Marion, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marion, a city in Williamson County, Illinois.
Overnight
64°F
Mostly Clear
Mostly clear, with a low around 64. North wind around 1 mph.
7-day forecast for Marion
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Mostly Clear | 1 mph N | 0% |
| Tuesday | 89°F | Patchy Fog then Sunny | 0 to 5 mph ENE | 0% |
| Tuesday Night | 64°F | Mostly Clear | 0 to 3 mph E | 0% |
| Wednesday | 91°F | Sunny | 0 to 3 mph SSW | 0% |
| Wednesday Night | 69°F | Mostly Clear | 2 mph S | 3% |
| Thursday | 91°F | Chance Showers And Thunderstorms | 2 to 8 mph SSW | 25% |
| Thursday Night | 71°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph S | 58% |
| Friday | 90°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 6 mph SW | 58% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 3 mph SSW | 37% |
| Saturday | 90°F | Chance Showers And Thunderstorms | 2 to 6 mph SSW | 37% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph S | 17% |
| Sunday | 92°F | Mostly Sunny | 3 to 9 mph SSW | 8% |
| Sunday Night | 73°F | Mostly Clear | 3 to 9 mph SSW | 5% |
| Monday | 94°F | Sunny | 5 to 10 mph SSW | 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
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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 Aug 4, 2026.