Fontana Weather Forecast

    • 68
    • 89

    Becoming Sunny

    • 70
    • 90

    Chance Thunderstorms

    • 66
    • 87

    Rain Showers Likely

    • 67
    • 85

    Chance Thunderstorms

    • 64
    • 85

    Chance Rain Showers

    • 60
    • 82

    Partly Sunny

Today 9 Aug Lebanon

Sunny. Very warm with Highs in the upper 80s. West Winds 5 to 10 Mph.

Tonight 9 Aug Lebanon

Mostly clear. Humid with Lows in the upper 60s. West Winds around 5 Mph in the Evening, becoming light and variable.

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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

    76.7 °F

  • Highest 6 August, 2026

    90.3 °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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