Willow Lake, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Willow Lake, a community in Stephenson County, Illinois.
Tonight
61°F
Chance Showers And Thunderstorms
A slight chance of rain showers before 7pm, then a chance of showers and thunderstorms between 10pm and 3am, then showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy. Low around 61, with temperatures rising to around 63 overnight. East wind 10 to 15 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Willow Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Chance Showers And Thunderstorms | 10 to 15 mph E | 79% |
| Saturday | 77°F | Showers And Thunderstorms | 5 to 10 mph S | 89% |
| Saturday Night | 60°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 74% |
| Sunday | 67°F | Rain Showers Likely | 10 to 15 mph NE | 61% |
| Sunday Night | 52°F | Chance Rain Showers | 15 mph NE | 45% |
| Monday | 64°F | Chance Rain Showers | 15 mph NE | 43% |
| Monday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 43% |
| Tuesday | 62°F | Chance Rain Showers | 15 mph NE | 28% |
| Tuesday Night | 46°F | Mostly Cloudy | 5 to 15 mph NE | 9% |
| Wednesday | 66°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Wednesday Night | 48°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Thursday | 67°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 49°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Willow Lake (42.334, -89.635). Updated through the day.
Growing snapshot for Willow Lake
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
169 days
Hardiness zone
5a
More local growing data for Willow Lake: nearby ZIP 61032 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Adeline
Cedarville
Dakota
Davis
Freeport
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Lena
Orangeville
Pearl City
Ridott
Rock City
Winslow
Climate data from the nearest NOAA station, Freeport Waste Wtp, Il (2.3 mi from Willow Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.