Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Current conditions at

St. Joseph, Rosecrans Memorial Airport (KSTJ)

Lat: 39.77°NLon: 94.91°WElev: 823ft.

Fair

69°F

21°C

Humidity 96%
Wind Speed NE 3 mph
Barometer 29.89 in (1011.6 mb)
Dewpoint 68°F (20°C)
Visibility 8.00 mi
Last update 19 Aug 3:53 am CDT
Extended Forecast for

Union Star MO

  • Overnight

    Overnight: A chance of showers and thunderstorms before 5am.  Mostly cloudy, with a low around 67. Calm wind.  Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, mainly after 1pm.  Partly sunny, with a high near 82. Calm wind becoming northeast around 6 mph in the morning.  Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 65. Northeast wind 3 to 6 mph.

    Low: 65 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 83. Light east wind.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 67. Light south wind.

    Low: 67 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers and thunderstorms after 1pm.  Sunny, with a high near 87. Chance of precipitation is 20%.

    High: 87 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 68. Chance of precipitation is 50%.

    Low: 68 °F

    Mostly Clear
    then Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

Detailed Forecast

Overnight
A chance of showers and thunderstorms before 5am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 82. Calm wind becoming northeast around 6 mph in the morning. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Partly cloudy, with a low around 65. Northeast wind 3 to 6 mph.
Thursday
Sunny, with a high near 83. Light east wind.
Thursday Night
Mostly clear, with a low around 67. Light south wind.
Friday
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 87. Chance of precipitation is 20%.
Friday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Chance of precipitation is 50%.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
Partly cloudy, with a low around 66.
Sunday
Partly sunny, with a high near 82.
Sunday Night
Mostly cloudy, with a low around 66.
Monday
Partly sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
Partly sunny, with a high near 87.
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ABOUT THIS FORECAST

 
Point Forecast:
Union Star MO
 39.99°N 94.6°W (Elev. 958 ft)
2:47 am CDT Aug 19, 2026
4am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

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