Sumner, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sumner, a city in Lawrence County, Illinois.
This Afternoon
100°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly sunny. High near 100, with temperatures falling to around 86 in the afternoon. Northeast wind around 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sumner
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 100°F | Chance Showers And Thunderstorms | 7 mph NE | 30% |
| Tonight | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 7 mph E | 24% |
| Saturday | 96°F | Mostly Sunny | 5 to 9 mph SSW | 12% |
| Saturday Night | 72°F | Partly Cloudy | 3 to 7 mph S | 9% |
| Sunday | 95°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 8 mph W | 16% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 8 mph NNE | 33% |
| Monday | 83°F | Chance Rain Showers | 8 to 13 mph NE | 49% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 9 to 14 mph NNE | 49% |
| Tuesday | 75°F | Chance Showers And Thunderstorms | 10 to 14 mph NNE | 41% |
| Tuesday Night | 57°F | Mostly Cloudy | 7 to 14 mph NNE | 10% |
| Wednesday | 75°F | Partly Sunny | 7 to 10 mph NNE | 4% |
| Wednesday Night | 56°F | Partly Cloudy | 5 to 10 mph NNE | 4% |
| Thursday | 76°F | Mostly Sunny | 5 to 9 mph N | 4% |
| Thursday Night | 58°F | Partly Cloudy | 5 to 9 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Sumner (38.715, -87.867). Updated through the day.
Growing snapshot for Sumner
Last spring frost
Apr 12
First fall frost
Oct 25
Growing season
193 days
Hardiness zone
6b
More local growing data for Sumner: nearby ZIP 62466 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Lawrenceville 2Wsw, Il (7.2 mi from Sumner). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.