Lemont, IL Weather & Growing Conditions
Tonight
60°F
Rain
Rain. Cloudy. Low around 60, with temperatures rising to around 62 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Rain | 15 mph S | 85% |
| Wednesday | 63°F | Rain Likely then 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% |
| Tuesday | 61°F | Mostly Sunny | 5 to 10 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lemont, IL
Last spring frost
Apr 19
First fall frost
Oct 22
Growing season
183 days
Hardiness zone
6a
Explore more for Lemont, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Little Red School Hse, Il (5.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.