Fullerton Weather Forecast

    • 69
    • 89

    Chance Rain Showers

    • 67
    • 88

    Slight Chance Thunderstorms

    • 67
    • 91

    Chance Thunderstorms

    • 62
    • 82

    Slight Chance Rain Showers

    • 61
    • 80

    Chance Rain Showers

    • 60
    • 78

    Chance Rain Showers

Today 15 Aug Lehigh

Sunny. A chance of Showers with a slight chance of Thunderstorms in the afternoon. Hot with Highs in the upper 80s. East Winds around 5 Mph. Chance of rain 30 percent.

Tonight 15 Aug Lehigh

Partly cloudy with a chance of Showers in the Evening, then mostly cloudy after midnight. Humid with Lows in the upper 60s. Southeast Winds around 5 Mph. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fullerton Temperature Statistics

August Temperature

Allentown, Lehigh Valley International Airport (1.2 miles)

  • Lowest 3 August, 2025

    53.7 °F

  • Average August

    71.9 °F

  • Highest 12 August, 2025

    91 °F

Climate (2020–Present)

Allentown, Lehigh Valley International Airport (1.2 miles)

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  • Average Low 2020–2025

    43.8 °F

  • Average 2020–2025

    53.8 °F

  • Average High 2020–2025

    63.5 °F
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