Allerton, IL Weather & Growing Conditions
Today
88°F
Showers And Thunderstorms then Chance Showers And Thunderstorms
Showers and thunderstorms before noon, then a chance of showers and thunderstorms between noon and 1pm, then a chance of showers and thunderstorms between 1pm and 2pm, then a slight chance of showers and thunderstorms between 2pm and 3pm. Mostly cloudy, with a high near 88. South southwest wind around 7 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 7 mph SSW | 79% |
| Tonight | 69°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 6 mph S | 15% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 3 to 10 mph N | 54% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 14 mph NE | 63% |
| Monday | 69°F | Showers And Thunderstorms Likely | 13 to 16 mph NE | 71% |
| Monday Night | 54°F | Chance Rain Showers | 12 to 17 mph NE | 51% |
| Tuesday | 67°F | Chance Showers And Thunderstorms | 14 mph NE | 28% |
| Tuesday Night | 52°F | Chance Showers And Thunderstorms then Mostly Cloudy | 8 to 14 mph NNE | 28% |
| Wednesday | 70°F | Mostly Sunny | 10 mph NNE | 6% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 9 mph NNE | 6% |
| Thursday | 71°F | Partly Sunny | 8 mph NNE | 2% |
| Thursday Night | 54°F | Partly Cloudy | 7 mph NNE | 2% |
| Friday | 74°F | Mostly Sunny | 6 to 9 mph NNE | 2% |
| Friday Night | 53°F | Partly Cloudy | 5 to 8 mph NE | 2% |
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 Sep 19, 2026.