Sterling, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sterling, a city in Whiteside County, Illinois.
Overnight
61°F
Mostly Clear
Mostly clear, with a low around 61. South wind around 5 mph.
7-day forecast for Sterling
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 87°F | Mostly Sunny | 5 to 10 mph SW | 7% |
| Tuesday Night | 67°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 71% |
| Wednesday | 78°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 74% |
| Wednesday Night | 62°F | Showers And Thunderstorms | 0 to 5 mph N | 79% |
| Thursday | 79°F | Chance Rain Showers | 0 to 5 mph NE | 43% |
| Thursday Night | 60°F | Mostly Clear | 0 mph | 13% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 64°F | Mostly Clear | 0 mph | 8% |
| Saturday | 85°F | Sunny | 0 to 10 mph SW | 9% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 mph S | 19% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph SW | 19% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 36% |
| Monday | 86°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 36% |
Forecast source: National Weather Service (api.weather.gov) for Sterling (41.800, -89.696). Updated through the day.
Growing snapshot for Sterling
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
167 days
Hardiness zone
5b
More local growing data for Sterling: nearby ZIP 61037 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Morrison, Il (10.7 mi from Sterling). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.