Don Castro Reservoir Weather Forecast

    • 54
    • 72

    Increasing Clouds

    • 59
    • 84

    Becoming Sunny

    • 66
    • 87

    Partly Sunny

    • 69
    • 93

    Partly Sunny

    • 62
    • 88

    Mostly Sunny

    • 59
    • 80

    Partly Sunny

    • 58
    • 76

    Partly Sunny

Today 6 Sep San Francisco Bay Shoreline

Sunny. Highs in the upper 60s to mid 70s. West Winds 10 to 20 Mph.

Tonight 6 Sep San Francisco Bay Shoreline

Mostly clear. Lows in the upper 50s. West Winds 10 to 20 Mph. Becoming south 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Don Castro Reservoir Temperature Statistics

September Temperature

Hayward, Hayward Air Terminal (3.7 miles)

  • Lowest 2 September, 2026

    58.6 °F

  • Average September

    66.1 °F

  • Highest 3 September, 2026

    75.7 °F

Climate (2021–2026)

Hayward, Hayward Air Terminal (3.7 miles)

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  • Average Low 2021–2026

    52.4 °F

  • Average 2021–2026

    59.8 °F

  • Average High 2021–2026

    69.2 °F
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