Mundelein, IL Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. Southwest wind around 10 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 10 mph SW | 0% |
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph SW | 44% |
| Wednesday | 78°F | Showers And Thunderstorms Likely | 5 mph WSW | 74% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 0 to 5 mph NW | 82% |
| Thursday | 78°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph NNE | 54% |
| Thursday Night | 60°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph S | 15% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SSW | 3% |
| Friday Night | 63°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 84°F | Mostly Sunny | 5 mph SW | 12% |
| Saturday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SW | 21% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 21% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 46% |
| Monday | 84°F | Chance Showers And Thunderstorms | 5 mph SSW | 46% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 mph W | 47% |
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 Aug 4, 2026.