Grand Terrace Weather Forecast

    • 63
    • 95

    Mostly Sunny

    • 64
    • 94

    Mostly Sunny

    • 66
    • 96

    Mostly Sunny

    • 66
    • 96

    Mostly Sunny

    • 65
    • 95

    Partly Sunny

    • 66
    • 95

    Mostly Sunny

Today 31 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 93 to 99. Light Winds becoming southwest 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 31 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 55 to 63. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Grand Terrace Temperature Statistics

July Temperature

San Bernardino Intl. Airport (5 miles)

  • Lowest 26 July, 2025

    58.6 °F

  • Average July

    72.1 °F

  • Highest 10 July, 2025

    102.2 °F

Climate (2020–Present)

San Bernardino Intl. Airport (5 miles)

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  • Average Low 2020–2025

    54.1 °F

  • Average 2020–2025

    63.2 °F

  • Average High 2020–2025

    80.6 °F
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