Merrillville

What is the climate like in Merrillville?

The best time to visit Merrillville is typically August – September, with trip comfort peaking in September (7.2/10). Merrillville is warmest in July, when daily highs average 82°F (28°C), and coolest in January, when lows fall to about 23°F (-5°C). The wettest month is typically May and the driest is November; the year sees roughly 45 in (1131 mm) of precipitation.

• Best time to visitAugust – September — comfort peaks in September (7.2/10)
• Warmest monthJuly — average high 82°F (28°C)
• Coolest monthJanuary — average low 23°F (-5°C)
• Wettest monthMay (5.1 in (130 mm))
• Driest monthNovember (2.6 in (66 mm))
• Annual precipitation45 in (1131 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromLowell Wwtp, 25 km away (1963-2026)