March in Hayward averages a daily high of 17.6°C with nights around 8.4°C. Expect roughly 9.7 wet days totalling 57.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Hayward is May–October.
Based on HAYWARD AIR TERMINAL, CA US (3.7km), 1995–2024. 25 years of March data.