Mare Island Strait - Vallejo Weather Forecast

    • 44
    • 57

    Chance Rain Showers

    • 53
    • 54

    Chance Rain Showers

    • 53
    • 57

    Rain Showers

    • 55
    • 56

    Rain Showers

    • 53
    • 57

    Rain Showers

    • 49
    • 55

    Rain Showers Likely

    • 49
    • 50

    Rain Showers Likely

Today 17 Dec Carquinez Strait and Delta

Patchy fog until late afternoon. Mostly cloudy with a chance of rain Showers in the Morning, then partly cloudy in the afternoon. Not as cool. Highs 59 to 64. South Winds 10 to 15 Mph with Gusts to around 25 Mph.

Tonight 17 Dec Carquinez Strait and Delta

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Areas of fog late in the night. Lows around 43. West Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mare Island Strait - Vallejo Temperature Statistics

December Temperature

Napa, Napa County Airport (6.8 miles)

  • Lowest 2 December, 2025

    37 °F

  • Average December

    44.4 °F

  • Highest 3 December, 2025

    66 °F

Climate (2020–Present)

Napa, Napa County Airport (6.8 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    70.1 °F
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