Summit Heights Weather Forecast

    • 64
    • 90

    Sunny

    • 67
    • 93

    Sunny

    • 67
    • 95

    Sunny

    • 68
    • 94

    Mostly Sunny

    • 66
    • 92

    Chance Thunderstorms

    • 65
    • 89

    Slight Chance Thunderstorms

Today 14 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with patchy fog in the morning. Becoming sunny. Highs 88 to 94. Light Winds becoming west 10 Mph in the afternoon.

Tonight 14 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 59 to 65. Areas of Winds west to 10 Mph in the evening becoming light.

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Summit Heights Temperature Statistics

September Temperature

Ontario International Airport (8.7 miles)

  • Lowest 9 September, 2025

    63 °F

  • Average September

    78.8 °F

  • Highest 2 September, 2025

    102 °F

Climate (2020–Present)

Ontario International Airport (8.7 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.7 °F

  • Average High 2020–2025

    79.1 °F
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