Smithboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithboro, a village in Bond County, Illinois.
Today
85°F
Sunny
Sunny, with a high near 85. South wind around 2 mph.
7-day forecast for Smithboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 2 mph S | 0% |
| Tonight | 65°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 87°F | Sunny | 0 to 5 mph S | 5% |
| Wednesday Night | 69°F | Mostly Cloudy then Showers And Thunderstorms Likely | 3 mph S | 55% |
| Thursday | 84°F | Showers And Thunderstorms Likely | 5 mph SW | 70% |
| Thursday Night | 68°F | Chance Showers And Thunderstorms | 0 to 3 mph SE | 49% |
| Friday | 85°F | Chance Showers And Thunderstorms | 3 mph SW | 32% |
| Friday Night | 68°F | Chance Showers And Thunderstorms | 2 mph S | 28% |
| Saturday | 86°F | Chance Showers And Thunderstorms | 1 to 5 mph S | 28% |
| 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 | 90°F | Sunny | 5 to 9 mph SW | 6% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 8 mph S | 15% |
Forecast source: National Weather Service (api.weather.gov) for Smithboro (38.895, -89.340). Updated through the day.
Growing snapshot for Smithboro
Last spring frost
Apr 10
First fall frost
Oct 24
Growing season
196 days
Hardiness zone
6b
More local growing data for Smithboro: nearby ZIP 62284 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Vandalia, Il (13.3 mi from Smithboro). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.