Marion, IL Weather & Growing Conditions
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 95 in the afternoon. South southwest wind around 3 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 100°F | Slight Chance Showers And Thunderstorms | 3 mph SSW | 22% |
| Tonight | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 3 mph SSE | 21% |
| Saturday | 99°F | Sunny | 2 to 7 mph SW | 3% |
| Saturday Night | 73°F | Partly Cloudy | 3 mph SSW | 1% |
| Sunday | 97°F | Sunny | 3 to 8 mph WSW | 6% |
| Sunday Night | 70°F | Partly Cloudy | 5 mph N | 11% |
| Monday | 89°F | Partly Sunny then Chance Showers And Thunderstorms | 3 to 9 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 | 57°F | Partly Cloudy | 3 to 12 mph N | 8% |
| Wednesday | 76°F | Mostly Sunny | 6 to 9 mph N | 3% |
| Wednesday Night | 56°F | Partly Cloudy | 2 to 8 mph NNE | 3% |
| Thursday | 77°F | Mostly Sunny | 2 to 9 mph N | 2% |
| Thursday Night | 58°F | Partly Cloudy | 2 to 7 mph NNE | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Marion, IL
Last spring frost
Apr 9
First fall frost
Oct 22
Growing season
195 days
Hardiness zone
7a
Explore more for Marion, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Carbondale Sewage Plt, Il (13.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.