Lemont, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lemont, a village in Cook County, Illinois.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. South southwest wind 5 to 10 mph.
7-day forecast for Lemont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 to 10 mph SSW | 6% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 20% |
| Wednesday | 80°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 63% |
| Wednesday Night | 65°F | Showers And Thunderstorms | 0 to 5 mph W | 89% |
| Thursday | 79°F | Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SE | 75% |
| Thursday Night | 63°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 30% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph SSW | 8% |
| Saturday | 84°F | Mostly Sunny | 5 to 10 mph SSW | 10% |
| Saturday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 17% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 17% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 10 mph SSW | 40% |
| Monday | 85°F | Chance Rain Showers | 5 to 10 mph SW | 40% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 10 mph WSW | 45% |
Forecast source: National Weather Service (api.weather.gov) for Lemont (41.667, -87.982). Updated through the day.
Growing snapshot for Lemont
Last spring frost
Apr 19
First fall frost
Oct 22
Growing season
183 days
Hardiness zone
6a
More local growing data for Lemont: nearby ZIP 60439 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Little Red School Hse, Il (5.7 mi from Lemont). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.