Union Weather Forecast

    • 64
    • 86

    Partly Sunny

    • 61
    • 87

    Mostly Sunny

    • 63
    • 88

    Sunny

    • 67
    • 91

    Mostly Sunny

    • 67
    • 89

    Partly Sunny

    • 68
    • 89

    Slight Chance Thunderstorms

Today 15 Sep Union

Partly sunny. A slight chance of Showers this morning. Highs in the mid 80s. East Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 15 Sep Union

Partly cloudy. Lows in the mid 60s. Northeast Winds around 5 Mph in the Evening, becoming light and variable.

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Union Temperature Statistics

September Temperature

Spartanburg Memorial (23 miles)

  • Lowest 9 September, 2026

    62.6 °F

  • Average September

    78.3 °F

  • Highest 2 September, 2026

    96.8 °F

Climate (2021–2026)

Spartanburg Memorial (23 miles)

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  • Average Low 2021–2026

    51.3 °F

  • Average 2021–2026

    61.1 °F

  • Average High 2021–2026

    72 °F
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