February in Sunnyvale averages a daily high of 16.5°C with nights around 6.8°C. Expect roughly 11 wet days totalling 66.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sunnyvale is May–October.
Based on MOFFETT FEDERAL AIRFIELD, CA US (4.2km), 1995–2024. 20 years of February data.