Lyndon, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lyndon, a village in Whiteside County, Illinois.
This Afternoon
73°F
Mostly Sunny
Mostly sunny, with a high near 73. East wind around 10 mph.
7-day forecast for Lyndon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Sunny | 10 mph E | 11% |
| Tonight | 64°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 mph E | 57% |
| Saturday | 81°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph S | 75% |
| Saturday Night | 63°F | Showers And Thunderstorms | 5 to 10 mph NW | 79% |
| Sunday | 71°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 79% |
| Sunday Night | 55°F | Showers And Thunderstorms Likely | 15 mph NE | 64% |
| Monday | 66°F | Rain Showers Likely | 15 mph NE | 55% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 45% |
| Tuesday | 63°F | Chance Rain Showers | 15 mph NE | 32% |
| Tuesday Night | 48°F | Mostly Cloudy | 5 to 15 mph NE | 6% |
| Wednesday | 68°F | Mostly Sunny | 5 to 10 mph NE | 3% |
| Wednesday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Thursday | 69°F | Mostly Sunny | 5 mph NE | 4% |
| Thursday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Lyndon (41.718, -89.924). Updated through the day.
Growing snapshot for Lyndon
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
167 days
Hardiness zone
5b
More local growing data for Lyndon: nearby ZIP 61261 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Morrison, Il (5 mi from Lyndon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.