Joint Base Lewis McChord

What is the climate like in Joint Base Lewis McChord?

The best time to visit Joint Base Lewis McChord is typically July – August, with trip comfort peaking in July (8.7/10). Joint Base Lewis McChord is warmest in August, when daily highs average 78°F (25°C), and coolest in February, when lows fall to about 36°F (2°C). The wettest month is typically December and the driest is July; the year sees roughly 55 in (1399 mm) of precipitation.

• Best time to visitJuly – August — comfort peaks in July (8.7/10)
• Warmest monthAugust — average high 78°F (25°C)
• Coolest monthFebruary — average low 36°F (2°C)
• Wettest monthDecember (8.5 in (216 mm))
• Driest monthJuly (0.5 in (12 mm))
• Annual precipitation55 in (1399 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromTacoma Mcchord AFB, 8 km away (1946-2026)