Junction City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Junction City, a village in Marion County, Illinois.
Tonight
71°F
Partly Cloudy
Partly cloudy, with a low around 71. Southeast wind around 7 mph.
7-day forecast for Junction City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 71°F | Partly Cloudy | 7 mph SE | 13% |
| Saturday | 97°F | Sunny | 5 mph SW | 6% |
| Saturday Night | 72°F | Partly Cloudy | 3 mph S | 1% |
| Sunday | 94°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 5 mph W | 17% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph NE | 43% |
| Monday | 82°F | Showers And Thunderstorms Likely | 3 to 9 mph N | 56% |
| Monday Night | 59°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 to 10 mph NE | 56% |
| Tuesday | 73°F | Chance Showers And Thunderstorms then Partly Sunny | 7 to 12 mph N | 27% |
| Tuesday Night | 55°F | Mostly Cloudy | 3 to 12 mph N | 6% |
| Wednesday | 75°F | Mostly Sunny | 5 to 9 mph N | 3% |
| Wednesday Night | 55°F | Partly Cloudy | 1 to 8 mph N | 3% |
| Thursday | 76°F | Mostly Sunny | 2 to 7 mph N | 2% |
| Thursday Night | 57°F | Partly Cloudy | 1 to 6 mph NE | 2% |
| Friday | 77°F | Mostly Sunny | 2 to 7 mph N | 3% |
Forecast source: National Weather Service (api.weather.gov) for Junction City (38.575, -89.127). Updated through the day.
Growing snapshot for Junction City
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
197 days
Hardiness zone
6b
More local growing data for Junction City: nearby ZIP 62882 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Salem, Il (9.3 mi from Junction City). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.