Castro Valley Weather Forecast

    • 44
    • 57

    Rain Showers

    • 45
    • 58

    Rain Showers Likely

    • 47
    • 63

    Partly Sunny

    • 50
    • 68

    Mostly Sunny

    • 51
    • 70

    Mostly Sunny

    • 51
    • 70

    Mostly Sunny

Today 5 Apr San Francisco Bay Shoreline

Showers in the Morning, then a chance of Showers and a slight chance of Thunderstorms in the afternoon. Some Thunderstorms may produce small hail in the afternoon. Highs in the upper 50s. Southwest Winds 10 to 20 Mph.

Tonight 5 Apr San Francisco Bay Shoreline

Mostly cloudy. A chance of Showers. Lows in the mid 40s. West Winds 5 to 10 Mph. Becoming north after midnight.

Graph Plots Open in Graphs
  • Temperature Forecast NOAA

  • Temperature Real-Time

Castro Valley Temperature Statistics

April Temperature

Hayward, Hayward Air Terminal (3.1 miles)

  • Lowest 2 April, 2020

    42.1 °F
  • Average April

    53.3 °F
  • Highest 2 April, 2020

    64 °F

Climate (2010–Present)

Hayward, Hayward Air Terminal (3.1 miles)

Take a look at our website widgetsAvailable free! Find Out More
  • Average Low 2010–Present

    52 °F
  • Average 2010–Present

    58.9 °F
  • Average High 2010–Present

    68.1 °F
Get an account to remove ads