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.

In June, Sumner Avenue offers relatively small but surfable conditions, with an average swell height of 0.7m and a decent period of 7.2s, providing some energy for riding. The predominant swell direction is from the southeast (SE, SSE), accounting for a significant portion of waves, especially in the 0.5-1.5m range. However, larger waves (over 1.5m) are rare, limiting opportunities for more advanced surfers seeking powerful breaks. Wind conditions are favorable for surfing only 24% of the time, with the best scenario being light to moderate offshore or cross-offshore winds (typically from the west-northwest or similar directions). Unfortunately, stronger onshore winds from the south and southeast are more frequent, which can degrade wave quality. Overall, June tends to be a mixed month—small but rideable waves for beginners and longboarders, though seasoned surfers may find it lacking in size and consistency. Checking daily forecasts is key, as the best sessions will depend on wind alignment and occasional pulses of slightly bigger swell.