Downers Grove, IL Weather & Growing Conditions
Overnight
60°F
Rain Showers
Rain showers. 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 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Rain Showers | 15 mph S | 84% |
| Wednesday | 64°F | Chance Rain Showers then Mostly Cloudy | 15 mph SSW | 32% |
| Wednesday Night | 48°F | Mostly Cloudy | 15 mph SW | 13% |
| Thursday | 56°F | Cloudy then Chance Rain Showers | 10 to 15 mph WSW | 43% |
| Thursday Night | 42°F | Chance Rain Showers | 10 mph NW | 50% |
| Friday | 50°F | Mostly Cloudy | 10 to 15 mph NNW | 12% |
| Friday Night | 36°F | Partly Cloudy | 5 to 10 mph NNW | 1% |
| Saturday | 51°F | Mostly Sunny | 5 mph NW | 0% |
| Saturday Night | 35°F | Mostly Clear | 5 mph W | 0% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 5% |
| Sunday Night | 37°F | Mostly Clear | 5 to 10 mph W | 1% |
| Monday | 60°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 to 10 mph WSW | 1% |
| Tuesday | 62°F | Sunny | 5 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Downers Grove, IL
Last spring frost
Apr 28
First fall frost
Oct 16
Growing season
169 days
Hardiness zone
6a
Explore more for Downers Grove, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Lisle-Morton Arboretum, Il (2.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.