Marion, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marion, a city in Williamson County, Illinois.
This Afternoon
100°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Sunny. High near 100, with temperatures falling to around 98 in the afternoon. Heat index values as high as 107. Southwest wind around 7 mph. Chance of precipitation is 20%.
7-day forecast for Marion
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 100°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 22% |
| Tonight | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 3 mph SSE | 22% |
| Saturday | 99°F | Sunny | 2 to 7 mph SW | 3% |
| Saturday Night | 73°F | Partly Cloudy | 5 mph SSW | 1% |
| Sunday | 98°F | Sunny | 3 to 8 mph WSW | 6% |
| Sunday Night | 70°F | Partly Cloudy | 5 mph N | 12% |
| Monday | 89°F | Partly Sunny then Chance Showers And Thunderstorms | 3 to 10 mph N | 43% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 5 to 10 mph NNE | 43% |
| Tuesday | 77°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 7 to 12 mph N | 17% |
| Tuesday Night | 58°F | Mostly Cloudy | 5 to 12 mph N | 7% |
| Wednesday | 76°F | Mostly Sunny | 6 to 10 mph N | 3% |
| Wednesday Night | 56°F | Partly Cloudy | 2 to 8 mph NNE | 2% |
| Thursday | 77°F | Mostly Sunny | 2 to 9 mph N | 2% |
| Thursday Night | 58°F | Partly Cloudy | 2 to 8 mph NNE | 2% |
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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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 18, 2026.