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.

July at this spot offers relatively small but consistent surf, with an average swell height of 0.7m and a decent period of 7.4s, providing rideable waves, though mostly on the weaker side. The dominant swell directions are SSE, SE, and ESE, contributing the majority of waves in the 0.5-1.5m range, with peak occurrences around 1m. Wind conditions are favorable for surfing only 24% of the time, with the most common issue being onshore or cross-shore winds from the S, SSE, and SE, which can create chop. Light offshore winds (WNW to NNW) are rare but would provide cleaner conditions. Overall, expect small, mellow waves best suited for beginners or longboards, with occasional mid-range days when swell energy aligns properly. Wind luck will be key for quality sessions.