San Francisco Bay - Hercules, Refugio Landing Weather Forecast

    • 60
    • 74

    Becoming Sunny

    • 60
    • 69

    Mostly Sunny

    • 58
    • 67

    Mostly Sunny

    • 56
    • 71

    Mostly Sunny

    • 57
    • 75

    Mostly Sunny

    • 57
    • 70

    Partly Sunny

    • 57
    • 69

    Mostly Sunny

Today 10 Sep East Bay Interior Valleys

Sunny. Highs in the upper 90s. West Winds around 15 Mph.

Tonight 10 Sep East Bay Interior Valleys

Mostly clear. Lows in the lower 60s. Southwest Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

San Francisco Bay - Hercules, Refugio Landing Temperature Statistics

September Temperature

Napa, Napa County Airport (12.4 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    65.7 °F

  • Highest 8 September, 2026

    93 °F

Climate (2021–2026)

Napa, Napa County Airport (12.4 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    70.3 °F
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