Sumner, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sumner, a city in Lawrence County, Illinois.
Tonight
59°F
Rain then Rain Showers
Rain and a slight chance of thunderstorms before midnight, then rain showers. Mostly cloudy, with a low around 59. South wind 13 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Sumner
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Rain then Rain Showers | 13 to 18 mph S | 94% |
| Wednesday | 68°F | Slight Chance Light Rain then Partly Sunny | 8 to 14 mph SW | 26% |
| Wednesday Night | 45°F | Mostly Cloudy | 6 mph WSW | 0% |
| Thursday | 67°F | Sunny | 5 to 12 mph WSW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 1 to 5 mph WNW | 4% |
| Friday | 60°F | Mostly Cloudy | 3 to 10 mph NNW | 4% |
| Friday Night | 39°F | Partly Cloudy | 3 to 7 mph NNW | 4% |
| Saturday | 57°F | Mostly Sunny | 6 mph NNW | 1% |
| Saturday Night | 35°F | Partly Cloudy | 2 mph WNW | 2% |
| Sunday | 61°F | Sunny | 1 to 8 mph W | 6% |
| Sunday Night | 35°F | Mostly Clear | 2 to 6 mph WNW | 6% |
| Monday | 64°F | Sunny | 2 to 9 mph W | 3% |
| Monday Night | 39°F | Mostly Clear | 6 mph SW | 1% |
| Tuesday | 68°F | Sunny | 3 to 7 mph WSW | 1% |
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 Nov 4, 2026.