Union Star, MO Weather & Growing Conditions
Today
87°F
Slight Chance Rain Showers then Mostly Sunny
A slight chance of rain showers before noon. Mostly sunny, with a high near 87. Heat index values as high as 95. Southwest wind 7 to 12 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Slight Chance Rain Showers then Mostly Sunny | 7 to 12 mph SW | 15% |
| Tonight | 66°F | Showers And Thunderstorms Likely | 7 mph NW | 66% |
| Sunday | 73°F | Chance Showers And Thunderstorms | 5 to 12 mph NNE | 31% |
| Sunday Night | 60°F | Showers And Thunderstorms Likely | 8 to 12 mph NE | 59% |
| Monday | 64°F | Rain Showers Likely | 13 mph NE | 59% |
| Monday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 13 mph NNE | 19% |
| Tuesday | 62°F | Partly Sunny | 10 mph NE | 6% |
| Tuesday Night | 48°F | Partly Cloudy | 3 to 8 mph ENE | 5% |
| Wednesday | 65°F | Mostly Sunny | 6 mph ENE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 5 mph E | 8% |
| Thursday | 68°F | Slight Chance Rain Showers | 6 mph ESE | 21% |
| Thursday Night | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph E | 24% |
| Friday | 69°F | Chance Rain Showers | 7 mph E | 27% |
| Friday Night | 58°F | Mostly Cloudy | 6 mph ESE | 12% |
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 (10.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.