Pioneer Park Weather Forecast

    • 54
    • 82

    Mostly Sunny

    • 52
    • 79

    Mostly Sunny

    • 53
    • 76

    Mostly Cloudy

    • 53
    • 77

    Patchy Fog

    • 54
    • 79

    Mostly Sunny

    • 54
    • 77

    Partly Sunny

Today 11 Dec Orange County Inland

Mostly sunny. Highs 76 to 79 towards the coast to 80 to 83 farther inland. Light Winds.

Tonight 11 Dec Orange County Inland

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 52 to 55. Light Winds.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Pioneer Park Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 5 December, 2025

    45 °F

  • Average December

    61.3 °F

  • Highest 9 December, 2025

    82 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (6.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    66 °F

  • Average High 2020–2025

    76.4 °F
Get WillyWeather+ to remove ads