Leaf River, IL Weather & Growing Conditions
Today
85°F
Mostly Sunny
Mostly sunny. High near 85, with temperatures falling to around 83 in the afternoon. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 to 10 mph SSW | 10% |
| Tonight | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 74% |
| Wednesday | 75°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 74% |
| Wednesday Night | 59°F | Showers And Thunderstorms Likely | 0 to 5 mph NW | 72% |
| Thursday | 78°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 34% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 11% |
| Friday | 80°F | Mostly Sunny | 0 to 5 mph SSE | 7% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph S | 7% |
| Saturday | 83°F | Mostly Sunny | 5 to 10 mph SSW | 10% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 21% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 21% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SSW | 41% |
| Monday | 83°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 38% |
| Monday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph WNW | 43% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Leaf River, IL
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5b
Explore more for Leaf River, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Polo 5Nw, Il (13.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.