Cottonwood Bay Weather Forecast

    • 57
    • 80

    Mostly Sunny

    • 61
    • 86

    Sunny

    • 70
    • 94

    Sunny

    • 66
    • 97

    Hot

    • 64
    • 89

    Mostly Sunny

    • 60
    • 87

    Mostly Sunny

    • 59
    • 83

    Mostly Sunny

Today 21 Sep West Side Mountains north of 198

Sunny. Highs 79 to 87.

Tonight 21 Sep West Side Mountains north of 198

Mostly clear. Lows 56 to 62. West Winds up to 10 Mph with Gusts to around 30 Mph.

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Cottonwood Bay Temperature Statistics

September Temperature

Hollister, CA (21.1 miles)

  • Lowest 14 September, 2026

    48.2 °F

  • Average September

    67.4 °F

  • Highest 9 September, 2026

    105.8 °F

Climate (2021–2026)

Hollister, CA (21.1 miles)

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  • Average Low 2021–2026

    46.7 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    72.8 °F
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