Fullerton Weather Forecast

    • 36
    • 42

    Rain

    • 28
    • 42

    Rain/Snow

    • 29
    • 40

    Partly Sunny

    • 33
    • 45

    Mostly Cloudy

    • 28
    • 47

    Slight Chance Rain

    • 20
    • 37

    Chance Rain

Today 10 Jan Lehigh

Cloudy. A chance of rain in the Morning, then rain in the afternoon. Highs in the lower 40s. Northeast Winds around 5 Mph. Chance of rain 90 percent.

Tonight 10 Jan Lehigh

Rain likely. Near steady temperature in the upper 30s. Northeast Winds around 5 Mph, becoming west after midnight. Chance of rain 70 percent.

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Fullerton Temperature Statistics

January Temperature

Allentown, Lehigh Valley International Airport (1.2 miles)

  • Lowest 1 January, 2026

    17.1 °F

  • Average January

    29.7 °F

  • Highest 7 January, 2026

    50 °F

Climate (2021–Present)

Allentown, Lehigh Valley International Airport (1.2 miles)

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  • Average Low 2021–2026

    43.7 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    63.4 °F
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