Mercer Weather Forecast

    • 22
    • 39

    Increasing Clouds

    • 14
    • 30

    Partly Sunny

    • 27
    • 34

    Rain/Snow Likely

    • 26
    • 45

    Chance Rain

    • 32
    • 41

    Rain Likely

    • 41
    • 54

    Rain Likely

Today 20 Dec Mercer

Partly cloudy in the Morning, then becoming cloudy. Highs in the upper 30s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 20 Dec Mercer

Mostly cloudy. Lows in the lower 20s. Southwest Winds 10 to 15 Mph.

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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

    24.7 °F

  • Highest 17 December, 2025

    45 °F

Climate (2020–Present)

New Castle, New Castle Municipal Airport (16.2 miles)

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  • Average Low 2020–2025

    41.8 °F

  • Average 2020–2025

    51.3 °F

  • Average High 2020–2025

    61 °F
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