Third Napa Slough Weather Forecast

    • 53
    • 70

    Increasing Clouds

    • 51
    • 73

    Partly Sunny

    • 52
    • 77

    Mostly Sunny

    • 53
    • 78

    Mostly Sunny

    • 53
    • 79

    Mostly Sunny

    • 54
    • 81

    Mostly Sunny

Today 19 Jun North Bay Interior Valleys

Mostly cloudy late in the morning then becoming partly cloudy. Highs in the lower 60s to mid 70s. Southwest Winds 10 to 20 Mph.

Tonight 19 Jun North Bay Interior Valleys

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

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Third Napa Slough Temperature Statistics

June Temperature

Napa, Napa County Airport (6.2 miles)

  • Lowest 7 June, 2026

    45.6 °F

  • Average June

    66.6 °F

  • Highest 11 June, 2026

    96.7 °F

Climate (2021–2026)

Napa, Napa County Airport (6.2 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.4 °F

  • Average High 2021–2026

    70.2 °F
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