Climate almanac
Duncan
Oklahoma, United States · 34.50°, -97.96°
What is the weather like in Duncan in September?
In September, Duncan is typically 89°F (32°C) during the day and 67°F (20°C) at night. The month brings about 2.7 in (67 mm) of precipitation in total.
- Average high89°F (32°C)
- Average low67°F (20°C)
- Precipitation2.7 in (67 mm)
- Clear or mostly clear days19
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)