Summit Heights Weather Forecast

    • 73
    • 99

    Hot

    • 69
    • 99

    Hot

    • 66
    • 93

    Partly Sunny

    • 67
    • 92

    Mostly Sunny

    • 67
    • 95

    Mostly Sunny

    • 66
    • 96

    Sunny

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

Sunny, hot. Highs 97 to 102. Light Winds becoming west 10 to 15 Mph in the afternoon.

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

Clear. Lows 60 to 64 in wind Sheltered Areas to 64 to 73 in warmer Locations. Areas of Winds west 10 to 15 Mph in the evening becoming light.

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Summit Heights Temperature Statistics

March Temperature

Ontario International Airport (8.7 miles)

  • Lowest 6 March, 2026

    51.1 °F

  • Average March

    67.7 °F

  • Highest 16 March, 2026

    93.9 °F

Climate (2021–Present)

Ontario International Airport (8.7 miles)

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  • Average Low 2021–2026

    55.7 °F

  • Average 2021–2026

    66.9 °F

  • Average High 2021–2026

    79.2 °F
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