Union City Weather Forecast

    • 52
    • 75

    Mostly Sunny

    • 51
    • 70

    Increasing Clouds

    • 53
    • 66

    Mostly Cloudy

    • 49
    • 61

    Partly Sunny

    • 49
    • 67

    Mostly Sunny

    • 51
    • 74

    Mostly Sunny

    • 52
    • 72

    Mostly Sunny

Today 30 Apr San Francisco Bay Shoreline

Mostly cloudy in the morning then becoming sunny. Highs in the 60s to upper 70s. Light Winds. Becoming northwest 5 to 15 Mph in the afternoon.

Tonight 30 Apr San Francisco Bay Shoreline

Mostly clear. Lows in the lower 50s. West Winds 5 to 10 Mph.

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  • Temperature Real-Time

Union City Temperature Statistics

April Temperature

Hayward, Hayward Air Terminal (6.2 miles)

  • Lowest 2 April, 2025

    43.6 °F

  • Average April

    59.1 °F

  • Highest 13 April, 2025

    80.7 °F

Climate (2020–Present)

Hayward, Hayward Air Terminal (6.2 miles)

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  • Average Low 2020–2025

    52.1 °F

  • Average 2020–2025

    59.5 °F

  • Average High 2020–2025

    69.2 °F
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