St. Elmo, IL Weather & Growing Conditions
Overnight
56°F
Light Rain Likely
Rain likely. Mostly cloudy, with a low around 56. South wind 10 to 14 mph, with gusts as high as 29 mph. Chance of precipitation is 60%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Light Rain Likely | 10 to 14 mph S | 56% |
| Wednesday | 63°F | Slight Chance Light Rain then Mostly Cloudy | 7 to 13 mph SW | 24% |
| Wednesday Night | 44°F | Partly Cloudy | 6 mph SW | 1% |
| Thursday | 62°F | Mostly Sunny | 5 to 10 mph W | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 3 mph NW | 1% |
| Friday | 55°F | Partly Sunny | 5 to 10 mph NW | 2% |
| Friday Night | 35°F | Partly Cloudy | 2 to 7 mph N | 0% |
| Saturday | 54°F | Mostly Sunny | 5 mph N | 0% |
| Saturday Night | 32°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 59°F | Sunny | 1 to 6 mph NW | 1% |
| Sunday Night | 34°F | Clear | 2 mph W | 1% |
| Monday | 63°F | Sunny | 0 to 6 mph SW | 0% |
| Monday Night | 39°F | Clear | 2 mph SW | 0% |
| Tuesday | 66°F | Sunny | 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Elmo, IL
Last spring frost
Apr 3
First fall frost
Oct 24
Growing season
202 days
Hardiness zone
6b
Explore more for St. Elmo, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Brownstown 4 Sw, Il (7.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.