Climate almanac
Mendota
Illinois, United States · 41.55°, -89.12°
What is the climate like in Mendota?
The best time to visit Mendota is typically August – September, with trip comfort peaking in September (7.1/10). Mendota is warmest in July, when daily highs average 84°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 41 in (1032 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 19°F (-7°C)
- Wettest monthMay (5.0 in (128 mm))
- Driest monthFebruary (2.1 in (54 mm))
- Annual precipitation41 in (1032 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromPaw Paw 2s, 18 km away (1935-2026)