Marcellus Weather Forecast

    • 47
    • 73

    Partly Sunny

    • 51
    • 79

    Rain Showers

    • 43
    • 67

    Rain Showers

    • 41
    • 63

    Partly Sunny

    • 41
    • 65

    Mostly Cloudy

    • 43
    • 66

    Partly Sunny

Today 23 Sep Upper Columbia Basin

Mostly cloudy in the Morning, becoming partly cloudy. Highs in the lower to mid 70s. South wind 5 to 10 Mph.

Tonight 23 Sep Upper Columbia Basin

Partly cloudy. Lows in the mid 40s to lower 50s. Light Wind, becoming northeast 5 to 10 Mph overnight.

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Marcellus Temperature Statistics

September Temperature

Grant County Airport (42.3 miles)

  • Lowest 14 September, 2026

    41.6 °F

  • Average September

    62.8 °F

  • Highest 20 September, 2026

    84.7 °F

Climate (2021–2026)

Grant County Airport (42.3 miles)

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  • Average Low 2021–2026

    40.8 °F

  • Average 2021–2026

    52.5 °F

  • Average High 2021–2026

    64.2 °F
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