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Climate almanac

Union City

California, United States · 37.60°, -122.02°

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What is the weather like in Union City in September?

In September, Union City is typically 81°F (27°C) during the day and 60°F (15°C) at night. The month brings about 0.2 in (5 mm) of precipitation in total.

  • Average high81°F (27°C)
  • Average low60°F (15°C)
  • Precipitation0.2 in (5 mm)
  • Clear or mostly clear days19
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)