Lyndon, IL Weather & Growing Conditions
Overnight
64°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms. Mostly cloudy. Low around 64, with temperatures rising to around 67 overnight. Southeast wind 5 to 10 mph. Chance of precipitation is 50%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Patchy Fog | 5 to 10 mph SE | 47% |
| Saturday | 81°F | Patchy Fog | 5 to 10 mph SE | 91% |
| Saturday Night | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph NW | 89% |
| Sunday | 70°F | Rain Showers Likely | 10 to 15 mph NE | 71% |
| Sunday Night | 56°F | Chance Rain Showers | 15 mph NE | 40% |
| Monday | 65°F | Chance Rain Showers | 15 mph NE | 51% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 39% |
| Tuesday | 64°F | Slight Chance Rain Showers then Partly Sunny | 15 mph NE | 17% |
| Tuesday Night | 48°F | Partly Cloudy | 5 to 15 mph NE | 8% |
| Wednesday | 67°F | Mostly Sunny | 10 mph NE | 1% |
| Wednesday Night | 50°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 69°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 72°F | Mostly Sunny | 5 mph NE | 4% |
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 Sep 19, 2026.