Climate almanac
Bryn Mawr
Pennsylvania, United States · 40.30°, -80.09°
What is the weather like in Bryn Mawr in September?
In September, Bryn Mawr is typically 78°F (25°C) during the day and 59°F (15°C) at night. The month brings about 4.5 in (115 mm) of precipitation in total.
- Average high78°F (25°C)
- Average low59°F (15°C)
- Precipitation4.5 in (115 mm)
- Clear or mostly clear days11
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)