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.

August at Lower Trestles offers relatively small but clean conditions, with an average swell height of 0.8m and a solid period of 14.9s, indicating consistent, well-spaced waves. The swell predominantly comes from the SSW (62.97% of waves in the 0.5-1m range) and SW (17.28% in the same range), providing favorable directionality for this spot. Larger waves (1-1.5m) are less frequent but still possible, mainly from the SSW (6.14%) and SW (1.31%). Wind is favorable for surfing 35% of the time, with the most common light to moderate winds (0-20kph) coming from the W and WSW, which can occasionally create cross-shore or slightly onshore conditions. Stronger winds (20-30kph) are rare but tend to come from the WSW and W. Overall, August is a decent month for smaller, cleaner waves, with the best sessions occurring when winds stay light and swells hold in the SSW-SW window. Advanced surfers may find some fun, albeit smaller, waves, while beginners can enjoy manageable conditions.