Waukegan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waukegan, a city in Lake County, Illinois.
Today
74°F
Showers And Thunderstorms then Showers And Thunderstorms Likely
Showers and thunderstorms before noon, then showers and thunderstorms likely between noon and 4pm, then showers and thunderstorms likely. Some of the storms could produce heavy rain. Cloudy. High near 74, with temperatures falling to around 71 in the afternoon. South southeast wind 5 to 15 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Waukegan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 15 mph SSE | 100% |
| Tonight | 61°F | Showers And Thunderstorms | 5 to 15 mph ENE | 94% |
| Sunday | 69°F | Chance Showers And Thunderstorms | 15 to 20 mph NNE | 50% |
| Sunday Night | 55°F | Mostly Cloudy | 15 to 20 mph NE | 12% |
| Monday | 65°F | Slight Chance Rain Showers | 15 to 20 mph ENE | 19% |
| Monday Night | 52°F | Mostly Cloudy | 15 mph ENE | 10% |
| Tuesday | 63°F | Mostly Cloudy | 15 to 20 mph NE | 10% |
| Tuesday Night | 52°F | Mostly Cloudy | 5 to 15 mph NE | 8% |
| Wednesday | 64°F | Partly Sunny | 10 mph NE | 11% |
| Wednesday Night | 53°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Thursday | 66°F | Partly Sunny | 5 to 10 mph NE | 3% |
| Thursday Night | 53°F | Mostly Cloudy | 5 mph NNE | 3% |
| Friday | 68°F | Partly Sunny | 5 to 10 mph NE | 4% |
| Friday Night | 54°F | Partly Cloudy | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Waukegan (42.369, -87.871). Updated through the day.
Growing snapshot for Waukegan
Last spring frost
Apr 30
First fall frost
Oct 19
Growing season
170 days
Hardiness zone
6a
More local growing data for Waukegan: nearby ZIP 60085 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Climate data from the nearest NOAA station, Waukegan, Il (1.2 mi from Waukegan). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.