Climate almanac
Napa
California, United States · 38.30°, -122.29°
What is the weather like in Napa in September?
In September, Napa is typically 86°F (30°C) during the day and 57°F (14°C) at night. The month brings about 0.2 in (5 mm) of precipitation in total.
- Average high86°F (30°C)
- Average low57°F (14°C)
- Precipitation0.2 in (5 mm)
- Clear or mostly clear days23
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)