Millbrook, IL Weather & Growing Conditions
Overnight
58°F
Rain Showers
Rain showers. Cloudy. Low around 58, with temperatures rising to around 61 overnight. South wind around 15 mph, with gusts as high as 25 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 | 58°F | Rain Showers | 15 mph S | 82% |
| Wednesday | 62°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SSW | 19% |
| Wednesday Night | 47°F | Mostly Cloudy | 15 mph SW | 10% |
| Thursday | 56°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph WSW | 39% |
| Thursday Night | 42°F | Chance Rain Showers | 10 mph NW | 44% |
| Friday | 51°F | Partly Sunny | 10 to 15 mph NNW | 11% |
| Friday Night | 33°F | Partly Cloudy | 5 to 10 mph NNW | 0% |
| Saturday | 52°F | Sunny | 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 4% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 61°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 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 Millbrook, IL
Last spring frost
Apr 28
First fall frost
Oct 13
Growing season
166 days
Explore more for Millbrook, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Chicago Aurora Muni Ap, Il (12.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.