Climate almanac
Eureka
Illinois, United States · 40.72°, -89.27°
What is the weather like in Eureka in July?
In July, Eureka is typically 85°F (29°C) during the day and 68°F (20°C) at night. The month brings about 4.3 in (109 mm) of precipitation in total.
- Average high85°F (29°C)
- Average low68°F (20°C)
- Precipitation4.3 in (109 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)