Mount Sterling, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Sterling, a city in Brown County, Illinois.
Tonight
70°F
Partly Cloudy
Partly cloudy, with a low around 70. Southeast wind around 8 mph.
7-day forecast for Mount Sterling
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Partly Cloudy | 8 mph SE | 13% |
| Saturday | 91°F | Partly Sunny | 5 to 8 mph SW | 10% |
| Saturday Night | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SW | 34% |
| Sunday | 81°F | Rain Showers Likely | 2 to 9 mph NW | 71% |
| Sunday Night | 61°F | Showers And Thunderstorms Likely | 8 to 12 mph NE | 71% |
| Monday | 67°F | Showers And Thunderstorms Likely | 12 mph NE | 71% |
| Monday Night | 55°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 44% |
| Tuesday | 65°F | Chance Rain Showers | 10 mph NE | 33% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 9 mph N | 5% |
| Wednesday | 68°F | Mostly Sunny | 5 to 8 mph N | 1% |
| Wednesday Night | 53°F | Partly Cloudy | 2 to 6 mph NE | 1% |
| Thursday | 69°F | Mostly Sunny | 6 mph NE | 5% |
| Thursday Night | 55°F | Partly Cloudy | 5 mph NE | 5% |
| Friday | 71°F | Mostly Sunny | 2 to 6 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov) for Mount Sterling (39.985, -90.764). Updated through the day.
Growing snapshot for Mount Sterling
Last spring frost
Apr 18
First fall frost
Oct 15
Growing season
179 days
Hardiness zone
6a
More local growing data for Mount Sterling: nearby ZIP 62353 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Perry 6 Nw, Il (12.1 mi from Mount Sterling). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.