Arnold Reservoir Weather Forecast

    • 49
    • 75

    Partly Sunny

    • 50
    • 70

    Chance Rain Showers

    • 48
    • 69

    Partly Sunny

    • 52
    • 74

    Partly Sunny

    • 52
    • 72

    Partly Sunny

    • 51
    • 67

    Mostly Cloudy

    • 51
    • 68

    Partly Sunny

Today 20 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 76 to 81. Areas of Winds west to 10 Mph becoming southwest with Gusts to 25 Mph this afternoon.

Tonight 20 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Patchy fog overnight. Lows 43 to 47 in wind Sheltered Areas to 44 to 51 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Arnold Reservoir Temperature Statistics

April Temperature

Brackett Field Airport (6.8 miles)

  • Lowest 3 April, 2026

    50 °F

  • Average April

    67.8 °F

  • Highest 4 April, 2026

    86 °F

Climate (2021–Present)

Brackett Field Airport (6.8 miles)

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  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    68 °F

  • Average High 2021–2026

    76 °F
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