Mare Island Shoreline Heritage Preserve Weather Forecast
- 44
- 52
Decreasing Clouds
- 45
- 56
Partly Sunny
- 45
- 59
Partly Sunny
- 44
- 58
Partly Sunny
- 47
- 57
Partly Sunny
- 48
- 57
Mostly Cloudy
Today 9 Dec Carquinez Strait and Delta
Widespread fog. Locally dense early in the morning. Haze until late afternoon. Areas of fog late in the Morning, then patchy fog early in the afternoon. Mostly cloudy. Highs around 47. Light Winds.
Tonight 9 Dec Carquinez Strait and Delta
Mostly cloudy. Lows around 42. Light Winds.
Mare Island Shoreline Heritage Preserve Temperature Statistics
December Temperature
Napa, Napa County Airport (8.7 miles)
Lowest 2 December, 2025
37 °FAverage December
45.9 °FHighest 3 December, 2025
66 °F
Climate (2020–Present)
Napa, Napa County Airport (8.7 miles)
Average Low 2020–2025
47 °FAverage 2020–2025
58.1 °FAverage High 2020–2025
70.1 °F