Riverside Weather Forecast

    • 57
    • 85

    Mostly Sunny

    • 50
    • 83

    Mostly Sunny

    • 54
    • 79

    Partly Sunny

    • 59
    • 77

    Partly Sunny

    • 60
    • 81

    Partly Sunny

    • 60
    • 84

    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. Lows in the upper 50s. Northwest Winds around 5 Mph.

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Riverside Temperature Statistics

September Temperature

Selinsgrove Penn Valley Airport (15.5 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 (15.5 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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