Union Star, MO Weather & Growing Conditions
This Afternoon
88°F
Sunny
Sunny, with a high near 88. South southwest wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 88°F | Sunny | 10 mph SSW | 10% |
| Tonight | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 8 mph NW | 68% |
| Sunday | 74°F | Chance Showers And Thunderstorms | 6 to 9 mph NNE | 33% |
| Sunday Night | 60°F | Showers And Thunderstorms Likely | 7 to 12 mph NNE | 51% |
| Monday | 65°F | Rain Showers Likely | 12 mph NNE | 51% |
| Monday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 8 to 12 mph NNE | 19% |
| Tuesday | 63°F | Partly Sunny | 10 mph NNE | 7% |
| Tuesday Night | 49°F | Partly Cloudy | 3 to 8 mph NE | 4% |
| Wednesday | 65°F | Mostly Sunny | 6 mph ENE | 0% |
| Wednesday Night | 52°F | Partly Cloudy | 5 mph E | 7% |
| Thursday | 71°F | Slight Chance Rain Showers | 6 mph SE | 24% |
| Thursday Night | 58°F | Chance Rain Showers | 5 mph ESE | 32% |
| Friday | 74°F | Chance Rain Showers | 3 to 7 mph E | 33% |
| Friday Night | 60°F | Slight Chance Rain Showers | 6 mph E | 20% |
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 Sep 19, 2026.