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Climate almanac

Mount Vernon

Illinois, United States · 38.32°, -88.90°

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What is the weather like in Mount Vernon in May?

In May, Mount Vernon is typically 78°F (25°C) during the day and 60°F (16°C) at night. The month brings about 5.5 in (140 mm) of precipitation in total.

  • Average high78°F (25°C)
  • Average low60°F (16°C)
  • Precipitation5.5 in (140 mm)
  • Clear or mostly clear days8
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)