Smithton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithton, a village in St. Clair County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. Southeast wind around 5 mph.
7-day forecast for Smithton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 5 mph SE | 0% |
| Tonight | 66°F | Mostly Clear | 1 to 6 mph SE | 0% |
| Wednesday | 89°F | Sunny | 1 to 5 mph S | 5% |
| Wednesday Night | 70°F | Slight Chance Showers And Thunderstorms | 6 mph S | 55% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 5 mph S | 68% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 3 mph S | 48% |
| Friday | 87°F | Chance Showers And Thunderstorms | 3 mph SW | 48% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph SW | 38% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 3 mph S | 38% |
| Saturday Night | 71°F | Partly Cloudy | 5 mph S | 9% |
| Sunday | 91°F | Sunny | 7 mph S | 7% |
| Sunday Night | 73°F | Mostly Clear | 7 mph S | 5% |
| Monday | 93°F | Sunny | 5 to 8 mph SW | 5% |
| Monday Night | 74°F | Mostly Clear | 8 mph SW | 12% |
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
Nearby towns & communities
Belleville
Brooklyn
Cahokia Heights
Caseyville
Darmstadt
Dupo
East St. Louis
Fairmont City
Fairview Heights
Fayetteville
Floraville
Freeburg
Lebanon
Lenzburg
Marissa
Mascoutah
Millstadt
New Athens
O'Fallon
Paderborn
Rentchler
Sauget
Scott AFB
Shiloh
St. Libory
Summerfield
Swansea
Washington Park
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 Aug 4, 2026.