September in Centennial averages a daily high of 25.8°C with nights around 9.6°C. Expect roughly 6 wet days totalling 32.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Centennial is May–June.
Based on DENVER CENTENNIAL AIRPORT, CO US (3.2km), 1995–2024. 27 years of September data.