Climate almanac

Geneseo

Illinois, United States · 41.45°, -90.15°

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What is the climate like in Geneseo?

The best time to visit Geneseo is typically June – September, with trip comfort peaking in September (7.1/10). Geneseo is warmest in July, when daily highs average 85°F (29°C), and coolest in January, when lows fall to about 19°F (-7°C). The wettest month is typically May and the driest is February; the year sees roughly 39 in (997 mm) of precipitation.

  • Best time to visitJune – September — comfort peaks in September (7.1/10)
  • Warmest monthJuly — average high 85°F (29°C)
  • Coolest monthJanuary — average low 19°F (-7°C)
  • Wettest monthMay (4.9 in (125 mm))
  • Driest monthFebruary (2.0 in (50 mm))
  • Annual precipitation39 in (997 mm)
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
  • Records fromGeneseo, 1 km away (1895-2026)