Climate almanac
Monmouth
Illinois, US · 40.91°, -90.65°
What is the climate like in Monmouth?
The best time to visit Monmouth is typically May – September, with trip comfort peaking in September (7.3/10). Monmouth is warmest in July, when daily highs average 86°F (30°C), and coolest in January, when lows fall to about 20°F (-7°C). The wettest month is typically May and the driest is November; the year sees roughly 39 in of precipitation.
- Best time to visitMay – September — comfort peaks in September (7.3/10)
- Warmest monthJuly — average high 86°F (30°C)
- Coolest monthJanuary — average low 20°F (-7°C)
- Wettest monthMay (4.9 in)
- Driest monthNovember (2.0 in)
- Annual precipitation39 in