Irwin Weather Forecast

    • 61
    • 85

    Mostly Cloudy

    • 60
    • 83

    Slight Chance Rain Showers

    • 59
    • 74

    Slight Chance Rain Showers

    • 60
    • 79

    Partly Sunny

    • 63
    • 85

    Mostly Sunny

    • 64
    • 89

    Mostly Sunny

    • 63
    • 88

    Slight Chance Thunderstorms

Today 14 Sep Southern Lancaster

Mostly sunny. Near steady temperature in the mid 80s. Northeast Winds around 10 Mph.

Tonight 14 Sep Southern Lancaster

Mostly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph.

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Irwin Temperature Statistics

September Temperature

Lancaster County-mc Whirter Field (2.5 miles)

  • Lowest 1 September, 2025

    55.4 °F

  • Average September

    70.9 °F

  • Highest 6 September, 2025

    93.2 °F

Climate (2020–Present)

Lancaster County-mc Whirter Field (2.5 miles)

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  • Average Low 2020–2025

    51.9 °F

  • Average 2020–2025

    62.3 °F

  • Average High 2020–2025

    73.7 °F
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