Hermiston

What is the climate like in Hermiston?

The best time to visit Hermiston is typically April – October, with trip comfort peaking in July (9.0/10). Hermiston is warmest in July, when daily highs average 96°F (35°C), and coolest in January, when lows fall to about 31°F (-1°C). The wettest month is typically December and the driest is July; the year sees roughly 13 in (329 mm) of precipitation.

• Best time to visitApril – October — comfort peaks in July (9.0/10)
• Warmest monthJuly — average high 96°F (35°C)
• Coolest monthJanuary — average low 31°F (-1°C)
• Wettest monthDecember (1.9 in (48 mm))
• Driest monthJuly (0.1 in (2 mm))
• Annual precipitation13 in (329 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromHermiston Muni AP, 3 km away (1998-2026)