Shannon, IL Weather & Growing Conditions
Overnight
63°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3am, then showers and thunderstorms likely between 3am and 4am, then patchy fog and occasional showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Chance Showers And Thunderstorms | 10 mph SE | 87% |
| Saturday | 77°F | Patchy Fog | 5 to 10 mph SE | 97% |
| Saturday Night | 61°F | Showers And Thunderstorms | 5 to 10 mph NW | 90% |
| Sunday | 68°F | Rain Showers Likely | 10 to 15 mph NE | 55% |
| Sunday Night | 54°F | Chance Rain Showers | 15 to 20 mph NE | 33% |
| Monday | 63°F | Chance Rain Showers | 15 mph NE | 45% |
| Monday Night | 49°F | Slight Chance Rain Showers | 10 to 15 mph NE | 24% |
| Tuesday | 62°F | Slight Chance Rain Showers then Partly Sunny | 15 mph NE | 17% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 15 mph NE | 7% |
| Wednesday | 65°F | Mostly Sunny | 10 to 15 mph NE | 2% |
| Wednesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 67°F | Mostly Sunny | 5 mph NE | 4% |
| Thursday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 70°F | Mostly Sunny | 5 mph NE | 3% |
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 Sep 19, 2026.