Fort Irwin

What is the climate like in Fort Irwin?

The best time to visit Fort Irwin is typically February – November, with trip comfort peaking in September (9.2/10). Fort Irwin is warmest in July, when daily highs average 102°F (39°C), and coolest in December, when lows fall to about 38°F (3°C). The wettest month is typically January and the driest is June; the year sees roughly 4.7 in (120 mm) of precipitation.

• Best time to visitFebruary – November — comfort peaks in September (9.2/10)
• Warmest monthJuly — average high 102°F (39°C)
• Coolest monthDecember — average low 38°F (3°C)
• Wettest monthJanuary (1.0 in (25 mm))
• Driest monthJune (0.0 in (1 mm))
• Annual precipitation4.7 in (120 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromBarstow-daggett AP, 46 km away (1943-2026)