Allentown Weather Forecast

    • 66
    • 83

    Chance Rain Showers

    • 55
    • 81

    Mostly Sunny

    • 59
    • 73

    Rain Showers

    • 57
    • 73

    Rain Showers

    • 54
    • 69

    Slight Chance Rain Showers

    • 52
    • 66

    Chance Rain Showers

Today 17 Sep Lehigh

Mostly cloudy with a 50 percent chance of Showers. Highs in the lower 80s. South Winds around 5 Mph.

Tonight 17 Sep Lehigh

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms in the Evening, then a slight chance of Showers after midnight. Humid with Lows in the mid 60s. Southwest Winds around 5 Mph, becoming northwest after midnight. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Allentown Temperature Statistics

September Temperature

Allentown Queen City Municipal Airport (2.5 miles)

  • Lowest 15 September, 2026

    46.4 °F

  • Average September

    70.7 °F

  • Highest 1 September, 2026

    87.8 °F

Climate (2021–2026)

Allentown Queen City Municipal Airport (2.5 miles)

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  • Average Low 2021–2026

    45.8 °F

  • Average 2021–2026

    54.9 °F

  • Average High 2021–2026

    64 °F
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