Downers Grove, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Downers Grove, a village in Dupage County, Illinois.
Overnight
64°F
Mostly Clear
Mostly clear. Low around 64, with temperatures rising to around 66 overnight. South wind around 5 mph.
7-day forecast for Downers Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 85°F | Mostly Sunny | 5 to 10 mph SSW | 4% |
| Tuesday Night | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SSW | 25% |
| Wednesday | 80°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph WSW | 70% |
| Wednesday Night | 65°F | Showers And Thunderstorms | 5 mph W | 89% |
| Thursday | 79°F | Rain Showers Likely | 0 to 5 mph ENE | 70% |
| Thursday Night | 63°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 25% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SSW | 5% |
| Friday Night | 65°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 | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 41% |
| Monday | 85°F | Chance Rain Showers | 5 to 10 mph SW | 41% |
Forecast source: National Weather Service (api.weather.gov) for Downers Grove (41.795, -88.021). Updated through the day.
Growing snapshot for Downers Grove
Last spring frost
Apr 28
First fall frost
Oct 16
Growing season
169 days
Hardiness zone
6a
More local growing data for Downers Grove: nearby ZIP 60515 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Climate data from the nearest NOAA station, Lisle-Morton Arboretum, Il (2.5 mi from Downers Grove). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.