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.

June at Lower Trestles typically offers consistent but smaller conditions, with an average swell height of 0.8m and a respectable period of 15.2s, indicating clean, well-spaced waves. The swell direction is predominantly from the SSW (59.3% of waves in the 0.5-1m range, 8.2% in 1-1.5m), which aligns well with the break. SW and S swells also contribute, though larger waves (>1.5m) are rare. Wind conditions are hit-or-miss—only 26% of the time are they ideal (light and offshore). WSW and W winds are most common (6.4% and 7.5% at 0-10kph, but often strengthen to 10-20kph), which can create onshore chop. Mornings typically offer the cleanest sessions before winds pick up. While not a big-wave month, June delivers rideable, user-friendly waves for high-performance surfing, especially when winds cooperate. Expect plenty of knee-to-chest-high days with the occasional shoulder-high sets on better SSW pulses.