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
85°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny, with a high near 85. Southeast wind around 2 mph.
7-day forecast for St. Elmo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Patchy Fog then Sunny | 2 mph SE | 0% |
| Tonight | 63°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 86°F | Sunny | 0 to 3 mph S | 3% |
| Wednesday Night | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 3 mph S | 43% |
| Thursday | 84°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 mph SW | 65% |
| Thursday Night | 67°F | Chance Showers And Thunderstorms | 3 mph S | 50% |
| Friday | 84°F | Chance Showers And Thunderstorms | 3 mph SW | 38% |
| Friday Night | 67°F | Slight Chance Showers And Thunderstorms | 2 mph S | 24% |
| Saturday | 86°F | Slight Chance Showers And Thunderstorms | 5 mph S | 24% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 mph S | 15% |
| Sunday | 88°F | Sunny | 5 to 9 mph SW | 8% |
| Sunday Night | 72°F | Mostly Clear | 8 mph S | 6% |
| Monday | 89°F | Mostly Sunny | 8 mph SW | 8% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 19% |
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 Aug 4, 2026.