Stillman Valley, IL Weather & Growing Conditions
This Afternoon
72°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 72. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Slight Chance Rain Showers | 10 mph E | 20% |
| Tonight | 61°F | Slight Chance Rain Showers then Showers And Thunderstorms Likely | 10 mph E | 59% |
| Saturday | 77°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph SE | 91% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph N | 77% |
| Sunday | 67°F | Showers And Thunderstorms | 10 to 15 mph NE | 75% |
| Sunday Night | 52°F | Rain Showers Likely | 15 mph NE | 56% |
| Monday | 64°F | Chance Rain Showers | 15 mph ENE | 43% |
| Monday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 40% |
| Tuesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Tuesday Night | 46°F | Mostly Cloudy | 5 to 10 mph NE | 9% |
| Wednesday | 66°F | Partly Sunny | 5 to 10 mph NE | 4% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 10 mph NNE | 3% |
| Thursday | 68°F | Partly Sunny | 0 to 5 mph NNE | 4% |
| Thursday Night | 49°F | Partly Cloudy | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Stillman Valley, IL
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
174 days
Hardiness zone
5b
Explore more for Stillman Valley, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Rockford Gtr Rockford Ap, Il (6.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.