Climate almanac
Oelwein
Iowa, United States · 42.67°, -91.91°
What is the climate like in Oelwein?
The best time to visit Oelwein is typically August – September, with trip comfort peaking in September (6.6/10). Oelwein is warmest in July, when daily highs average 83°F (28°C), and coolest in January, when lows fall to about 14°F (-10°C). The wettest month is typically May and the driest is February; the year sees roughly 41 in (1035 mm) of precipitation.
- Best time to visitAugust – September — comfort peaks in September (6.6/10)
- Warmest monthJuly — average high 83°F (28°C)
- Coolest monthJanuary — average low 14°F (-10°C)
- Wettest monthMay (5.7 in (144 mm))
- Driest monthFebruary (1.6 in (40 mm))
- Annual precipitation41 in (1035 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromOelwein 1e, 3 km away (2006-2026)