Willow Lake, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Willow Lake, a community in Stephenson County, Illinois.
Today
85°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Mostly sunny. High near 85, with temperatures falling to around 81 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.
7-day forecast for Willow Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 22% |
| Tonight | 64°F | Showers And Thunderstorms Likely | 5 to 10 mph NW | 87% |
| Wednesday | 75°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 5 mph NW | 80% |
| Wednesday Night | 58°F | Showers And Thunderstorms Likely | 0 to 5 mph NW | 58% |
| Thursday | 78°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 25% |
| Thursday Night | 57°F | Mostly Clear | 0 mph | 6% |
| Friday | 80°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 62°F | Mostly Clear | 5 mph S | 6% |
| Saturday | 83°F | Mostly Sunny | 5 to 10 mph SW | 11% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 23% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 23% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 42% |
| Monday | 83°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 40% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph W | 42% |
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
German Valley
Lake Summerset
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 Aug 4, 2026.