Junction City, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Junction City, a village in Madison County, Missouri.
Tonight
70°F
Slight Chance Showers And Thunderstorms then Mostly Clear
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 70. Heat index values as high as 102. South wind 0 to 3 mph. Chance of precipitation is 20%.
7-day forecast for Junction City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 3 mph S | 18% |
| Saturday | 97°F | Mostly Sunny | 1 to 7 mph SW | 3% |
| Saturday Night | 70°F | Partly Cloudy | 5 mph SW | 0% |
| Sunday | 95°F | Sunny | 2 to 6 mph W | 5% |
| Sunday Night | 67°F | Mostly Cloudy then Chance Showers And Thunderstorms | 1 to 5 mph N | 33% |
| Monday | 85°F | Showers And Thunderstorms Likely | 2 to 6 mph N | 59% |
| Monday Night | 60°F | Showers And Thunderstorms Likely | 7 mph N | 59% |
| Tuesday | 75°F | Slight Chance Rain Showers then Partly Sunny | 7 to 10 mph N | 15% |
| Tuesday Night | 54°F | Partly Cloudy | 3 to 10 mph N | 10% |
| Wednesday | 75°F | Mostly Sunny | 8 mph N | 3% |
| Wednesday Night | 53°F | Partly Cloudy | 1 to 6 mph N | 2% |
| Thursday | 77°F | Mostly Sunny | 1 to 7 mph N | 3% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 6 mph N | 4% |
| Friday | 76°F | Mostly Sunny | 2 to 7 mph N | 9% |
Forecast source: National Weather Service (api.weather.gov) for Junction City (37.574, -90.293). Updated through the day.
Growing snapshot for Junction City
Last spring frost
Apr 21
First fall frost
Oct 16
Growing season
174 days
Hardiness zone
6b
More local growing data for Junction City: nearby ZIP 63645 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Fredericktown, Mo (2.4 mi from Junction City). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.