Harman US

Union Star, MO Weather & Growing Conditions

Overnight
72°F
Mostly Cloudy
Mostly cloudy, with a low around 72. South southwest wind around 9 mph.

7-day forecast

WhenTempForecastWindPrecip
Overnight 72°F Mostly Cloudy 9 mph SSW 4%
Saturday 87°F Slight Chance Rain Showers then Partly Sunny 7 to 12 mph SSW 22%
Saturday Night 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%

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.