 to 5 mph S | 0% |
| Tonight | 64°F | Mostly Clear | 3 mph SSE | 0% |
| Wednesday | 85°F | Sunny | 6 mph S | 1% |
| Wednesday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph S | 44% |
| Thursday | 82°F | Showers And Thunderstorms Likely | 6 mph SSW | 73% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms | 3 mph S | 40% |
| Friday | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 3 mph SSW | 25% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 2 mph SSW | 25% |
| Saturday | 85°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph SSW | 17% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 to 7 mph SSW | 15% |
| Sunday | 87°F | Sunny | 7 to 12 mph SSW | 10% |
| Sunday Night | 71°F | Partly Cloudy | 10 mph SSW | 11% |
| Monday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 10 mph SSW | 18% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 mph SW | 28% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Allerton, IL
Last spring frost
Apr 19
First fall frost
Oct 19
Growing season
181 days
Hardiness zone
6a
Explore more for Allerton, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Sidell 4N, Il (6.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.