Collinsville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Collinsville, a city in Madison County, Illinois.
This Afternoon
72°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 72, with temperatures falling to around 68 in the afternoon. South wind 17 to 21 mph, with gusts as high as 32 mph. Chance of precipitation is 90%.
7-day forecast for Collinsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Rain | 17 to 21 mph S | 92% |
| Tonight | 55°F | Rain | 8 to 17 mph S | 98% |
| Wednesday | 64°F | Chance Rain Showers then Mostly Cloudy | 7 to 14 mph W | 12% |
| Wednesday Night | 46°F | Partly Cloudy | 6 mph SW | 0% |
| Thursday | 66°F | Sunny | 5 to 10 mph W | 1% |
| Thursday Night | 47°F | Mostly Cloudy | 6 mph NW | 8% |
| Friday | 58°F | Mostly Cloudy | 6 to 10 mph NW | 6% |
| Friday Night | 41°F | Partly Cloudy | 2 to 7 mph N | 1% |
| Saturday | 56°F | Mostly Sunny | 5 mph NW | 0% |
| Saturday Night | 39°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 62°F | Sunny | 1 to 7 mph W | 8% |
| Sunday Night | 39°F | Mostly Clear | 5 mph W | 5% |
| Monday | 66°F | Sunny | 2 to 7 mph SW | 2% |
| Monday Night | 43°F | Mostly Clear | 5 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Collinsville (38.676, -90.006). Updated through the day.
Growing snapshot for Collinsville
Last spring frost
Apr 8
First fall frost
Oct 26
Growing season
200 days
Hardiness zone
7a
More local growing data for Collinsville: nearby ZIP 62234 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Cahokia St Louis Ap, Il (12.2 mi from Collinsville). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.