Carquinez Strait - Mare Island Strait Entrance Weather Forecast

    • 47
    • 57

    Decreasing Clouds

    • 47
    • 61

    Mostly Cloudy

    • 55
    • 62

    Rain

    • 54
    • 58

    Rain

    • 51
    • 60

    Chance Rain

    • 51
    • 63

    Slight Chance Rain

Today 21 Feb Carquinez Strait and Delta

Mostly cloudy in the morning then becoming mostly sunny. Areas of frost early in the morning. Highs around 58. Southeast Winds up to 15 Mph.

Tonight 21 Feb Carquinez Strait and Delta

Mostly clear. Lows 37 to 43. Southeast Winds around 10 Mph with Gusts to around 20 Mph.

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Carquinez Strait - Mare Island Strait Entrance Temperature Statistics

February Temperature

Napa, Napa County Airport (9.3 miles)

  • Lowest 18 February, 2026

    32 °F

  • Average February

    51.4 °F

  • Highest 5 February, 2026

    71.7 °F

Climate (2021–Present)

Napa, Napa County Airport (9.3 miles)

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  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    70.1 °F
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