Climate almanac
Semily
Liberec Region, Czechia · 50.60°, 15.34°
What is the weather like in Semily in September?
In September, Semily is typically 67°F (20°C) during the day and 51°F (10°C) at night. The month brings about 2.7 in (69 mm) of precipitation in total.
- Average high67°F (20°C)
- Average low51°F (10°C)
- Precipitation2.7 in (69 mm)
- Clear or mostly clear days9
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)