Climate almanac
Downers Grove
Illinois, United States · 41.81°, -88.01°
What is the climate like in Downers Grove?
The best time to visit Downers Grove is typically August – September, with trip comfort peaking in September (7.1/10). Downers Grove is warmest in July, when daily highs average 84°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 42 in (1073 mm) of precipitation.
- Best time to visitAugust – September — comfort peaks in September (7.1/10)
- Warmest monthJuly — average high 84°F (29°C)
- Coolest monthJanuary — average low 21°F (-6°C)
- Wettest monthMay (4.9 in (125 mm))
- Driest monthNovember (2.2 in (56 mm))
- Annual precipitation42 in (1073 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromLisle - Morton Arboretum, 5 km away (2007-2026)