Downers Grove, IL Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 10 mph SSW | 1% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 23% |
| Wednesday | 81°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph SW | 68% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 5 mph W | 90% |
| Thursday | 79°F | Rain Showers Likely | 5 mph E | 72% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 26% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SSW | 5% |
| Friday Night | 66°F | Mostly Clear | 0 to 5 mph SSW | 8% |
| Saturday | 84°F | Mostly Sunny | 5 to 10 mph SSW | 10% |
| Saturday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 18% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 18% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 40% |
| Monday | 85°F | Chance Rain Showers | 5 to 10 mph SW | 40% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 10 mph SW | 45% |
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
5b
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 (4.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.