Saint Charles

What is the climate like in Saint Charles?

The best time to visit Saint Charles is typically October, the year's most comfortable month (6.8/10). Saint Charles is warmest in July, when daily highs average 88°F (31°C), and coolest in January, when lows fall to about 33°F (0°C). The wettest month is typically July and the driest is November; the year sees roughly 45 in (1144 mm) of precipitation.

• Best time to visitOctober — the year's comfort peak (6.8/10)
• Warmest monthJuly — average high 88°F (31°C)
• Coolest monthJanuary — average low 33°F (0°C)
• Wettest monthJuly (5.5 in (139 mm))
• Driest monthNovember (2.5 in (65 mm))
• Annual precipitation45 in (1144 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromCamp Springs Andrews AFB, 24 km away (1949-2026)