Mundelein, IL Weather & Growing Conditions
This Afternoon
76°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then showers and thunderstorms likely. Cloudy. High near 76, with temperatures falling to around 72 in the afternoon. South wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between three quarters and one inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Showers And Thunderstorms Likely | 5 to 10 mph S | 64% |
| Tonight | 62°F | Showers And Thunderstorms | 5 to 10 mph ENE | 95% |
| Sunday | 68°F | Showers And Thunderstorms Likely | 10 to 15 mph NNE | 55% |
| Sunday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph NE | 15% |
| Monday | 63°F | Slight Chance Rain Showers | 15 mph ENE | 22% |
| Monday Night | 52°F | Mostly Cloudy | 10 to 15 mph ENE | 13% |
| Tuesday | 62°F | Mostly Cloudy | 10 to 15 mph NE | 11% |
| Tuesday Night | 52°F | Mostly Cloudy | 5 to 15 mph NE | 6% |
| Wednesday | 63°F | Partly Sunny | 5 to 10 mph NE | 13% |
| Wednesday Night | 52°F | Mostly Cloudy | 5 to 10 mph NE | 5% |
| Thursday | 66°F | Partly Sunny | 5 to 10 mph NNE | 4% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 5 mph NNE | 4% |
| Friday | 69°F | Partly Sunny | 5 to 10 mph NE | 5% |
| Friday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mundelein, IL
Last spring frost
Apr 29
First fall frost
Oct 20
Growing season
172 days
Hardiness zone
5b
Explore more for Mundelein, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mundelein 4 Wsw, Il (2.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.