Walla Walla

What is the climate like in Walla Walla?

The best time to visit Walla Walla is typically June – September, with trip comfort peaking in July (9.1/10). Walla Walla is warmest in July, when daily highs average 88°F (31°C), and coolest in January, when lows fall to about 29°F (-1°C). The wettest month is typically December and the driest is July; the year sees roughly 27 in (683 mm) of precipitation.

• Best time to visitJune – September — comfort peaks in July (9.1/10)
• Warmest monthJuly — average high 88°F (31°C)
• Coolest monthJanuary — average low 29°F (-1°C)
• Wettest monthDecember (4.0 in (100 mm))
• Driest monthJuly (0.2 in (4 mm))
• Annual precipitation27 in (683 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromWalla Walla Rgnl AP, 6 km away (1949-2026)