Harman US

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

WhenTempForecastWindPrecip
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.