Waukegan, IL Weather & Growing Conditions
Tonight
61°F
Slight Chance Rain Showers then Showers And Thunderstorms Likely
A slight chance of rain showers between 11pm and midnight, then showers and thunderstorms likely. Mostly cloudy, with a low around 61. East wind 15 to 20 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Slight Chance Rain Showers then Showers And Thunderstorms Likely | 15 to 20 mph E | 71% |
| Saturday | 74°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 to 20 mph SE | 96% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 10 to 15 mph ENE | 79% |
| Sunday | 67°F | Showers And Thunderstorms Likely | 15 to 25 mph NNE | 70% |
| Sunday Night | 55°F | Chance Rain Showers | 20 mph NE | 43% |
| Monday | 66°F | Chance Rain Showers | 20 to 25 mph ENE | 40% |
| Monday Night | 54°F | Chance Rain Showers | 15 to 20 mph ENE | 33% |
| Tuesday | 62°F | Slight Chance Rain Showers | 15 mph NE | 21% |
| Tuesday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 19% |
| Wednesday | 63°F | Mostly Cloudy | 10 mph NE | 13% |
| Wednesday Night | 55°F | Mostly Cloudy | 5 to 10 mph NNE | 4% |
| Thursday | 65°F | Partly Sunny | 5 to 10 mph NNE | 6% |
| Thursday Night | 56°F | Mostly Cloudy | 5 mph NNE | 5% |
| Friday | 67°F | Mostly Sunny | 5 mph NNE | 5% |
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 Sep 19, 2026.