Mascoutah, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mascoutah, a city in St. Clair County, Illinois.
Today
88°F
Sunny
Sunny, with a high near 88. Southeast wind 0 to 3 mph.
7-day forecast for Mascoutah
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 0 to 3 mph SE | 0% |
| Tonight | 67°F | Mostly Clear | 3 mph SE | 0% |
| Wednesday | 90°F | Sunny | 0 to 5 mph S | 5% |
| Wednesday Night | 71°F | Mostly Cloudy then Showers And Thunderstorms Likely | 6 mph S | 58% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 5 mph S | 71% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 3 mph SE | 49% |
| Friday | 87°F | Chance Showers And Thunderstorms | 3 mph SW | 49% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 2 mph SW | 37% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 0 to 3 mph S | 37% |
| Saturday Night | 72°F | Partly Cloudy | 6 mph S | 10% |
| Sunday | 91°F | Sunny | 5 to 8 mph S | 7% |
| Sunday Night | 74°F | Mostly Clear | 6 to 9 mph S | 5% |
| Monday | 93°F | Sunny | 5 to 9 mph S | 5% |
| Monday Night | 75°F | Slight Chance Showers And Thunderstorms | 9 mph S | 15% |
Forecast source: National Weather Service (api.weather.gov) for Mascoutah (38.518, -89.800). Updated through the day.
Growing snapshot for Mascoutah
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
6b
More local growing data for Mascoutah: nearby ZIP 62225 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
Millstadt
New Athens
O'Fallon
Paderborn
Rentchler
Sauget
Scott AFB
Shiloh
Smithton
St. Libory
Summerfield
Swansea
Washington Park
Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (1.6 mi from Mascoutah). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.