Climate almanac
Jacksonville
Illinois, United States · 39.73°, -90.23°
What is the weather like in Jacksonville in May?
In May, Jacksonville is typically 76°F (25°C) during the day and 57°F (14°C) at night. The month brings about 4.8 in (122 mm) of precipitation in total.
- Average high76°F (25°C)
- Average low57°F (14°C)
- Precipitation4.8 in (122 mm)
- Clear or mostly clear days9
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)