Fontana Weather Forecast

    • 58
    • 81

    Slight Chance Thunderstorms

    • 58
    • 78

    Mostly Sunny

    • 58
    • 81

    Mostly Sunny

    • 65
    • 84

    Chance Rain Showers

    • 66
    • 84

    Rain Showers Likely

    • 64
    • 85

    Chance Rain Showers

Today 23 Aug Lebanon

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs around 80. West Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 23 Aug Lebanon

Mostly clear. Lows in the upper 50s. West Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

August Temperature

Muir Army Air Field / Indiantown (11.2 miles)

  • Lowest 4 August, 2026

    60.6 °F

  • Average August

    76 °F

  • Highest 9 August, 2026

    91 °F

Climate (2021–2026)

Muir Army Air Field / Indiantown (11.2 miles)

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    54.8 °F

  • Average High 2021–2026

    64.1 °F
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