Fontana Weather Forecast

    • 74
    • 101

    Hot

    • 72
    • 100

    Hot

    • 73
    • 100

    Hot

    • 73
    • 100

    Hot

    • 72
    • 99

    Hot

    • 68
    • 95

    Mostly Sunny

    • 63
    • 86

    Mostly Sunny

Today 4 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 78 to 83.

Tonight 4 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 68 to 73. Areas of Winds east 10 to 15 Mph.

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Fontana Temperature Statistics

October Temperature

Ontario International Airport (8.1 miles)

  • Lowest 1 October, 2026

    64.9 °F

  • Average October

    82.2 °F

  • Highest 2 October, 2026

    102.9 °F

Climate (2021–2026)

Ontario International Airport (8.1 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.2 °F

  • Average High 2021–2026

    79.3 °F
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