San Bernardino Weather Forecast

    • 72
    • 92

    Mostly Sunny

    • 74
    • 96

    Mostly Sunny

    • 76
    • 101

    Hot

    • 74
    • 101

    Hot

    • 68
    • 97

    Hot

    • 66
    • 92

    Sunny

Today 7 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this morning. Becoming mostly sunny. Warmer. Highs 88 to 94. Light Winds becoming northwest 10 Mph this afternoon.

Tonight 7 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear in the evening. Becoming partly cloudy. Lows 67 to 71. Areas of Winds northwest to 10 Mph in the evening becoming light.

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San Bernardino Temperature Statistics

September Temperature

San Bernardino Intl. Airport (2.5 miles)

  • Lowest 2 September, 2026

    59 °F

  • Average September

    71.2 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

San Bernardino Intl. Airport (2.5 miles)

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  • Average Low 2021–2026

    54.2 °F

  • Average 2021–2026

    63.2 °F

  • Average High 2021–2026

    80.4 °F
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