Lower Trestles - surf spot statistics

Lower Trestles is a consistent surf spot with predominantly ground swell year-round, though the optimal conditions vary across seasons. The best months for surfing are typically from March through September, when ground swell occurrence is highest (82–96%) and swell size averages around 0.8–0.9m. However, wind conditions play a crucial role, with onshore winds (bad conditions) dominating most of the year. The most favorable wind conditions are found in September and October, when good wind percentages reach 40%, though even then, offshore winds remain a minority. Late spring and early summer (May–June) see the strongest swells (0.9m), but wind quality drops significantly (only 26% favorable). Winter months (November–February) offer slightly better wind ratios (32–36% good), but swell consistency and size decrease, with more no-swell or wind-swell days. Ultimately, September and October strike the best balance, combining reliable ground swells (89–95%) and the least unfavorable winds (40% good), while still maintaining decent swell heights around 0.7–0.8m. For surfers prioritizing clean conditions over raw swell size, these transitional months are the most dependable.

May at Lower Trestles typically offers decent surf conditions with an average swell height of 0.9m and a solid swell period of 15.1s, indicating consistent, well-spaced waves. The swell direction is predominantly from the SSW (54.4% of waves in the 0.5-1m range) and SW (14.03% in the 0.5-1m range), which aligns well with the break’s orientation, producing clean, rideable waves. While the majority of waves fall in the 0.5-1.5m range (over 70%), larger swells (1.5-2.5m) are rare but occasionally present, mostly from WSW and W directions. Wind conditions are a mixed bag—only 26% of the time is it ideal (light offshore or cross-offshore), with the most favorable winds coming from the NE to E. However, afternoon onshore WSW winds (8.09% at 10-20kph, 2.99% at 20-30kph) can disrupt the surface, particularly later in the day. Overall, May delivers fun, workable waves, especially in the mornings before winds pick up, with the best sessions occurring when SSW swells combine with light E or NE breezes.