Mercer Weather Forecast

    • 56
    • 83

    Mostly Sunny

    • 55
    • 82

    Mostly Sunny

    • 53
    • 80

    Mostly Sunny

    • 53
    • 83

    Mostly Sunny

    • 50
    • 81

    Mostly Sunny

    • 55
    • 78

    Partly Sunny

Today 15 Sep Mercer

Mostly sunny. Near steady temperature in the lower 80s. East Winds around 5 Mph.

Tonight 15 Sep Mercer

Mainly clear. Lows in the upper 50s. East Winds around 5 Mph.

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Mercer Temperature Statistics

September Temperature

New Castle, New Castle Municipal Airport (16.2 miles)

  • Lowest 8 September, 2025

    37.9 °F

  • Average September

    60.9 °F

  • Highest 3 September, 2025

    82 °F

Climate (2020–Present)

New Castle, New Castle Municipal Airport (16.2 miles)

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  • Average Low 2020–2025

    41.9 °F

  • Average 2020–2025

    51.3 °F

  • Average High 2020–2025

    61.1 °F
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