Marion, IL Weather & Growing Conditions
Overnight
64°F
Mostly Clear
Mostly clear. Low around 64, with temperatures rising to around 66 overnight. Wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 88°F | Patchy Fog then Sunny | 0 to 5 mph ENE | 0% |
| Tuesday Night | 64°F | Mostly Clear | 0 to 3 mph ENE | 0% |
| Wednesday | 91°F | Sunny | 0 to 3 mph SSW | 0% |
| Wednesday Night | 69°F | Mostly Clear | 2 mph S | 2% |
| Thursday | 90°F | Slight Chance Showers And Thunderstorms | 2 to 8 mph SSW | 24% |
| Thursday Night | 70°F | Slight Chance Showers And Thunderstorms | 0 to 6 mph S | 57% |
| Friday | 90°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 6 mph SW | 57% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 0 to 3 mph SSW | 37% |
| Saturday | 90°F | Chance Showers And Thunderstorms | 1 to 6 mph SSW | 36% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph S | 18% |
| Sunday | 92°F | Mostly Sunny | 3 to 9 mph SSW | 8% |
| Sunday Night | 72°F | Mostly Clear | 3 to 8 mph SSW | 5% |
| Monday | 93°F | Sunny | 3 to 10 mph SSW | 5% |
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 Aug 4, 2026.