Del Rosa Weather Forecast

    • 60
    • 83

    Increasing Clouds

    • 66
    • 87

    Mostly Sunny

    • 69
    • 94

    Sunny

    • 69
    • 95

    Mostly Sunny

    • 68
    • 93

    Mostly Sunny

    • 66
    • 98

    Hot

Today 21 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 78 to 83. Areas of Winds south to 10 Mph becoming southwest with Gusts to 25 Mph this afternoon.

Tonight 21 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Patchy fog overnight. Lows 52 to 60. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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  • Temperature Real-Time

Del Rosa Temperature Statistics

September Temperature

San Bernardino Intl. Airport (3.7 miles)

  • Lowest 19 September, 2026

    57.2 °F

  • Average September

    74.7 °F

  • Highest 9 September, 2026

    105.8 °F

Climate (2021–2026)

San Bernardino Intl. Airport (3.7 miles)

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  • Average Low 2021–2026

    54.2 °F

  • Average 2021–2026

    63.2 °F

  • Average High 2021–2026

    80.3 °F
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