Waukegan

What is the climate like in Waukegan?

The best time to visit Waukegan is typically July – September, with trip comfort peaking in September (7.0/10). Waukegan is warmest in August, when daily highs average 76°F (24°C), and coolest in January, when lows fall to about 24°F (-4°C). The wettest month is typically October and the driest is February; the year sees roughly 44 in (1109 mm) of precipitation.

• Best time to visitJuly – September — comfort peaks in September (7.0/10)
• Warmest monthAugust — average high 76°F (24°C)
• Coolest monthJanuary — average low 24°F (-4°C)
• Wettest monthOctober (5.0 in (128 mm))
• Driest monthFebruary (2.7 in (70 mm))
• Annual precipitation44 in (1109 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromChicago Waukegan Rgnl AP, 7 km away (1999-2026)