Smithboro, IL Weather & Growing Conditions
Today
86°F
Sunny
Sunny, with a high near 86. South wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 3 mph S | 0% |
| Tonight | 65°F | Mostly Clear | 0 to 3 mph SE | 0% |
| Wednesday | 87°F | Sunny | 0 to 5 mph S | 5% |
| Wednesday Night | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 3 mph S | 52% |
| Thursday | 84°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph SW | 68% |
| Thursday Night | 68°F | Chance Showers And Thunderstorms | 0 to 3 mph SE | 49% |
| Friday | 85°F | Chance Showers And Thunderstorms | 3 mph SW | 33% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 1 mph S | 27% |
| Saturday | 87°F | Chance Showers And Thunderstorms | 3 mph S | 27% |
| Saturday Night | 71°F | Mostly Clear | 3 mph S | 12% |
| Sunday | 89°F | Sunny | 3 to 9 mph SW | 7% |
| Sunday Night | 73°F | Mostly Clear | 5 to 9 mph S | 5% |
| Monday | 91°F | Sunny | 5 to 8 mph SW | 6% |
| Monday Night | 74°F | Slight Chance Showers And Thunderstorms | 7 mph S | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Smithboro, IL
Last spring frost
Apr 10
First fall frost
Oct 24
Growing season
196 days
Hardiness zone
6b
Explore more for Smithboro, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Vandalia, Il (13.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.