Harristown Weather Forecast

    • 8
    • 21

    Mostly Sunny

    • 29
    • 34

    Mostly Cloudy

    • 22
    • 43

    Partly Sunny

    • 8
    • 32

    Mostly Cloudy

    • 9
    • 17

    Snow Likely

    • 7
    • 19

    Chance Snow

Today 20 Jan Lancaster

Sunny, Colder with Highs in the lower 20s. West Winds 10 to 15 Mph with Gusts up to 25 Mph. Wind chill Values as low as 6 below this morning.

Tonight 20 Jan Lancaster

Mostly clear. Lows around 10. Southwest Winds around 5 Mph.

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Harristown Temperature Statistics

January Temperature

Chester County Airport (11.2 miles)

  • Lowest 3 January, 2026

    15.6 °F

  • Average January

    33.3 °F

  • Highest 7 January, 2026

    53.6 °F

Climate (2021–Present)

Chester County Airport (11.2 miles)

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    63 °F
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