Glen Ellyn

What is the climate like in Glen Ellyn?

The best time to visit Glen Ellyn is typically August – September, with trip comfort peaking in September (7.1/10). Glen Ellyn is warmest in July, when daily highs average 83°F (28°C), and coolest in January, when lows fall to about 20°F (-6°C). The wettest month is typically May and the driest is February; the year sees roughly 41 in (1038 mm) of precipitation.

• Best time to visitAugust – September — comfort peaks in September (7.1/10)
• Warmest monthJuly — average high 83°F (28°C)
• Coolest monthJanuary — average low 20°F (-6°C)
• Wettest monthMay (5.0 in (127 mm))
• Driest monthFebruary (2.0 in (52 mm))
• Annual precipitation41 in (1038 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromAurora Water, 23 km away (1893-2026)