Arrowhead Weather Forecast

    • 63
    • 92

    Sunny

    • 61
    • 89

    Mostly Sunny

    • 61
    • 89

    Sunny

    • 60
    • 90

    Mostly Sunny

    • 65
    • 91

    Mostly Sunny

    • 68
    • 91

    Slight Chance Rain Showers

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

Mostly sunny. Highs 89 to 94. Areas of Winds south to 10 Mph becoming southwest with Gusts to 25 Mph this afternoon.

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

Mostly clear. Lows 58 to 63. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Arrowhead Temperature Statistics

August Temperature

San Bernardino Intl. Airport (5 miles)

  • Lowest 15 August, 2026

    63.9 °F

  • Average August

    81.3 °F

  • Highest 26 August, 2026

    109.4 °F

Climate (2021–2026)

San Bernardino Intl. Airport (5 miles)

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  • Average Low 2021–2026

    54.2 °F

  • Average 2021–2026

    63.2 °F

  • Average High 2021–2026

    80.4 °F
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