Sumner Avenue - surf spot statistics

Sumner Avenue offers surfable conditions year-round, but the best months for consistent, quality waves are September through November. During September, ground swell presence increases significantly to 24%, the highest of the year, while wind swell remains dominant at 65%. Swell size averages a decent 0.9m, and wind conditions improve slightly with 26% good wind days—still somewhat marginal but better than most other months. October follows with a solid mix of ground (15%) and wind swells (66%), maintaining a 0.9m average swell size. While wind conditions degrade slightly (21% good winds), the swell consistency remains favorable. November sees a drop in ground swell (11%) but maintains similar conditions to October. Late summer and early fall (August-September) also show promise with August having a noticeable ground swell increase (12%) and September peaking in ground swell contribution. Winter months (December-February) bring more wind swell dominance (62–66%) and poor wind conditions (81–83% bad winds), though swell size stays around 0.8m. Spring and early summer (April-July) suffer from higher wind swell influence (77–84%) and generally unfavorable winds (76–80% bad). While smaller swells (0.7–0.9m) persist, the wind quality makes these months less ideal. Overall, September stands out as the best month for surf with the highest ground swell contribution and marginally better winds, followed by October and November for more balanced conditions.

October at Sumner Avenue offers surfable conditions with an average swell height of 0.9m and a decent period of 8.4s, indicating generally clean and organized waves. The swell direction is predominantly from the southeast to east-southeast, with the highest frequency of rideable waves (0.5–2.5m) coming from ESE, E, and SE directions. These swells often produce manageable chest- to head-high waves, occasionally reaching overhead on larger days. Wind conditions are somewhat mixed, with only 21% of the time being ideal (typically light offshore or sideshore winds). The most common wind directions are from the west to northwest, which can create onshore chop, but lighter winds from the northeast or east occasionally clean up the lineup. Overall, October provides a mix of smaller, user-friendly days and occasional punchy swells, best suited for intermediate to advanced surfers who can capitalize on the cleaner windows.