December in Palo Alto averages a daily high of 15.2°C with nights around 4.9°C. Expect roughly 9.7 wet days totalling 103.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Palo Alto is April–October.
Based on REDWOOD CITY, CA US (9.3km), 1995–2024. 27 years of December data.