Marion, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marion, a city in Williamson County, Illinois.
Tonight
56°F
Showers And Thunderstorms
Showers and thunderstorms before 3am. Mostly cloudy. Low around 56, with temperatures rising to around 58 overnight. South wind 7 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
7-day forecast for Marion
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Showers And Thunderstorms | 7 to 16 mph S | 99% |
| Wednesday | 69°F | Partly Sunny | 5 to 10 mph WSW | 9% |
| Wednesday Night | 44°F | Partly Cloudy | 3 mph SW | 0% |
| Thursday | 70°F | Sunny | 2 to 9 mph SW | 0% |
| Thursday Night | 44°F | Partly Cloudy | 2 mph W | 5% |
| Friday | 62°F | Partly Sunny | 3 to 10 mph NNW | 4% |
| Friday Night | 39°F | Mostly Cloudy | 2 to 6 mph NNW | 1% |
| Saturday | 58°F | Partly Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 63°F | Sunny | 0 to 7 mph WNW | 6% |
| Sunday Night | 34°F | Mostly Clear | 3 mph NW | 5% |
| Monday | 66°F | Sunny | 1 to 8 mph W | 2% |
| Monday Night | 38°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 70°F | Sunny | 2 to 7 mph SW | 1% |
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
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Creal Springs
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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 Nov 4, 2026.