January in Pasadena averages a daily high of 20.2°C with nights around 8.5°C. Expect roughly 7.2 wet days totalling 112mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Pasadena is March–June.
Based on PASADENA, CA US (0.1km), 1995–2024. 30 years of January data.