December in Phoenix averages a daily high of 19.5°C with nights around 7.5°C. Expect roughly 3.8 wet days totalling 15.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Phoenix is November–March.
Based on PHOENIX AIRPORT, AZ US (6.9km), 1995–2024. 30 years of December data.