Union Star Weather Forecast

    • 60
    • 76

    Thunderstorms Likely

    • 59
    • 77

    Partly Sunny

    • 62
    • 77

    Rain Showers Likely

    • 62
    • 77

    Chance Thunderstorms

    • 58
    • 80

    Chance Thunderstorms

    • 54
    • 74

    Chance Rain Showers

Today 18 Sep De Kalb

Partly sunny late this Morning, then becoming mostly cloudy. A chance of Showers with a slight chance of Thunderstorms late this Morning, then Showers likely with a chance of Thunderstorms this afternoon. Not as warm with Highs in the mid 70s. South Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 18 Sep De Kalb

Mostly cloudy. A chance of Showers and Thunderstorms Early, then a slight chance of Showers and Thunderstorms after midnight. Lows around 60. Southwest Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Union Star Temperature Statistics

September Temperature

St. Joseph, Rosecrans Memorial Airport (21.7 miles)

  • Lowest 4 September, 2025

    44.1 °F

  • Average September

    68.7 °F

  • Highest 12 September, 2025

    93.9 °F

Climate (2020–Present)

St. Joseph, Rosecrans Memorial Airport (21.7 miles)

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  • Average Low 2020–2025

    43.6 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    66.7 °F
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