Bethalto

What is the climate like in Bethalto?

The best time to visit Bethalto is typically September – October, with trip comfort peaking in September (7.2/10). Bethalto is warmest in July, when daily highs average 88°F (31°C), and coolest in January, when lows fall to about 25°F (-4°C). The wettest month is typically May and the driest is December; the year sees roughly 45 in (1143 mm) of precipitation.

• Best time to visitSeptember – October — comfort peaks in September (7.2/10)
• Warmest monthJuly — average high 88°F (31°C)
• Coolest monthJanuary — average low 25°F (-4°C)
• Wettest monthMay (5.2 in (131 mm))
• Driest monthDecember (2.3 in (59 mm))
• Annual precipitation45 in (1143 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromAlton - Melvin Price L&d, 10 km away (1943-2026)