Bethel Island Weather Forecast

    • 51
    • 64

    Rain Showers

    • 53
    • 62

    Chance Rain Showers

    • 51
    • 66

    Partly Sunny

    • 51
    • 69

    Mostly Sunny

    • 53
    • 72

    Mostly Sunny

    • 54
    • 75

    Sunny

    • 53
    • 74

    Mostly Sunny

Today 13 Oct East Bay Interior Valleys

Showers and a slight chance of Thunderstorms. Highs in the mid 60s. South Winds 10 to 15 Mph.

Tonight 13 Oct East Bay Interior Valleys

Showers in the Evening, then Showers likely after midnight. Lows around 50. South Winds 5 to 10 Mph. Becoming southeast after midnight.

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Bethel Island Temperature Statistics

October Temperature

Concord, Buchanan Field (22.4 miles)

  • Lowest 11 October, 2025

    52 °F

  • Average October

    66 °F

  • Highest 7 October, 2025

    90 °F

Climate (2020–Present)

Concord, Buchanan Field (22.4 miles)

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  • Average Low 2020–2025

    50.7 °F

  • Average 2020–2025

    61.3 °F

  • Average High 2020–2025

    74.5 °F
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