Climate almanac
Rosemont
California, United States · 38.55°, -121.36°
What is the weather like in Rosemont in September?
In September, Rosemont is typically 90°F (32°C) during the day and 60°F (16°C) at night. The month brings about 0.2 in (6 mm) of precipitation in total.
- Average high90°F (32°C)
- Average low60°F (16°C)
- Precipitation0.2 in (6 mm)
- Clear or mostly clear days25
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)