San Ramon Weather Forecast

    • 56
    • 81

    Increasing Clouds

    • 56
    • 85

    Increasing Clouds

    • 55
    • 76

    Mostly Cloudy

    • 55
    • 78

    Partly Sunny

    • 56
    • 83

    Mostly Sunny

    • 61
    • 94

    Mostly Sunny

    • 60
    • 94

    Mostly Sunny

Today 18 Sep East Bay Interior Valleys

Sunny. Highs around 90.

Tonight 18 Sep East Bay Interior Valleys

Clear. Lows in the upper 50s. Southwest Winds 5 to 10 Mph.

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San Ramon Temperature Statistics

September Temperature

Livermore, Livermore Municipal Airport (10.6 miles)

  • Lowest 5 September, 2026

    50.6 °F

  • Average September

    70.5 °F

  • Highest 9 September, 2026

    104.6 °F

Climate (2021–2026)

Livermore, Livermore Municipal Airport (10.6 miles)

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  • Average Low 2021–2026

    49 °F

  • Average 2021–2026

    61 °F

  • Average High 2021–2026

    74.1 °F
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