Climate almanac
Geneseo
Illinois, United States · 41.45°, -90.15°
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)