Alcatraz Island Weather Forecast

    • 54
    • 58

    Increasing Clouds

    • 54
    • 60

    Breezy

    • 55
    • 62

    Mostly Sunny

    • 54
    • 60

    Partly Sunny

    • 54
    • 57

    Partly Sunny

    • 54
    • 59

    Mostly Sunny

Today 25 May San Francisco

Mostly cloudy in the morning then becoming partly cloudy. A slight chance of drizzle in the morning. Highs in the mid 50s to lower 60s. West Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 25 May San Francisco

Mostly cloudy. A slight chance of drizzle. Lows in the lower 50s. West Winds 10 to 20 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Alcatraz Island Temperature Statistics

May Temperature

Oakland, Metro Oakland International Airport (12.4 miles)

  • Lowest 16 May, 2026

    48.7 °F

  • Average May

    61.3 °F

  • Highest 18 May, 2026

    82.7 °F

Climate (2021–Present)

Oakland, Metro Oakland International Airport (12.4 miles)

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

  • Average Low 2021–2026

    51.1 °F

  • Average 2021–2026

    58.8 °F

  • Average High 2021–2026

    67.1 °F
Get WillyWeather+ to remove ads