Fontana Weather Forecast

    • 54
    • 72

    Partly Sunny

    • 59
    • 81

    Mostly Sunny

    • 61
    • 88

    Sunny

    • 60
    • 89

    Mostly Sunny

    • 60
    • 86

    Mostly Sunny

    • 61
    • 86

    Mostly Sunny

Today 29 May San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy this morning. Becoming partly cloudy. Patchy fog this morning. Highs 68 to 73. Areas of Winds southwest to 10 Mph becoming west with Gusts to 25 Mph this afternoon.

Tonight 29 May San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Patchy fog overnight. Lows 47 to 53. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

May Temperature

Ontario International Airport (8.1 miles)

  • Lowest 6 May, 2026

    49.6 °F

  • Average May

    68.5 °F

  • Highest 11 May, 2026

    96.7 °F

Climate (2021–Present)

Ontario International Airport (8.1 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.1 °F

  • Average High 2021–2026

    79.4 °F
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