Smithton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithton, a village in St. Clair County, Illinois.
This Afternoon
73°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 73, with temperatures falling to around 67 in the afternoon. South wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
7-day forecast for Smithton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Rain | 15 mph S | 91% |
| Tonight | 54°F | Rain | 7 to 15 mph S | 97% |
| Wednesday | 65°F | Mostly Cloudy | 6 to 13 mph W | 8% |
| Wednesday Night | 44°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 67°F | Sunny | 3 to 9 mph W | 1% |
| Thursday Night | 45°F | Mostly Cloudy | 5 mph NW | 8% |
| Friday | 58°F | Partly Sunny | 5 to 10 mph NW | 5% |
| Friday Night | 39°F | Partly Cloudy | 2 to 6 mph N | 1% |
| Saturday | 56°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 62°F | Sunny | 1 to 6 mph W | 7% |
| Sunday Night | 36°F | Mostly Clear | 3 mph W | 5% |
| Monday | 66°F | Sunny | 2 to 6 mph SW | 2% |
| Monday Night | 41°F | Mostly Clear | 3 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Smithton (38.414, -89.990). Updated through the day.
Growing snapshot for Smithton
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
7a
More local growing data for Smithton: nearby ZIP 62285 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (12.4 mi from Smithton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.