San Francisco Bay - Lone Tree Point Weather Forecast

    • 59
    • 67

    Becoming Sunny

    • 60
    • 73

    Mostly Sunny

    • 61
    • 78

    Mostly Sunny

    • 60
    • 79

    Mostly Sunny

    • 59
    • 76

    Mostly Sunny

    • 59
    • 72

    Mostly Sunny

    • 59
    • 68

    Mostly Sunny

Today 13 Sep East Bay Interior Valleys

Sunny. Highs in the mid 80s. Southwest Winds 5 to 15 Mph.

Tonight 13 Sep East Bay Interior Valleys

Mostly clear. Lows around 60. Southwest Winds 5 to 15 Mph.

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  • Temperature Real-Time

San Francisco Bay - Lone Tree Point Temperature Statistics

September Temperature

Napa, Napa County Airport (11.8 miles)

  • Lowest 3 September, 2025

    52 °F

  • Average September

    66 °F

  • Highest 1 September, 2025

    89.1 °F

Climate (2020–Present)

Napa, Napa County Airport (11.8 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.5 °F
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