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Climate almanac

Princeton

Illinois, United States · 41.37°, -89.46°

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What is the weather like in Princeton in September?

In September, Princeton is typically 80°F (26°C) during the day and 59°F (15°C) at night. The month brings about 2.8 in (72 mm) of precipitation in total.

  • Average high80°F (26°C)
  • Average low59°F (15°C)
  • Precipitation2.8 in (72 mm)
  • Clear or mostly clear days14
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)