San Onofre State Beach - surf spot statistics

San Onofre State Beach offers consistent surf conditions year-round, with some months standing out as particularly favorable for surfers. The best time to surf here is generally from April to September, when ground swell dominates (90-96% of the time) and wind swell remains minimal (2-6%). During this period, wave quality is reliable, with mean swell sizes hovering around 0.8-0.9m, providing manageable and rideable waves. The downside is that onshore winds (bad conditions) are frequent, peaking at 77% in May, making early mornings or late evenings ideal when winds are lighter. September and October bring slightly improved wind conditions (36-38% good winds) while maintaining strong ground swell presence (89-95%), making them prime months for cleaner waves. Winter months (November-February) see a drop in ground swell consistency (60-74%) and increased no-swell days (16-31%), though February still maintains decent swell size (0.8m). Wind conditions remain challenging year-round, but the fall transition (September-October) offers the best compromise between swell consistency and cleaner winds. For surfers prioritizing wave regularity over wind conditions, late spring to early fall (May-August) is optimal, while those seeking fewer crowds and a chance for better winds should target early fall.

January at San Onofre State Beach offers generally mellow conditions with an average swell height of 0.7m and a decently long period of 14.1s, which helps maintain clean and rideable waves. The swell predominantly comes from SSW to W directions, with the most favorable waves (1-2m range) arriving from WSW and SW at 21.5% and 13.3% frequency, respectively. Larger sets (over 1.5m) are less common but do occur, mostly from the WSW, W, and SW sectors. Wind conditions are workable but not perfect—while 35% of the time the wind is ideal for surfing, onshore flow can occasionally disrupt the otherwise smooth surf, particularly from the W and WNW when speeds exceed 20kph (7.5% combined). Overall, January is a decent month for longboarders and those seeking more relaxed sessions, though bigger days are infrequent. Patience and timing are key to scoring the best conditions.