Lemont, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lemont, a village in Cook County, Illinois.
This Afternoon
72°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. High near 72, with temperatures falling to around 69 in the afternoon. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Lemont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Chance Rain Showers | 15 mph S | 40% |
| Tonight | 60°F | Rain Showers | 15 mph S | 85% |
| Wednesday | 63°F | Rain Showers Likely | 15 mph SSW | 59% |
| Wednesday Night | 48°F | Mostly Cloudy | 15 mph SW | 14% |
| Thursday | 57°F | Chance Rain Showers | 10 to 15 mph WSW | 27% |
| Thursday Night | 44°F | Chance Rain Showers | 5 to 10 mph WNW | 40% |
| Friday | 53°F | Chance Rain Showers | 10 mph N | 26% |
| Friday Night | 38°F | Mostly Cloudy | 5 to 10 mph NNW | 11% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 8% |
| Saturday Night | 36°F | Partly Cloudy | 0 to 5 mph WSW | 5% |
| Sunday | 56°F | Mostly Sunny | 5 to 10 mph W | 14% |
| Sunday Night | 37°F | Mostly Clear | 5 to 10 mph WNW | 9% |
| Monday | 60°F | Sunny | 5 to 10 mph WSW | 4% |
| Monday Night | 41°F | Mostly Clear | 5 to 10 mph WSW | 2% |
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 Nov 4, 2026.