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Climate almanac

Hillsborough

California, United States · 37.57°, -122.38°

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What is the weather like in Hillsborough in September?

In September, Hillsborough is typically 66°F (19°C) during the day and 58°F (15°C) at night. The month brings about 0.2 in (5 mm) of precipitation in total.

  • Average high66°F (19°C)
  • Average low58°F (15°C)
  • Precipitation0.2 in (5 mm)
  • Clear or mostly clear days11
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)