Climate almanac

Wheaton

Illinois, United States · 41.87°, -88.11°

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What is the climate like in Wheaton?

The best time to visit Wheaton is typically August – September, with trip comfort peaking in September (7.1/10). Wheaton 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 fromAurora Water, 19 km away (1893-2026)