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Climate almanac

Willowbrook

Illinois, United States · 41.77°, -87.94°

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What is the weather like in Willowbrook in September?

In September, Willowbrook is typically 77°F (25°C) during the day and 59°F (15°C) at night. The month brings about 3.0 in (76 mm) of precipitation in total.

  • Average high77°F (25°C)
  • Average low59°F (15°C)
  • Precipitation3.0 in (76 mm)
  • Clear or mostly clear days13
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)