Allentown Weather Forecast

    • 69
    • 87

    Chance Thunderstorms

    • 66
    • 84

    Rain Showers Likely

    • 59
    • 79

    Partly Sunny

    • 65
    • 79

    Rain Showers

    • 63
    • 79

    Rain Showers Likely

    • 62
    • 75

    Chance Thunderstorms

    • 62
    • 76

    Chance Thunderstorms

Today 16 Sep Allegheny

Partly sunny with a chance of Showers and Thunderstorms. Unseasonably warm. Near steady temperature in the mid 80s. West Winds around 5 Mph. Chance of rain 50 percent. Heat index Values in the mid 90s.

Tonight 16 Sep Allegheny

A chance of Thunderstorms in the evening. Mostly cloudy with a chance of Showers. Patchy fog in the evening. Areas of fog after midnight. Warm with Lows in the upper 60s. South Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Allentown Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (5.6 miles)

  • Lowest 14 September, 2026

    57 °F

  • Average September

    72.4 °F

  • Highest 2 September, 2026

    91 °F

Climate (2021–2026)

Pittsburgh - Allegheny County Airport (5.6 miles)

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    63.3 °F
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