Arnold Reservoir Weather Forecast

    • 53
    • 78

    Mostly Sunny

    • 55
    • 74

    Partly Sunny

    • 56
    • 73

    Mostly Cloudy

    • 56
    • 71

    Mostly Cloudy

    • 54
    • 68

    Chance Rain Showers

    • 53
    • 66

    Chance Rain Showers

Today 26 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 76 to 81. Light Winds becoming west to 10 Mph in the afternoon.

Tonight 26 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 51 to 56. Areas of Winds west to 10 Mph in the evening becoming light.

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Arnold Reservoir Temperature Statistics

October Temperature

Brackett Field Airport (6.8 miles)

  • Lowest 13 October, 2026

    51.8 °F

  • Average October

    78.2 °F

  • Highest 2 October, 2026

    102.2 °F

Climate (2021–2026)

Brackett Field Airport (6.8 miles)

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  • Average Low 2021–2026

    56.3 °F

  • Average 2021–2026

    68.2 °F

  • Average High 2021–2026

    76.1 °F
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