Ottumwa

What is the climate like in Ottumwa?

The best time to visit Ottumwa is typically May – September, with trip comfort peaking in August (7.0/10). Ottumwa is warmest in July, when daily highs average 87°F (31°C), and coolest in January, when lows fall to about 18°F (-8°C). The wettest month is typically May and the driest is February; the year sees roughly 38 in (973 mm) of precipitation.

• Best time to visitMay – September — comfort peaks in August (7.0/10)
• Warmest monthJuly — average high 87°F (31°C)
• Coolest monthJanuary — average low 18°F (-8°C)
• Wettest monthMay (4.9 in (124 mm))
• Driest monthFebruary (1.6 in (40 mm))
• Annual precipitation38 in (973 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromOttumwa Ind AP, 9 km away (1948-2026)