Cahokia Heights, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cahokia Heights, a city in St. Clair County, Illinois.
Today
88°F
Sunny
Sunny, with a high near 88. South wind 0 to 5 mph.
7-day forecast for Cahokia Heights
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 0 to 5 mph S | 0% |
| Tonight | 67°F | Mostly Clear | 0 to 6 mph SE | 0% |
| Wednesday | 91°F | Sunny | 0 to 7 mph S | 7% |
| Wednesday Night | 71°F | Slight Chance Showers And Thunderstorms | 7 mph S | 63% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 6 mph S | 69% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 38% |
| Friday | 87°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 38% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 1 to 5 mph S | 34% |
| Saturday | 90°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph S | 34% |
| Saturday Night | 71°F | Mostly Clear | 6 mph S | 7% |
| Sunday | 92°F | Sunny | 5 to 8 mph S | 7% |
| Sunday Night | 73°F | Mostly Clear | 8 mph S | 5% |
| Monday | 94°F | Sunny | 8 mph SW | 5% |
| Monday Night | 75°F | Slight Chance Showers And Thunderstorms | 9 mph SW | 15% |
Forecast source: National Weather Service (api.weather.gov) for Cahokia Heights (38.572, -90.155). Updated through the day.
Growing snapshot for Cahokia Heights
Last spring frost
Apr 8
First fall frost
Oct 26
Growing season
200 days
Hardiness zone
7a
More local growing data for Cahokia Heights: nearby ZIP 62206 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Cahokia St Louis Ap, Il (0.7 mi from Cahokia Heights). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.