Olive Hills Reservoir Weather Forecast

    • 52
    • 77

    Mostly Sunny

    • 51
    • 76

    Mostly Sunny

    • 52
    • 71

    Mostly Cloudy

    • 51
    • 70

    Partly Sunny

    • 52
    • 67

    Partly Sunny

    • 53
    • 68

    Mostly Cloudy

Today 19 Jan Orange County Inland

Partly cloudy in the morning. Becoming mostly sunny. Highs around 74 towards the coast to 75 to 78 farther inland. Light Winds.

Tonight 19 Jan Orange County Inland

Mostly clear. Lows 50 to 54. Areas of Winds southwest 10 to 20 Mph becoming east 10 to 15 Mph overnight. Gusts to 35 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Olive Hills Reservoir Temperature Statistics

January Temperature

Fullerton, Fullerton Municipal Airport (9.3 miles)

  • Lowest 9 January, 2026

    42.1 °F

  • Average January

    61.9 °F

  • Highest 14 January, 2026

    84.9 °F

Climate (2021–Present)

Fullerton, Fullerton Municipal Airport (9.3 miles)

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

  • Average Low 2021–2026

    56.9 °F

  • Average 2021–2026

    66.1 °F

  • Average High 2021–2026

    76.4 °F
Get WillyWeather+ to remove ads