Diamond Valley Lake Weather Forecast

    • 60
    • 88

    Mostly Sunny

    • 62
    • 89

    Mostly Sunny

    • 67
    • 95

    Sunny

    • 69
    • 97

    Hot

    • 70
    • 97

    Breezy

    • 71
    • 97

    Hot

Today 29 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 85 to 90. Areas of Winds northwest 10 to 15 Mph. Gusts to 30 Mph in the afternoon.

Tonight 29 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 57 to 62. Areas of Winds southeast 10 to 15 Mph with Gusts to 25 Mph. Becoming to 10 Mph overnight.

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Diamond Valley Lake Temperature Statistics

September Temperature

Murrieta/Temecula French Valley (9.3 miles)

  • Lowest 3 September, 2026

    55.6 °F

  • Average September

    74.3 °F

  • Highest 9 September, 2026

    105.3 °F

Climate (2021–2026)

Murrieta/Temecula French Valley (9.3 miles)

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  • Average Low 2021–2026

    51 °F

  • Average 2021–2026

    63.1 °F

  • Average High 2021–2026

    78.1 °F
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