Napa

What is the climate like in Napa?

The best time to visit Napa is typically April – October, with trip comfort peaking in July (9.4/10). Napa is warmest in August, when daily highs average 87°F (30°C), and coolest in December, when lows fall to about 43°F (6°C). The wettest month is typically January and the driest is July; the year sees roughly 23 in (589 mm) of precipitation.

• Best time to visitApril – October — comfort peaks in July (9.4/10)
• Warmest monthAugust — average high 87°F (30°C)
• Coolest monthDecember — average low 43°F (6°C)
• Wettest monthJanuary (5.2 in (131 mm))
• Driest monthJuly (0.0 in (0 mm))
• Annual precipitation23 in (589 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromNapa State Hospital, 3 km away (1893-2026)