Mercer Weather Forecast

    • 34
    • 54

    Rain

    • 19
    • 37

    Snow Showers

    • 18
    • 26

    Snow Showers

    • 12
    • 29

    Snow Showers

    • 10
    • 22

    Chance Snow Showers

    • 14
    • 24

    Mostly Cloudy

    • 14
    • 31

    Chance Snow Showers

Today 28 Dec Mercer

Rain, mild. Highs in the mid 50s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 90 percent.

Tonight 28 Dec Mercer

A slight chance of Thunderstorms. A chance of rain in the Evening, then rain after midnight. Lows in the mid 30s. Southwest Winds 15 to 20 Mph. Gusts up to 45 Mph after midnight. Chance of rain near 100 percent.

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Mercer Temperature Statistics

December Temperature

New Castle, New Castle Municipal Airport (16.2 miles)

  • Lowest 5 December, 2025

    1 °F

  • Average December

    27.9 °F

  • Highest 18 December, 2025

    57 °F

Climate (2020–Present)

New Castle, New Castle Municipal Airport (16.2 miles)

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  • Average Low 2020–2025

    41.7 °F

  • Average 2020–2025

    51.3 °F

  • Average High 2020–2025

    61.1 °F
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