Climate almanac
Alton
Illinois, United States · 38.89°, -90.18°
What is the weather like in Alton in July?
In July, Alton is typically 88°F (31°C) during the day and 71°F (22°C) at night. The month brings about 4.6 in (116 mm) of precipitation in total.
- Average high88°F (31°C)
- Average low71°F (22°C)
- Precipitation4.6 in (116 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)