Etiwanda Weather Forecast

    • 71
    • 101

    Hot

    • 71
    • 99

    Hot

    • 70
    • 99

    Hot

    • 70
    • 98

    Hot

    • 70
    • 98

    Mostly Sunny

    • 70
    • 98

    Mostly Sunny

Today 19 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 99 to 105. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 19 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 66 to 72. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Etiwanda Temperature Statistics

August Temperature

Ontario International Airport (5.6 miles)

  • Lowest 15 August, 2026

    65.6 °F

  • Average August

    82.7 °F

  • Highest 1 August, 2026

    102.7 °F

Climate (2021–2026)

Ontario International Airport (5.6 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.1 °F

  • Average High 2021–2026

    79.3 °F
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