Fontana Weather Forecast

    • 52
    • 75

    Mostly Sunny

    • 51
    • 76

    Mostly Sunny

    • 51
    • 74

    Slight Chance Thunderstorms

    • 53
    • 75

    Mostly Sunny

    • 58
    • 81

    Mostly Sunny

    • 64
    • 87

    Partly Sunny

Today 31 May Lebanon

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph.

Tonight 31 May Lebanon

Clear. Lows in the mid 40s. North 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

    63.6 °F

  • Highest 18 May, 2026

    94.6 °F

Climate (2021–Present)

Muir Army Air Field / Indiantown (11.2 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    64 °F
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