Shannon, IL Weather & Growing Conditions
This Afternoon
59°F
Slight Chance Rain Showers
A slight chance of rain showers before 5pm, then a slight chance of drizzle. Cloudy. High near 59, with temperatures falling to around 55 in the afternoon. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Slight Chance Rain Showers | 15 mph SW | 17% |
| Tonight | 46°F | Slight Chance Rain Showers | 15 mph SW | 24% |
| Thursday | 50°F | Chance Rain Showers | 10 to 15 mph W | 37% |
| Thursday Night | 36°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph N | 18% |
| Friday | 48°F | Mostly Sunny | 5 to 15 mph N | 0% |
| Friday Night | 27°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 31°F | Mostly Clear | 5 mph W | 0% |
| Sunday | 58°F | Sunny | 5 to 10 mph W | 1% |
| Sunday Night | 33°F | Clear | 0 to 5 mph W | 0% |
| Monday | 61°F | Sunny | 5 to 15 mph SW | 0% |
| Monday Night | 38°F | Clear | 5 to 10 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 mph NW | 1% |
| Tuesday Night | 37°F | Partly Cloudy | 0 to 5 mph NW | 1% |
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 Nov 5, 2026.