Nuevo Vallarta benefits from consistent ground swells year-round, with the highest reliability from January to May when ground swells dominate 92-94% of the time and average swell heights hover around 0.9m. During these months, wind conditions are also most favorable, particularly in January (69% good winds), December (68%), and February (64%), making them the prime window for surfers seeking clean, rideable waves. The swell consistency drops slightly from June to September, with ground swells dipping to 77-80% and no-swell days increasing, especially in July-August when wind conditions worsen (only 46-47% favorable). However, September brings a slight rebound in swell quality (79% ground swells, 0.9m) before improving further in October (86%). Late autumn through early winter (October-December) offers a solid compromise—decent swell consistency (86-89%) and improving winds (58-68% good), though with marginally smaller waves (0.7-0.8m). For ideal surf, prioritize January to February when swell reliability, size, and offshore winds align best, while May onward sees increasing onshore winds and lower consistency, particularly in midsummer (June-August). Advanced surfers may still find workable waves in shoulder seasons (October, April), but the winter months deliver the most optimal balance of power and conditions.