Smithboro, IL Weather & Growing Conditions
This Afternoon
74°F
Slight Chance T-storms
A slight chance of thunderstorms and a slight chance of rain before 3pm, then rain likely and a slight chance of thunderstorms. Cloudy, with a high near 74. South wind 18 to 22 mph, with gusts as high as 31 mph. Chance of precipitation is 70%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Slight Chance T-storms | 18 to 22 mph S | 65% |
| Tonight | 54°F | Rain | 10 to 16 mph S | 97% |
| Wednesday | 64°F | Chance Rain Showers then Mostly Cloudy | 7 to 14 mph SW | 12% |
| Wednesday Night | 42°F | Partly Cloudy | 6 mph SW | 0% |
| Thursday | 66°F | Sunny | 5 to 12 mph W | 0% |
| Thursday Night | 42°F | Mostly Cloudy | 3 mph NW | 4% |
| Friday | 58°F | Mostly Cloudy | 5 to 10 mph NW | 7% |
| Friday Night | 36°F | Partly Cloudy | 2 to 6 mph N | 1% |
| Saturday | 56°F | Mostly Sunny | 3 mph NW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 61°F | Sunny | 1 to 7 mph W | 6% |
| Sunday Night | 33°F | Mostly Clear | 3 mph NW | 5% |
| Monday | 65°F | Sunny | 1 to 9 mph SW | 2% |
| Monday Night | 38°F | Mostly Clear | 3 mph SW | 1% |
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 Nov 3, 2026.