Rosena Park West Weather Forecast

    • 72
    • 97

    Mostly Sunny

    • 70
    • 93

    Partly Sunny

    • 66
    • 84

    Rain Showers Likely

    • 64
    • 83

    Slight Chance Thunderstorms

    • 64
    • 86

    Mostly Sunny

    • 66
    • 88

    Mostly Sunny

Today 16 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 95 to 101. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 16 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear in the evening. Becoming partly cloudy. Lows 68 to 72. Areas of Winds west 10 to 15 Mph in the evening becoming light.

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Rosena Park West Temperature Statistics

September Temperature

Ontario International Airport (8.1 miles)

  • Lowest 12 September, 2025

    62.1 °F

  • Average September

    76.9 °F

  • Highest 2 September, 2025

    102 °F

Climate (2020–Present)

Ontario International Airport (8.1 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.7 °F

  • Average High 2020–2025

    79.1 °F
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