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Climate almanac

South Williamsport

Pennsylvania, United States · 41.23°, -77.00°

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What is the weather like in South Williamsport in September?

In September, South Williamsport is typically 74°F (24°C) during the day and 56°F (13°C) at night. The month brings about 4.3 in (110 mm) of precipitation in total.

  • Average high74°F (24°C)
  • Average low56°F (13°C)
  • Precipitation4.3 in (110 mm)
  • Clear or mostly clear days10
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)