Mercer Weather Forecast

    • 43
    • 67

    Mostly Sunny

    • 47
    • 69

    Mostly Sunny

    • 48
    • 71

    Mostly Sunny

    • 48
    • 69

    Partly Sunny

    • 48
    • 70

    Partly Sunny

    • 54
    • 72

    Partly Sunny

Today 24 Sep Mercer

Mostly sunny. Highs in the upper 60s. East Winds 5 to 10 Mph.

Tonight 24 Sep Mercer

Clear. Lows in the lower 40s. Northeast Winds around 5 Mph.

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Mercer Temperature Statistics

September Temperature

New Castle, New Castle Municipal Airport (16.2 miles)

  • Lowest 15 September, 2026

    50 °F

  • Average September

    69.4 °F

  • Highest 2 September, 2026

    91.9 °F

Climate (2021–2026)

New Castle, New Castle Municipal Airport (16.2 miles)

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  • Average Low 2021–2026

    41.7 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    61.1 °F
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