Climate almanac
Mill Plain
Washington, United States · 45.64°, -122.49°
What is the weather like in Mill Plain in September?
In September, Mill Plain is typically 76°F (24°C) during the day and 54°F (12°C) at night. The month brings about 3.2 in (80 mm) of precipitation in total.
- Average high76°F (24°C)
- Average low54°F (12°C)
- Precipitation3.2 in (80 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)