Climate almanac
Portland
Maine, United States · 43.66°, -70.26°
What is the weather like in Portland in September?
In September, Portland is typically 67°F (19°C) during the day and 59°F (15°C) at night. The month brings about 3.1 in (78 mm) of precipitation in total.
- Average high67°F (19°C)
- Average low59°F (15°C)
- Precipitation3.1 in (78 mm)
- Clear or mostly clear days11
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)