Fontana Weather Forecast

    • 71
    • 101

    Hot

    • 70
    • 99

    Hot

    • 66
    • 93

    Mostly Sunny

    • 62
    • 84

    Chance Rain Showers

    • 54
    • 75

    Rain Showers Likely

    • 51
    • 68

    Rain Showers Likely

    • 51
    • 70

    Chance Rain Showers

Today 7 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 73 to 78.

Tonight 7 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 66 to 71. Areas of Winds west to 10 Mph with Gusts to 25 Mph this evening becoming light.

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  • Temperature Real-Time

Fontana Temperature Statistics

October Temperature

Ontario International Airport (8.1 miles)

  • Lowest 1 October, 2026

    65.6 °F

  • Average October

    86.1 °F

  • Highest 2 October, 2026

    103.6 °F

Climate (2021–2026)

Ontario International Airport (8.1 miles)

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  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    67.2 °F

  • Average High 2021–2026

    79.4 °F
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