Fontana Weather Forecast

    • 69
    • 98

    Hot

    • 68
    • 98

    Hot

    • 69
    • 100

    Hot

    • 66
    • 99

    Hot

    • 64
    • 93

    Mostly Sunny

    • 61
    • 89

    Partly Sunny

Today 17 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Hot. Highs 93 to 100. Areas of Winds east 10 to 15 Mph with Gusts to 30 Mph becoming north with Gusts to 25 Mph this afternoon.

Tonight 17 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 58 to 62 in wind Sheltered Areas to 62 to 70 in warmer Locations. Areas of Winds east to 10 Mph in the evening becoming light.

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Fontana Temperature Statistics

March Temperature

Ontario International Airport (8.1 miles)

  • Lowest 6 March, 2026

    51.1 °F

  • Average March

    67 °F

  • Highest 12 March, 2026

    91 °F

Climate (2021–Present)

Ontario International Airport (8.1 miles)

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  • Average Low 2021–2026

    55.7 °F

  • Average 2021–2026

    66.9 °F

  • Average High 2021–2026

    79.2 °F
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