Deer Grove, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Deer Grove, a village in Whiteside County, Illinois.
Tonight
65°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1am. Mostly cloudy. Low around 65, with temperatures rising to around 67 overnight. Southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Deer Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 65°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 mph SE | 40% |
| Saturday | 82°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph S | 70% |
| Saturday Night | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph N | 80% |
| Sunday | 72°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 80% |
| Sunday Night | 56°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 67% |
| Monday | 66°F | Rain Showers Likely | 15 mph NE | 56% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 42% |
| Tuesday | 64°F | Chance Rain Showers | 10 to 15 mph NE | 35% |
| Tuesday Night | 49°F | Mostly Cloudy | 5 to 15 mph NE | 5% |
| Wednesday | 68°F | Partly Sunny | 5 to 10 mph NE | 3% |
| Wednesday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Thursday | 70°F | Mostly Sunny | 5 mph NE | 4% |
| Thursday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 72°F | Mostly Sunny | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Deer Grove (41.610, -89.687). Updated through the day.
Growing snapshot for Deer Grove
Last spring frost
Apr 24
First fall frost
Oct 14
Growing season
172 days
Hardiness zone
5b
More local growing data for Deer Grove: nearby ZIP 61243 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Walnut, Il (5.6 mi from Deer Grove). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.