Fontana Weather Forecast

    • 58
    • 74

    Rain Showers

    • 52
    • 71

    Rain Showers

    • 49
    • 62

    Rain Showers

    • 49
    • 63

    Chance Rain Showers

    • 48
    • 64

    Chance Rain Showers

    • 49
    • 67

    Partly Sunny

Today 20 Sep Lebanon

Showers with a chance of Thunderstorms. Near steady temperature in the lower 70s. Southwest Winds 5 to 10 Mph. Chance of rain near 100 percent.

Tonight 20 Sep Lebanon

Mostly cloudy. Showers likely with a slight chance of Thunderstorms in the evening. Lows in the upper 50s. North Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

September Temperature

Muir Army Air Field / Indiantown (11.2 miles)

  • Lowest 15 September, 2026

    45.3 °F

  • Average September

    72.3 °F

  • Highest 1 September, 2026

    92.1 °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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