Etiwanda Weather Forecast

    • 58
    • 80

    Becoming Sunny

    • 60
    • 81

    Mostly Sunny

    • 60
    • 88

    Mostly Sunny

    • 63
    • 94

    Mostly Sunny

    • 64
    • 95

    Mostly Sunny

    • 63
    • 95

    Mostly Sunny

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

Mostly sunny. Highs 78 to 84. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

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

Clear in the evening. Becoming partly cloudy. Lows 51 to 57. 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

June Temperature

Ontario International Airport (5.6 miles)

  • Lowest 1 June, 2026

    58.6 °F

  • Average June

    75.4 °F

  • Highest 12 June, 2026

    99.6 °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

    79.4 °F
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