Mill Valley Weather Forecast

    • 51
    • 65

    Increasing Clouds

    • 52
    • 69

    Partly Sunny

    • 54
    • 70

    Partly Sunny

    • 54
    • 72

    Patchy Fog

    • 55
    • 74

    Patchy Fog

    • 54
    • 73

    Partly Sunny

Today 20 Jun North Bay Interior Valleys

Mostly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the mid 60s to lower 80s. West Winds 5 to 10 Mph. Becoming southwest 10 to 20 Mph in the afternoon.

Tonight 20 Jun North Bay Interior Valleys

Mostly clear in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the upper 40s to mid 50s. Southwest Winds 10 to 20 Mph. Becoming 5 to 10 Mph after midnight.

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Mill Valley Temperature Statistics

June Temperature

Novato / Gnoss Field (16.2 miles)

  • Lowest 7 June, 2026

    46.4 °F

  • Average June

    66 °F

  • Highest 11 June, 2026

    100.4 °F

Climate (2021–2026)

Novato / Gnoss Field (16.2 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    57.7 °F

  • Average High 2021–2026

    72.5 °F
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