Climate almanac
Washington
Iowa, United States · 41.30°, -91.69°
What is the climate like in Washington?
The best time to visit Washington is typically May – September, with trip comfort peaking in August (7.1/10). Washington is warmest in July, when daily highs average 86°F (30°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 (975 mm) of precipitation.
- Best time to visitMay – September — comfort peaks in August (7.1/10)
- Warmest monthJuly — average high 86°F (30°C)
- Coolest monthJanuary — average low 18°F (-8°C)
- Wettest monthMay (4.8 in (123 mm))
- Driest monthFebruary (1.8 in (47 mm))
- Annual precipitation38 in (975 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromWashington, 2 km away (1893-2026)