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.

Sumner Avenue in September offers surfable conditions, though they vary in quality. The average swell height is 0.9m with a decent period of 9.0s, providing relatively clean and rideable waves, especially in the 0.5–1.5m range, which dominates the swell distribution. The most consistent swell directions are from the SE, ESE, and E, contributing over 50% of the waves, with SE being the most prominent (23.34% in the 0.5–1m range). Larger waves (1.5m+) are less frequent but do occur, mostly from SE and ESE. Wind conditions are mixed—only 26% of the time is the wind ideal for surfing, typically lighter winds from the W to NW, which help clean up the waves. However, occasional stronger onshore winds from the NE and E can degrade conditions. Overall, September sees rideable waves, but surfers should time sessions around favorable wind directions for the best experience.