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.

July at Lower Trestles is characterized by small but clean conditions, offering rideable waves for surfers who prioritize quality over size. The average swell height is 0.8m with a long period of 14.8s, indicating consistent, well-spaced waves. The dominant swell directions are SSW (63.64% of waves in the 0.5-1m range) and SW (16.37% in the same range), which align well with the break, producing clean, peeling waves. Larger swells (1.5m+) are rare, occurring only 0.18% of the time. Wind conditions are mixed: 29% of the time, winds are ideal (light or offshore), primarily from the ENE to SE, keeping surf clean. However, WSW and W winds, which are onshore, are more frequent (15-20% of the time) and can create choppy conditions, especially at higher speeds (10-20kph+). Overall, expect small, playful waves with occasional mid-period south swells and a fair chance of glassy mornings—best suited for performance surfing on smaller boards when conditions align. Wind luck will dictate session quality.