Shannon, IL Weather & Growing Conditions
Overnight
61°F
Mostly Clear
Mostly clear, with a low around 61. South wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Tuesday Night | 66°F | Showers And Thunderstorms Likely | 5 to 10 mph W | 77% |
| Wednesday | 75°F | Showers And Thunderstorms Likely | 5 mph W | 74% |
| Wednesday Night | 59°F | Showers And Thunderstorms Likely | 0 to 5 mph N | 67% |
| Thursday | 78°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 30% |
| Thursday Night | 59°F | Mostly Clear | 0 mph | 7% |
| Friday | 80°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 63°F | Mostly Clear | 0 to 5 mph S | 7% |
| Saturday | 83°F | Mostly Sunny | 5 to 10 mph SW | 11% |
| Saturday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 22% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 22% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 41% |
| Monday | 84°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 38% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Shannon, IL
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
169 days
Hardiness zone
5a
Explore more for Shannon, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Freeport Waste Wtp, Il (11.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.