Union Weather Forecast

    • 65
    • 85

    Rain Showers

    • 58
    • 69

    Rain Showers Likely

    • 54
    • 69

    Mostly Cloudy

    • 53
    • 74

    Mostly Sunny

    • 52
    • 76

    Mostly Sunny

    • 53
    • 77

    Mostly Sunny

Today 22 Sep Union

Partly sunny with a chance of Showers and Thunderstorms. Highs in the mid 80s. Northeast Winds around 5 Mph. Chance of rain 50 percent.

Tonight 22 Sep Union

Mostly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Lows in the mid 60s. Northeast Winds around 5 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Union Temperature Statistics

September Temperature

Spartanburg Memorial (23 miles)

  • Lowest 9 September, 2026

    62.6 °F

  • Average September

    77.7 °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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