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Climate almanac

Saint Charles

Missouri, United States · 38.78°, -90.48°

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What is the weather like in Saint Charles in September?

In September, Saint Charles is typically 82°F (28°C) during the day and 62°F (16°C) at night. The month brings about 2.8 in (72 mm) of precipitation in total.

  • Average high82°F (28°C)
  • Average low62°F (16°C)
  • Precipitation2.8 in (72 mm)
  • Clear or mostly clear days15
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)