Arnold Reservoir Weather Forecast

    • 60
    • 88

    Mostly Sunny

    • 59
    • 87

    Mostly Sunny

    • 62
    • 88

    Mostly Sunny

    • 63
    • 90

    Partly Sunny

    • 63
    • 89

    Partly Sunny

    • 64
    • 88

    Mostly Sunny

Today 31 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 91 to 98. Light Winds becoming west 10 to 15 Mph this afternoon.

Tonight 31 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 58 to 63. Areas of Winds west 10 Mph in the evening becoming light.

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Arnold Reservoir Temperature Statistics

July Temperature

Brackett Field Airport (6.8 miles)

  • Lowest 1 July, 2025

    59 °F

  • Average July

    78.2 °F

  • Highest 9 July, 2025

    95 °F

Climate (2020–Present)

Brackett Field Airport (6.8 miles)

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  • Average Low 2020–2025

    55.7 °F

  • Average 2020–2025

    67.8 °F

  • Average High 2020–2025

    75.7 °F
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