Rancho Fontana Weather Forecast

    • 56
    • 77

    Becoming Sunny

    • 59
    • 86

    Mostly Sunny

    • 60
    • 87

    Sunny

    • 62
    • 89

    Sunny

    • 64
    • 94

    Sunny

    • 66
    • 97

    Hot

Today 6 May San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with patchy fog in the morning. Becoming sunny. Warmer. Highs 73 to 78. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 6 May San Bernardino and Riverside County Valleys-The Inland Empire

Clear in the evening. Becoming partly cloudy. Lows around 50 in wind Sheltered Areas to 49 to 56 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Rancho Fontana Temperature Statistics

May Temperature

Ontario International Airport (7.5 miles)

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Climate (2021–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67 °F

  • Average High 2021–2026

    79.4 °F
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