Fontana Weather Forecast

    • 63
    • 88

    Slight Chance Thunderstorms

    • 67
    • 94

    Mostly Sunny

    • 69
    • 95

    Partly Sunny

    • 54
    • 91

    Rain Showers

    • 50
    • 71

    Chance Rain Showers

    • 51
    • 68

    Chance Rain Showers

Today 17 May Lebanon

Mostly sunny. Very warm with Highs in the mid 80s. West Winds around 5 Mph.

Tonight 17 May Lebanon

Partly cloudy. Not as cool with Lows in the upper 50s. West Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

May Temperature

Muir Army Air Field / Indiantown (11.2 miles)

  • Lowest 4 May, 2026

    40.8 °F

  • Average May

    59.2 °F

  • Highest 5 May, 2026

    86.5 °F

Climate (2021–Present)

Muir Army Air Field / Indiantown (11.2 miles)

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  • Average Low 2021–2026

    45.1 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    64 °F
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