Lemont, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lemont, a village in Cook County, Illinois.
This Afternoon
73°F
Chance Rain Showers
A chance of rain showers. Partly sunny. High near 73, with temperatures falling to around 70 in the afternoon. East wind 10 to 15 mph. Chance of precipitation is 50%.
7-day forecast for Lemont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Chance Rain Showers | 10 to 15 mph E | 53% |
| Tonight | 63°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 10 mph E | 43% |
| Saturday | 78°F | Showers And Thunderstorms Likely | 5 to 10 mph SE | 81% |
| Saturday Night | 66°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NNE | 82% |
| Sunday | 69°F | Showers And Thunderstorms | 10 to 15 mph NNE | 82% |
| Sunday Night | 56°F | Rain Showers Likely | 15 mph NE | 65% |
| Monday | 64°F | Rain Showers Likely | 15 mph ENE | 56% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 15 mph ENE | 33% |
| Tuesday | 63°F | Slight Chance Rain Showers | 15 mph NE | 22% |
| Tuesday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 15 mph NE | 15% |
| Wednesday | 65°F | Partly Sunny | 10 mph NNE | 8% |
| Wednesday Night | 53°F | Mostly Cloudy | 5 to 10 mph NNE | 4% |
| Thursday | 68°F | Partly Sunny | 5 to 10 mph NNE | 6% |
| Thursday Night | 54°F | Mostly Cloudy | 5 mph NNE | 3% |
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 Sep 18, 2026.