Union Star, MO Weather & Growing Conditions
Today
88°F
Mostly Sunny
Mostly sunny, with a high near 88. South wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Mostly Sunny | 6 mph S | 14% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 5 to 9 mph ENE | 43% |
| Wednesday | 79°F | Showers And Thunderstorms Likely | 10 mph NE | 61% |
| Wednesday Night | 63°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 59% |
| Thursday | 82°F | Showers And Thunderstorms Likely then Mostly Sunny | 6 mph ENE | 59% |
| Thursday Night | 65°F | Mostly Clear | 5 mph SE | 13% |
| Friday | 86°F | Mostly Sunny | 3 to 8 mph S | 13% |
| Friday Night | 69°F | Mostly Clear | 7 mph SSE | 14% |
| Saturday | 90°F | Sunny | 6 to 13 mph S | 5% |
| Saturday Night | 74°F | Mostly Clear | 12 to 15 mph S | 6% |
| Sunday | 92°F | Sunny | 15 mph SSW | 4% |
| Sunday Night | 75°F | Partly Cloudy | 13 to 16 mph S | 5% |
| Monday | 93°F | Mostly Sunny | 17 mph SSW | 5% |
| Monday Night | 75°F | Partly Cloudy | 15 mph SSW | 11% |
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 Aug 4, 2026.