Union Star, MO Weather & Growing Conditions
This Afternoon
55°F
Mostly Cloudy
Mostly cloudy, with a high near 55. West wind 10 to 14 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 55°F | Mostly Cloudy | 10 to 14 mph W | 5% |
| Tonight | 41°F | Partly Cloudy | 9 mph W | 4% |
| Thursday | 54°F | Slight Chance Light Rain then Mostly Cloudy | 9 to 13 mph NW | 19% |
| Thursday Night | 40°F | Mostly Cloudy | 6 to 9 mph NNW | 3% |
| Friday | 50°F | Partly Sunny | 5 to 8 mph N | 4% |
| Friday Night | 32°F | Mostly Cloudy | 0 to 3 mph NNE | 0% |
| Saturday | 54°F | Mostly Sunny | 0 to 5 mph SSW | 0% |
| Saturday Night | 34°F | Mostly Clear | 3 mph SW | 0% |
| Sunday | 62°F | Sunny | 5 mph WSW | 0% |
| Sunday Night | 38°F | Clear | 5 mph SSW | 0% |
| Monday | 67°F | Sunny | 5 to 10 mph SSW | 1% |
| Monday Night | 42°F | Clear | 3 to 7 mph SW | 0% |
| Tuesday | 66°F | Sunny | 6 mph NNW | 3% |
| Tuesday Night | 44°F | Mostly Clear | 3 mph ENE | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Union Star, MO
Last spring frost
Apr 17
First fall frost
Oct 19
Growing season
184 days
Hardiness zone
6a
Explore more for Union Star, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, Cosby 2W, Mo (6.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.