Hilltop Lake Weather Forecast

    • 57
    • 67

    Decreasing Clouds

    • 57
    • 66

    Partly Sunny

    • 57
    • 70

    Partly Sunny

    • 59
    • 82

    Partly Sunny

    • 60
    • 81

    Partly Sunny

    • 58
    • 76

    Partly Sunny

Today 20 Sep East Bay Interior Valleys

Mostly cloudy. Highs near 80. West Winds 5 to 10 Mph.

Tonight 20 Sep East Bay Interior Valleys

Mostly cloudy in the evening then becoming partly cloudy. Lows in the upper 50s. Southwest Winds 5 to 10 Mph.

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Hilltop Lake Temperature Statistics

September Temperature

Concord, Buchanan Field (14.9 miles)

  • Lowest 7 September, 2026

    54.6 °F

  • Average September

    71.9 °F

  • Highest 9 September, 2026

    101.6 °F

Climate (2021–2026)

Concord, Buchanan Field (14.9 miles)

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  • Average Low 2021–2026

    51.1 °F

  • Average 2021–2026

    61.6 °F

  • Average High 2021–2026

    74.2 °F
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