December in Livermore averages a daily high of 14.6°C with nights around 4.2°C. Expect roughly 9.7 wet days totalling 73.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Livermore is April–June.
Based on LIVERMORE, CA US (1.5km), 1995–2024. 29 years of December data.