O'Fallon

What is the climate like in O'Fallon?

The best time to visit O'Fallon is typically August – October, with trip comfort peaking in September (7.0/10). O'Fallon is warmest in July, when daily highs average 89°F (32°C), and coolest in January, when lows fall to about 27°F (-3°C). The wettest month is typically April and the driest is December; the year sees roughly 47 in of precipitation.

• Best time to visitAugust – October — comfort peaks in September (7.0/10)
• Warmest monthJuly — average high 89°F (32°C)
• Coolest monthJanuary — average low 27°F (-3°C)
• Wettest monthApril (5.7 in)
• Driest monthDecember (2.8 in)
• Annual precipitation47 in