Climate almanac
Collinsville
Illinois, United States · 38.67°, -89.98°
What is the weather like in Collinsville in May?
In May, Collinsville is typically 78°F (25°C) during the day and 59°F (15°C) at night. The month brings about 5.2 in (133 mm) of precipitation in total.
- Average high78°F (25°C)
- Average low59°F (15°C)
- Precipitation5.2 in (133 mm)
- Clear or mostly clear days9
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)