Sumner, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sumner, a city in Lawrence County, Illinois.
Today
86°F
Sunny
Sunny, with a high near 86. East wind around 3 mph.
7-day forecast for Sumner
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 3 mph E | 0% |
| Tonight | 64°F | Mostly Clear | 3 mph ESE | 0% |
| Wednesday | 88°F | Sunny | 0 to 3 mph S | 0% |
| Wednesday Night | 68°F | Partly Cloudy | 3 mph S | 6% |
| Thursday | 86°F | Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 8 mph SSW | 33% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph S | 58% |
| Friday | 86°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 38% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 1 to 5 mph SSW | 32% |
| Saturday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 2 to 6 mph SSW | 30% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph S | 23% |
| Sunday | 89°F | Mostly Sunny | 5 to 10 mph SSW | 12% |
| Sunday Night | 72°F | Mostly Clear | 8 mph SSW | 12% |
| Monday | 90°F | Sunny | 7 to 10 mph SSW | 11% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 8 mph SSW | 21% |
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 Aug 4, 2026.