Allentown Weather Forecast

    • 63
    • 83

    Slight Chance Thunderstorms

    • 69
    • 91

    Mostly Sunny

    • 70
    • 91

    Rain Showers

    • 49
    • 77

    Rain Showers Likely

    • 54
    • 68

    Mostly Cloudy

    • 58
    • 73

    Chance Rain Showers

Today 17 May Allegheny

Mostly cloudy Early, then becoming partly sunny. A slight chance of Showers and Thunderstorms. Warm with Highs in the lower 80s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 17 May Allegheny

Mainly clear. A slight chance of Showers and Thunderstorms in the evening. Warm with Lows in the mid 60s. South Winds around 5 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Allentown Temperature Statistics

May Temperature

Pittsburgh - Allegheny County Airport (5.6 miles)

  • Lowest 2 May, 2026

    34 °F

  • Average May

    53.1 °F

  • Highest 5 May, 2026

    73.9 °F

Climate (2021–Present)

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

    63.4 °F
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