Union Star, MO Weather & Growing Conditions
Overnight
45°F
Patchy Drizzle
Patchy drizzle before 3am. Cloudy, with a low around 45. West northwest wind around 14 mph, with gusts as high as 21 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 45°F | Patchy Drizzle | 14 mph WNW | 10% |
| Wednesday | 55°F | Mostly Cloudy | 12 to 16 mph W | 4% |
| Wednesday Night | 41°F | Partly Cloudy | 9 mph W | 1% |
| Thursday | 54°F | Partly Sunny | 8 to 12 mph NW | 9% |
| Thursday Night | 42°F | Mostly Cloudy | 8 mph NNW | 4% |
| Friday | 53°F | Partly Sunny | 5 to 8 mph N | 1% |
| Friday Night | 33°F | Partly Cloudy | 0 to 3 mph ENE | 0% |
| Saturday | 55°F | Mostly Sunny | 3 mph S | 0% |
| Saturday Night | 36°F | Mostly Clear | 2 mph WSW | 0% |
| Sunday | 61°F | Sunny | 2 to 6 mph W | 0% |
| Sunday Night | 39°F | Clear | 5 mph SW | 0% |
| Monday | 67°F | Sunny | 5 to 9 mph SSW | 0% |
| Monday Night | 42°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 67°F | Sunny | 6 mph N | 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 (10.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.