Climate almanac
Siena
Tuscany, Italy · 43.32°, 11.33°
What is the weather like in Siena in September?
In September, Siena is typically 78°F (26°C) during the day and 59°F (15°C) at night. The month brings about 3.8 in (96 mm) of precipitation in total.
- Average high78°F (26°C)
- Average low59°F (15°C)
- Precipitation3.8 in (96 mm)
- Clear or mostly clear days14
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)