Etiwanda Weather Forecast

    • 56
    • 83

    Mostly Sunny

    • 56
    • 82

    Mostly Sunny

    • 55
    • 81

    Sunny

Today 22 May San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this morning. Becoming mostly sunny. Highs 81 to 88. Areas of Winds southwest to 10 Mph becoming west with Gusts to 30 Mph this afternoon.

Tonight 22 May San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear this evening. Becoming partly cloudy. Lows 50 to 56. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Etiwanda Temperature Statistics

May Temperature

Ontario International Airport (5.6 miles)

  • Lowest 6 May, 2026

    49.6 °F

  • Average May

    68.6 °F

  • Highest 11 May, 2026

    96.7 °F

Climate (2021–Present)

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

    79.4 °F
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