Arnold Reservoir Weather Forecast

    • 69
    • 102

    Hot

    • 65
    • 94

    Mostly Sunny

    • 61
    • 88

    Mostly Sunny

    • 61
    • 82

    Sunny

    • 58
    • 81

    Sunny

    • 57
    • 80

    Sunny

Today 10 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Hot. Highs 100 to 108. Areas of Winds south to 10 Mph becoming west with Gusts to 25 Mph this afternoon.

Tonight 10 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 68 to 73. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Arnold Reservoir Temperature Statistics

September Temperature

Brackett Field Airport (6.8 miles)

  • Lowest 2 September, 2026

    60.8 °F

  • Average September

    76.9 °F

  • Highest 5 September, 2026

    89.6 °F

Climate (2021–2026)

Brackett Field Airport (6.8 miles)

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  • Average Low 2021–2026

    56 °F

  • Average 2021–2026

    68.1 °F

  • Average High 2021–2026

    76 °F
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