Mertztown Weather Forecast

    • 41
    • 43

    Rain

    • 24
    • 54

    Rain Showers Likely

    • 31
    • 37

    Mostly Cloudy

    • 24
    • 44

    Mostly Sunny

    • 24
    • 34

    Partly Sunny

    • 31
    • 40

    Slight Chance Rain

Today 18 Dec Berks

Partly sunny in the Morning, then becoming mostly cloudy. Patchy freezing fog in the morning. Highs in the lower 40s. East Winds 5 to 10 Mph.

Tonight 18 Dec Berks

Rain, breezy and not as cool with Lows around 40. Temperature rising into the lower 50s after midnight. Southeast Winds 10 to 15 Mph with Gusts up to 30 Mph, becoming south 15 to 25 Mph with Gusts up to 45 Mph after midnight. Chance of rain near 100 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mertztown Temperature Statistics

December Temperature

Allentown Queen City Municipal Airport (9.9 miles)

  • Lowest 9 December, 2025

    12.2 °F

  • Average December

    29.5 °F

  • Highest 1 December, 2025

    41 °F

Climate (2020–Present)

Allentown Queen City Municipal Airport (9.9 miles)

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  • Average Low 2020–2025

    45.9 °F

  • Average 2020–2025

    54.9 °F

  • Average High 2020–2025

    64 °F
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