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Climate almanac

Harrisburg

Illinois, United States · 37.74°, -88.54°

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What is the weather like in Harrisburg in September?

In September, Harrisburg is typically 83°F (29°C) during the day and 63°F (17°C) at night. The month brings about 2.9 in (73 mm) of precipitation in total.

  • Average high83°F (29°C)
  • Average low63°F (17°C)
  • Precipitation2.9 in (73 mm)
  • Clear or mostly clear days15
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)