Fontana Weather Forecast

    • 58
    • 86

    Mostly Sunny

    • 60
    • 86

    Mostly Sunny

    • 62
    • 89

    Mostly Sunny

    • 63
    • 92

    Mostly Sunny

    • 64
    • 96

    Sunny

    • 60
    • 89

    Mostly Sunny

    • 58
    • 85

    Mostly Sunny

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

Mostly sunny. Warmer. Highs 83 to 89. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 30 Mph this afternoon.

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

Mostly clear this evening. Becoming partly cloudy. Lows 50 to 53 in wind Sheltered Areas to 52 to 59 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Fontana Temperature Statistics

May Temperature

Ontario International Airport (8.1 miles)

  • Lowest 5 May, 2026

    53.1 °F

  • Average May

    64.9 °F

  • Highest 2 May, 2026

    82.7 °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 °F

  • Average High 2021–2026

    79.3 °F
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