Stewartsville Weather Forecast

    • 56
    • 77

    Chance Rain Showers

    • 59
    • 72

    Chance Rain Showers

    • 57
    • 81

    Partly Sunny

    • 53
    • 83

    Mostly Sunny

    • 52
    • 75

    Partly Sunny

    • 53
    • 76

    Mostly Cloudy

Today 16 Sep Warren

Partly sunny. Highs in the upper 70s. Northeast Winds 5 to 10 Mph.

Tonight 16 Sep Warren

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the mid 50s. Northeast Winds around 5 Mph. Chance of rain 50 percent.

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Stewartsville Temperature Statistics

September Temperature

Allentown, Lehigh Valley International Airport (17.4 miles)

  • Lowest 8 September, 2025

    48 °F

  • Average September

    66.7 °F

  • Highest 4 September, 2025

    82.9 °F

Climate (2020–Present)

Allentown, Lehigh Valley International Airport (17.4 miles)

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  • Average Low 2020–2025

    43.7 °F

  • Average 2020–2025

    53.7 °F

  • Average High 2020–2025

    63.5 °F
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