Mill Valley Weather Forecast

    • 43
    • 51

    Decreasing Clouds

    • 50
    • 58

    Mostly Cloudy

    • 53
    • 59

    Rain Likely

    • 47
    • 58

    Chance Rain

    • 50
    • 56

    Rain Likely

    • 48
    • 56

    Rain

Today 14 Dec North Bay Interior Valleys

Partly cloudy. Areas of fog in the Morning, then patchy fog in the afternoon. Highs in the 50s to lower 60s. East Winds 5 to 10 Mph. Becoming south in the afternoon.

Tonight 14 Dec North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Areas of fog. Lows in the upper 30s to lower 50s. Northwest Winds up to 5 Mph.

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Mill Valley Temperature Statistics

December Temperature

Novato / Gnoss Field (16.2 miles)

  • Lowest 2 December, 2025

    37.4 °F

  • Average December

    46.2 °F

  • Highest 3 December, 2025

    71.6 °F

Climate (2020–Present)

Novato / Gnoss Field (16.2 miles)

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  • Average Low 2020–2025

    46.2 °F

  • Average 2020–2025

    57.4 °F

  • Average High 2020–2025

    72.3 °F
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