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Climate almanac

Grass Valley

California, United States · 39.22°, -121.06°

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What is the weather like in Grass Valley in September?

In September, Grass Valley is typically 85°F (30°C) during the day and 57°F (14°C) at night. The month brings about 1.0 in (25 mm) of precipitation in total.

  • Average high85°F (30°C)
  • Average low57°F (14°C)
  • Precipitation1.0 in (25 mm)
  • Clear or mostly clear days24
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)