Shannon, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Shannon, a village in Carroll County, Illinois.
This Afternoon
70°F
Slight Chance Rain Showers
A slight chance of rain showers. Mostly sunny, with a high near 70. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
7-day forecast for Shannon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Slight Chance Rain Showers | 10 mph E | 18% |
| Tonight | 63°F | Chance Showers And Thunderstorms | 10 to 15 mph E | 68% |
| Saturday | 78°F | Showers And Thunderstorms | 5 to 10 mph S | 89% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 73% |
| Sunday | 68°F | Rain Showers Likely | 15 mph NE | 73% |
| Sunday Night | 54°F | Chance Rain Showers | 15 to 20 mph NE | 52% |
| Monday | 64°F | Chance Rain Showers | 15 to 20 mph NE | 44% |
| Monday Night | 50°F | Chance Rain Showers | 15 to 20 mph NE | 44% |
| Tuesday | 62°F | Chance Rain Showers | 15 mph NE | 27% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 15 mph NE | 8% |
| Wednesday | 66°F | Mostly Sunny | 10 mph NE | 3% |
| Wednesday Night | 50°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Thursday | 67°F | Mostly Sunny | 5 mph NE | 4% |
| Thursday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov) for Shannon (42.152, -89.740). Updated through the day.
Growing snapshot for Shannon
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
169 days
Hardiness zone
5a
More local growing data for Shannon: nearby ZIP 61078 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Freeport Waste Wtp, Il (11.1 mi from Shannon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.