Mercer Weather Forecast

    • 58
    • 80

    Thunderstorms

    • 62
    • 83

    Chance Rain Showers

    • 65
    • 84

    Rain Showers

    • 60
    • 80

    Chance Rain Showers

    • 57
    • 76

    Slight Chance Thunderstorms

    • 58
    • 79

    Mostly Sunny

Today 25 Jul Mercer

Mostly cloudy with isolated Showers this Morning, then partly sunny with scattered Showers with isolated Thunderstorms this afternoon. Highs around 80. South Winds around 5 Mph. Chance of rain 50 percent.

Tonight 25 Jul Mercer

Partly cloudy. Scattered Showers with isolated Thunderstorms in the evening. Patchy fog after midnight. Lows in the upper 50s. Northwest Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 40 percent.

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Mercer Temperature Statistics

July Temperature

New Castle, New Castle Municipal Airport (16.2 miles)

  • Lowest 23 July, 2026

    48 °F

  • Average July

    73.7 °F

  • Highest 1 July, 2026

    95 °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

    51.3 °F

  • Average High 2021–2026

    61.1 °F
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