Sumner, IL Weather & Growing Conditions
This Afternoon
95°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Sunny, with a high near 95. West southwest wind around 9 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 95°F | Slight Chance Showers And Thunderstorms | 9 mph WSW | 15% |
| Tonight | 71°F | Partly Cloudy | 3 to 7 mph S | 12% |
| Sunday | 94°F | Mostly Sunny | 6 to 10 mph W | 7% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 7 to 10 mph NNE | 49% |
| Monday | 81°F | Chance Showers And Thunderstorms | 7 to 12 mph NE | 49% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 8 to 12 mph NE | 46% |
| Tuesday | 74°F | Chance Showers And Thunderstorms | 12 mph NNE | 33% |
| Tuesday Night | 57°F | Mostly Cloudy | 7 to 12 mph NNE | 13% |
| Wednesday | 74°F | Partly Sunny | 7 to 10 mph N | 10% |
| Wednesday Night | 56°F | Partly Cloudy | 5 to 10 mph N | 4% |
| Thursday | 76°F | Partly Sunny | 5 to 8 mph N | 1% |
| Thursday Night | 58°F | Mostly Cloudy | 3 to 8 mph NNE | 1% |
| Friday | 78°F | Partly Sunny | 5 to 9 mph NNE | 3% |
| Friday Night | 57°F | Partly Cloudy | 5 to 8 mph NNE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sumner, IL
Last spring frost
Apr 12
First fall frost
Oct 25
Growing season
193 days
Hardiness zone
6b
Explore more for Sumner, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Lawrenceville 2Wsw, Il (7.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.