De Anza Park Weather Forecast

    • 67
    • 91

    Mostly Sunny

    • 68
    • 93

    Partly Sunny

    • 64
    • 87

    Mostly Sunny

    • 62
    • 83

    Mostly Sunny

    • 66
    • 88

    Mostly Sunny

    • 66
    • 90

    Sunny

Today 25 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 90 to 95. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 25 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Lows 62 to 67. Areas of Winds west 10 to 15 Mph in the evening becoming light.

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De Anza Park Temperature Statistics

September Temperature

Ontario International Airport (4.3 miles)

  • Lowest 19 September, 2026

    61.6 °F

  • Average September

    78.8 °F

  • Highest 9 September, 2026

    109.7 °F

Climate (2021–2026)

Ontario International Airport (4.3 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.2 °F

  • Average High 2021–2026

    79.3 °F
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