Affton

What is the climate like in Affton?

The best time to visit Affton is typically August – October, with trip comfort peaking in September (7.1/10). Affton 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 46 in (1164 mm) of precipitation.

• Best time to visitAugust – October — comfort peaks in September (7.1/10)
• Warmest monthJuly — average high 89°F (32°C)
• Coolest monthJanuary — average low 27°F (-3°C)
• Wettest monthApril (5.4 in (136 mm))
• Driest monthDecember (2.6 in (66 mm))
• Annual precipitation46 in (1164 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromSt Louis Lambert Intl AP, 23 km away (1938-2026)