Lyndon, IL Weather & Growing Conditions
This Afternoon
68°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 68, with temperatures falling to around 66 in the afternoon. South wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Showers And Thunderstorms | 15 to 20 mph S | 97% |
| Tonight | 52°F | Showers And Thunderstorms | 15 mph S | 77% |
| Wednesday | 57°F | Chance Rain Showers then Mostly Cloudy | 15 mph SW | 31% |
| Wednesday Night | 45°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph SW | 19% |
| Thursday | 54°F | Chance Rain Showers | 10 to 15 mph W | 48% |
| Thursday Night | 41°F | Chance Rain Showers | 5 to 10 mph NW | 27% |
| Friday | 52°F | Partly Sunny | 5 to 10 mph N | 14% |
| Friday Night | 33°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 4% |
| Sunday | 59°F | Mostly Sunny | 5 to 10 mph W | 11% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 3% |
| Monday | 63°F | Sunny | 5 to 10 mph SW | 2% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lyndon, IL
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
167 days
Hardiness zone
5b
Explore more for Lyndon, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Morrison, Il (5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.