Westmont, IL Weather & Growing Conditions
Tonight
65°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. Low around 65, with temperatures rising to around 68 overnight. West southwest wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 65°F | Showers And Thunderstorms | 5 mph WSW | 100% |
| Sunday | 67°F | Showers And Thunderstorms | 10 to 15 mph NNE | 86% |
| Sunday Night | 58°F | Chance Rain Showers | 15 mph ENE | 28% |
| Monday | 64°F | Chance Rain Showers | 15 mph ENE | 40% |
| Monday Night | 55°F | Chance Rain Showers | 10 to 15 mph ENE | 27% |
| Tuesday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 27% |
| Tuesday Night | 55°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 18% |
| Wednesday | 64°F | Mostly Cloudy | 10 mph NE | 13% |
| Wednesday Night | 55°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Thursday | 67°F | Partly Sunny | 5 to 10 mph NE | 3% |
| Thursday Night | 56°F | Mostly Cloudy | 5 to 10 mph NE | 10% |
| Friday | 71°F | Partly Sunny | 5 to 10 mph NE | 10% |
| Friday Night | 56°F | Partly Cloudy | 0 to 10 mph NE | 2% |
| Saturday | 73°F | Mostly Sunny | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Westmont, IL
Last spring frost
Apr 28
First fall frost
Oct 16
Growing season
169 days
Hardiness zone
6a
Explore more for Westmont, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Lisle-Morton Arboretum, Il (5.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.