Greenbrier Weather Forecast

    • 55
    • 83

    Becoming Sunny

    • 50
    • 83

    Mostly Sunny

    • 53
    • 76

    Partly Sunny

    • 56
    • 73

    Mostly Cloudy

    • 58
    • 79

    Partly Sunny

    • 59
    • 83

    Partly Sunny

Today 18 Sep Northumberland

Patchy fog in the morning. Sunny, warmer with Highs in the mid 80s. Northwest Winds around 5 Mph.

Tonight 18 Sep Northumberland

Mostly clear. Patchy fog. Near steady temperature in the upper 50s. Light and variable Winds.

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Greenbrier Temperature Statistics

September Temperature

Selinsgrove Penn Valley Airport (11.2 miles)

  • Lowest 8 September, 2025

    39.9 °F

  • Average September

    63.3 °F

  • Highest 13 September, 2025

    84 °F

Climate (2020–Present)

Selinsgrove Penn Valley Airport (11.2 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    52.7 °F

  • Average High 2020–2025

    63.2 °F
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