Bethlehem Weather Forecast

    • 55
    • 77

    Mostly Sunny

    • 55
    • 73

    Partly Sunny

    • 56
    • 81

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 57
    • 81

    Partly Sunny

Today 9 Sep Northampton

Sunny. Near steady temperature in the lower 70s. East Winds 5 to 10 Mph.

Tonight 9 Sep Northampton

Mostly clear in the Evening, then becoming mostly cloudy. Lows in the lower 50s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Bethlehem Temperature Statistics

September Temperature

Allentown, Lehigh Valley International Airport (4.3 miles)

  • Lowest 1 September, 2025

    52 °F

  • Average September

    68.1 °F

  • Highest 4 September, 2025

    82.9 °F

Climate (2020–Present)

Allentown, Lehigh Valley International Airport (4.3 miles)

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  • Average Low 2020–2025

    43.7 °F

  • Average 2020–2025

    53.8 °F

  • Average High 2020–2025

    63.5 °F
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