Climate almanac
Mount Vernon
Washington, United States · 48.42°, -122.33°
What is the weather like in Mount Vernon in September?
In September, Mount Vernon is typically 67°F (19°C) during the day and 53°F (12°C) at night. The month brings about 4.1 in (104 mm) of precipitation in total.
- Average high67°F (19°C)
- Average low53°F (12°C)
- Precipitation4.1 in (104 mm)
- Clear or mostly clear days8
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)