Belfast Weather Forecast

    • 57
    • 83

    Mostly Sunny

    • 55
    • 82

    Increasing Clouds

    • 57
    • 79

    Chance Rain Showers

    • 58
    • 75

    Chance Rain Showers

    • 58
    • 81

    Mostly Sunny

    • 54
    • 84

    Mostly Sunny

    • 50
    • 75

    Partly Sunny

Today 14 Sep Northampton

Sunny. Highs in the lower 80s. North Winds around 5 Mph.

Tonight 14 Sep Northampton

Partly cloudy this Evening, then clearing. Patchy fog after midnight. Lows in the upper 50s. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Belfast Temperature Statistics

September Temperature

Allentown, Lehigh Valley International Airport (12.4 miles)

  • Lowest 8 September, 2025

    48 °F

  • Average September

    66.5 °F

  • Highest 4 September, 2025

    82.9 °F

Climate (2020–Present)

Allentown, Lehigh Valley International Airport (12.4 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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