Etiwanda Creek Park Weather Forecast

    • 59
    • 80

    Becoming Sunny

    • 61
    • 85

    Mostly Sunny

    • 64
    • 88

    Sunny

    • 68
    • 92

    Sunny

    • 70
    • 94

    Sunny

    • 70
    • 94

    Sunny

Today 28 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the morning. Becoming mostly sunny. Highs 80 to 85. Areas of Winds south to 10 Mph becoming southwest with Gusts to 25 Mph in the afternoon.

Tonight 28 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 52 to 60. Areas of Winds southwest 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Etiwanda Creek Park Temperature Statistics

September Temperature

Ontario International Airport (6.8 miles)

  • Lowest 19 September, 2026

    61.6 °F

  • Average September

    78.9 °F

  • Highest 9 September, 2026

    109.7 °F

Climate (2021–2026)

Ontario International Airport (6.8 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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