St. Elmo, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Elmo, a city in Fayette County, Illinois.
Today
95°F
Mostly Sunny
Mostly sunny, with a high near 95. Southwest wind 3 to 7 mph.
7-day forecast for St. Elmo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 95°F | Mostly Sunny | 3 to 7 mph SW | 13% |
| Tonight | 71°F | Partly Cloudy | 5 mph SW | 5% |
| Sunday | 91°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph NW | 33% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms | 6 to 9 mph NE | 53% |
| Monday | 76°F | Showers And Thunderstorms Likely | 8 to 12 mph NE | 70% |
| Monday Night | 56°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 7 to 13 mph NE | 70% |
| Tuesday | 70°F | Slight Chance Showers And Thunderstorms | 12 mph NE | 23% |
| Tuesday Night | 53°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 12 mph N | 17% |
| Wednesday | 73°F | Mostly Sunny | 6 to 9 mph N | 5% |
| Wednesday Night | 53°F | Partly Cloudy | 2 to 9 mph N | 3% |
| Thursday | 74°F | Mostly Sunny | 5 to 8 mph N | 2% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 7 mph NE | 2% |
| Friday | 76°F | Mostly Sunny | 3 to 8 mph NE | 2% |
| Friday Night | 54°F | Partly Cloudy | 3 to 7 mph NE | 1% |
Forecast source: National Weather Service (api.weather.gov) for St. Elmo (39.022, -88.851). Updated through the day.
Growing snapshot for St. Elmo
Last spring frost
Apr 3
First fall frost
Oct 24
Growing season
202 days
Hardiness zone
6b
More local growing data for St. Elmo: nearby ZIP 62458 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Brownstown 4 Sw, Il (7.4 mi from St. Elmo). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.