Climate almanac
Eureka
Illinois, United States · 40.72°, -89.27°
What is the weather like in Eureka in October?
In October, Eureka is typically 67°F (19°C) during the day and 48°F (9°C) at night. The month brings about 3.9 in (99 mm) of precipitation in total. Snowfall averages about 0.6 in (14 mm) over the month.
- Average high67°F (19°C)
- Average low48°F (9°C)
- Precipitation3.9 in (99 mm)
- Clear or mostly clear days13
- Snowfall0.6 in (14 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)