Cornerstone Weather Forecast

    • 56
    • 88

    Sunny

    • 53
    • 86

    Mostly Sunny

    • 50
    • 71

    Mostly Sunny

    • 50
    • 63

    Slight Chance Rain

    • 49
    • 63

    Chance Rain

    • 50
    • 65

    Slight Chance Rain

Today 16 Oct Southwestern Solano County Including Vallejo

Sunny. Highs 83 to 90. East Winds up to 10 Mph with Gusts to around 20 Mph.

Tonight 16 Oct Southwestern Solano County Including Vallejo

Clear. Lows around 57. Light Winds.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Cornerstone Temperature Statistics

October Temperature

Napa, Napa County Airport (7.5 miles)

  • Lowest 13 October, 2026

    39.9 °F

  • Average October

    66.1 °F

  • Highest 3 October, 2026

    96.7 °F

Climate (2021–2026)

Napa, Napa County Airport (7.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    58.6 °F

  • Average High 2021–2026

    70.3 °F
Get WillyWeather+ to remove ads