Union City Weather Forecast

    • 53
    • 77

    Increasing Clouds

    • 49
    • 80

    Partly Sunny

    • 51
    • 78

    Mostly Sunny

    • 54
    • 81

    Partly Sunny

    • 53
    • 74

    Chance Rain

    • 50
    • 66

    Rain Likely

Today 26 Mar San Francisco Bay Shoreline

Partly cloudy. Highs in the 70s to lower 80s. North Winds 5 to 10 Mph.

Tonight 26 Mar San Francisco Bay Shoreline

Mostly cloudy. Lows in the mid 50s. Northwest Winds 5 to 10 Mph in the evening. Becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Union City Temperature Statistics

March Temperature

Hayward, Hayward Air Terminal (6.2 miles)

  • Lowest 5 March, 2026

    44.7 °F

  • Average March

    62.8 °F

  • Highest 20 March, 2026

    88.6 °F

Climate (2021–Present)

Hayward, Hayward Air Terminal (6.2 miles)

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  • Average Low 2021–2026

    52.2 °F

  • Average 2021–2026

    59.5 °F

  • Average High 2021–2026

    69 °F
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