Coatesville Weather Forecast

    • 50
    • 74

    Becoming Sunny

    • 54
    • 75

    Mostly Sunny

    • 60
    • 80

    Mostly Sunny

    • 63
    • 82

    Partly Sunny

    • 59
    • 80

    Slight Chance Thunderstorms

    • 60
    • 77

    Chance Rain Showers

Today 14 Sep Western Chester

Sunny. Less humid with Highs in the mid 70s. North Winds 10 to 15 Mph.

Tonight 14 Sep Western Chester

Clear, cooler with Lows around 50. North Winds 5 to 10 Mph.

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Coatesville Temperature Statistics

September Temperature

Chester County Airport (1.9 miles)

  • Lowest 8 September, 2026

    54.9 °F

  • Average September

    72.4 °F

  • Highest 1 September, 2026

    87.3 °F

Climate (2021–2026)

Chester County Airport (1.9 miles)

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    54.4 °F

  • Average High 2021–2026

    63 °F
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