Waukegan, IL Weather & Growing Conditions
Today
82°F
Mostly Sunny
Mostly sunny, with a high near 82. South wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Mostly Sunny | 5 to 10 mph S | 0% |
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph SW | 43% |
| Wednesday | 78°F | Showers And Thunderstorms Likely | 5 mph SW | 74% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 5 mph NW | 82% |
| Thursday | 76°F | Rain Showers Likely | 5 mph NNE | 55% |
| Thursday Night | 63°F | Partly Cloudy | 0 to 5 mph SSE | 13% |
| Friday | 80°F | Mostly Sunny | 0 to 5 mph SSW | 3% |
| Friday Night | 66°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 81°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph SSW | 15% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 22% |
| Sunday | 81°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 22% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 47% |
| Monday | 80°F | Chance Showers And Thunderstorms | 5 mph SSW | 47% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 5 mph NNW | 49% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Waukegan, IL
Last spring frost
Apr 30
First fall frost
Oct 19
Growing season
170 days
Hardiness zone
6a
Explore more for Waukegan, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Waukegan, Il (1.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.