Eureka

What is the climate like in Eureka?

The best time to visit Eureka is typically August – September, with trip comfort peaking in September (7.5/10). Eureka is warmest in July, when daily highs average 85°F (29°C), and coolest in January, when lows fall to about 21°F (-6°C). The wettest month is typically May and the driest is November; the year sees roughly 41 in (1048 mm) of precipitation.

• Best time to visitAugust – September — comfort peaks in September (7.5/10)
• Warmest monthJuly — average high 85°F (29°C)
• Coolest monthJanuary — average low 21°F (-6°C)
• Wettest monthMay (5.0 in (128 mm))
• Driest monthNovember (2.2 in (55 mm))
• Annual precipitation41 in (1048 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromCongerville 2nw, 12 km away (1996-2026)