Smithboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithboro, a village in Bond County, Illinois.
This Afternoon
95°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Sunny, with a high near 95. Heat index values as high as 102. Northeast wind around 3 mph. Chance of precipitation is 30%.
7-day forecast for Smithboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 95°F | Chance Showers And Thunderstorms | 3 mph NE | 26% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SE | 24% |
| Saturday | 96°F | Mostly Sunny | 3 to 7 mph SW | 7% |
| Saturday Night | 71°F | Mostly Cloudy | 3 mph S | 3% |
| Sunday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 7 mph W | 20% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms | 5 to 8 mph N | 47% |
| Monday | 79°F | Showers And Thunderstorms Likely | 6 to 10 mph NE | 60% |
| Monday Night | 58°F | Showers And Thunderstorms Likely | 6 to 12 mph NE | 60% |
| Tuesday | 72°F | Slight Chance Rain Showers then Partly Sunny | 12 mph N | 24% |
| Tuesday Night | 54°F | Mostly Cloudy | 5 to 12 mph N | 5% |
| Wednesday | 74°F | Mostly Sunny | 6 to 9 mph N | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 8 mph N | 3% |
| Thursday | 76°F | Mostly Sunny | 3 to 8 mph N | 2% |
| Thursday Night | 56°F | Partly Cloudy | 2 to 7 mph NE | 2% |
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 Sep 18, 2026.