Union Star Weather Forecast

    • 26
    • 46

    Decreasing Clouds

    • 32
    • 44

    Partly Sunny

    • 39
    • 54

    Partly Sunny

    • 42
    • 57

    Mostly Cloudy

    • 48
    • 62

    Partly Sunny

    • 42
    • 66

    Partly Sunny

Today 20 Dec De Kalb

Mostly sunny. Highs in the upper 40s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 20 Dec De Kalb

Partly cloudy. Lows in the mid 20s. Northwest Winds around 5 Mph.

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Union Star Temperature Statistics

December Temperature

St. Joseph, Rosecrans Memorial Airport (21.7 miles)

  • Lowest 14 December, 2025

    3 °F

  • Average December

    29.7 °F

  • Highest 9 December, 2025

    55.9 °F

Climate (2020–Present)

St. Joseph, Rosecrans Memorial Airport (21.7 miles)

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  • Average Low 2020–2025

    43.8 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    66.7 °F
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