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.
This Afternoon
98°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 98. Heat index values as high as 103. East wind around 3 mph. Chance of precipitation is 30%.
7-day forecast for Cahokia Heights
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 98°F | Chance Showers And Thunderstorms | 3 mph E | 26% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 mph SE | 24% |
| Saturday | 98°F | Mostly Sunny | 3 to 8 mph SW | 6% |
| Saturday Night | 72°F | Partly Cloudy | 6 mph S | 1% |
| Sunday | 94°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph W | 18% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 mph N | 57% |
| Monday | 81°F | Showers And Thunderstorms Likely | 6 to 9 mph N | 69% |
| Monday Night | 59°F | Showers And Thunderstorms Likely | 7 to 10 mph N | 69% |
| Tuesday | 73°F | Chance Rain Showers then Mostly Cloudy | 10 mph N | 25% |
| Tuesday Night | 53°F | Mostly Cloudy | 5 to 10 mph N | 6% |
| Wednesday | 75°F | Mostly Sunny | 8 mph N | 2% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 7 mph N | 2% |
| Thursday | 76°F | Mostly Sunny | 2 to 8 mph N | 3% |
| Thursday Night | 56°F | Partly Cloudy | 3 to 7 mph NE | 3% |
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 Sep 19, 2026.