Allerton, IL Weather & Growing Conditions
Overnight
60°F
Light Rain Likely
Rain likely. Cloudy, with a low around 60. South wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Light Rain Likely | 16 mph S | 58% |
| Wednesday | 64°F | Chance Light Rain then Patchy Drizzle | 12 to 15 mph SW | 34% |
| Wednesday Night | 46°F | Patchy Drizzle then Mostly Cloudy | 10 mph SW | 10% |
| Thursday | 62°F | Partly Sunny | 10 to 15 mph WSW | 9% |
| Thursday Night | 43°F | Mostly Cloudy | 6 mph WNW | 9% |
| Friday | 54°F | Mostly Cloudy | 6 to 10 mph NNW | 9% |
| Friday Night | 34°F | Partly Cloudy | 3 to 8 mph NNW | 0% |
| Saturday | 53°F | Sunny | 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 2 mph WNW | 1% |
| Sunday | 59°F | Sunny | 2 to 7 mph WNW | 2% |
| Sunday Night | 33°F | Clear | 3 mph W | 0% |
| Monday | 63°F | Sunny | 2 to 6 mph SW | 0% |
| Monday Night | 38°F | Clear | 5 mph SW | 1% |
| Tuesday | 66°F | Sunny | 5 mph W | 1% |
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 Nov 4, 2026.