Fontana Weather Forecast

    • 58
    • 80

    Chance Rain

    • 61
    • 69

    Rain Likely

    • 59
    • 83

    Partly Sunny

    • 56
    • 85

    Mostly Sunny

    • 56
    • 79

    Partly Sunny

    • 56
    • 78

    Mostly Cloudy

Today 16 Sep Lebanon

Mostly cloudy. Highs in the upper 70s. East Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 16 Sep Lebanon

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the upper 50s. East Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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Fontana Temperature Statistics

September Temperature

Muir Army Air Field / Indiantown (11.2 miles)

  • Lowest 9 September, 2025

    47.3 °F

  • Average September

    67.4 °F

  • Highest 13 September, 2025

    85.6 °F

Climate (2020–Present)

Muir Army Air Field / Indiantown (11.2 miles)

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  • Average Low 2020–2025

    45.5 °F

  • Average 2020–2025

    55 °F

  • Average High 2020–2025

    64.3 °F
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