Rossmoor Weather Forecast

    • 58
    • 78

    Mostly Sunny

    • 60
    • 80

    Mostly Sunny

    • 60
    • 82

    Drizzle

    • 61
    • 80

    Drizzle

    • 59
    • 79

    Drizzle

    • 59
    • 79

    Partly Sunny

Today 5 Sep East Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Highs in the upper 70s to mid 80s. West Winds 5 to 15 Mph.

Tonight 5 Sep East Bay Interior Valleys

Partly cloudy. Lows in the upper 50s. West Winds 5 to 10 Mph.

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Rossmoor Temperature Statistics

September Temperature

Concord, Buchanan Field (8.1 miles)

  • Lowest 3 September, 2025

    60.1 °F

  • Average September

    74.5 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

Concord, Buchanan Field (8.1 miles)

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  • Average Low 2020–2025

    50.7 °F

  • Average 2020–2025

    61.4 °F

  • Average High 2020–2025

    74.6 °F
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