Climate almanac
Harrisburg
Illinois, United States · 37.74°, -88.54°
What is the weather like in Harrisburg in May?
In May, Harrisburg is typically 78°F (25°C) during the day and 60°F (16°C) at night. The month brings about 4.8 in (121 mm) of precipitation in total.
- Average high78°F (25°C)
- Average low60°F (16°C)
- Precipitation4.8 in (121 mm)
- Clear or mostly clear days7
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)