Upland Weather Forecast

    • 71
    • 90

    Becoming Sunny

    • 73
    • 93

    Mostly Sunny

    • 74
    • 97

    Hot

    • 72
    • 95

    Mostly Sunny

    • 67
    • 91

    Sunny

    • 64
    • 88

    Mostly Sunny

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

Partly cloudy this morning. Becoming mostly sunny. A slight chance of Showers and Thunderstorms. Warmer. Highs 88 to 94. Light Winds becoming northwest 10 Mph this afternoon. Chance of measurable precipitation 20 percent.

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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Upland Temperature Statistics

September Temperature

Ontario International Airport (5 miles)

  • Lowest 5 September, 2026

    63 °F

  • Average September

    76.5 °F

  • Highest 5 September, 2026

    93.9 °F

Climate (2021–2026)

Ontario International Airport (5 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.2 °F

  • Average High 2021–2026

    79.3 °F
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