Marion, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marion, a city in Williamson County, Illinois.
Overnight
72°F
Mostly Clear
Mostly clear. Low around 72, with temperatures rising to around 74 overnight. South southeast wind around 1 mph.
7-day forecast for Marion
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 72°F | Mostly Clear | 1 mph SSE | 1% |
| Saturday | 99°F | Sunny | 2 to 8 mph SW | 2% |
| Saturday Night | 73°F | Mostly Clear | 5 mph SSW | 1% |
| Sunday | 97°F | Mostly Sunny | 3 to 7 mph WSW | 0% |
| Sunday Night | 69°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph N | 25% |
| Monday | 86°F | Showers And Thunderstorms Likely | 5 to 10 mph NNE | 59% |
| Monday Night | 61°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 to 10 mph NNE | 59% |
| Tuesday | 76°F | Chance Showers And Thunderstorms | 7 to 12 mph N | 27% |
| Tuesday Night | 56°F | Partly Cloudy | 3 to 12 mph N | 14% |
| Wednesday | 76°F | Mostly Sunny | 6 to 10 mph N | 1% |
| Wednesday Night | 56°F | Partly Cloudy | 2 to 10 mph N | 1% |
| Thursday | 77°F | Mostly Sunny | 3 to 9 mph N | 3% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 7 mph NNE | 5% |
| Friday | 78°F | Mostly Sunny | 2 to 10 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Marion (37.734, -88.941). Updated through the day.
Growing snapshot for Marion
Last spring frost
Apr 9
First fall frost
Oct 22
Growing season
195 days
Hardiness zone
7a
More local growing data for Marion: nearby ZIP 62959 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Blairsville
Bush
Cambria
Carterville
Colp
Crab Orchard
Crainville
Creal Springs
Energy
Freeman Spur
Herrin
Hurst
Johnston City
Pittsburg
Spillertown
Whiteash
Climate data from the nearest NOAA station, Carbondale Sewage Plt, Il (13.8 mi from Marion). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.