Union City Weather Forecast

    • 42
    • 62

    Mostly Sunny

    • 45
    • 62

    Partly Sunny

    • 43
    • 59

    Partly Sunny

    • 42
    • 66

    Mostly Sunny

    • 42
    • 65

    Mostly Sunny

    • 43
    • 64

    Mostly Sunny

Today 4 Dec San Francisco Bay Shoreline

Partly cloudy in the morning then becoming sunny. Highs in the mid 60s. Northwest Winds up to 5 Mph.

Tonight 4 Dec San Francisco Bay Shoreline

Mostly clear. Lows in the lower 40s. Northwest Winds around 5 Mph. Becoming southeast after midnight.

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Union City Temperature Statistics

December Temperature

Hayward, Hayward Air Terminal (6.2 miles)

  • Lowest 1 December, 2020

    42.1 °F
  • Average December

    51.4 °F
  • Highest 2 December, 2020

    64.9 °F

Climate (2010–Present)

Hayward, Hayward Air Terminal (6.2 miles)

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  • Average Low 2010–Present

    52.7 °F
  • Average 2010–Present

    59.7 °F
  • Average High 2010–Present

    69.2 °F
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