Osbourne - surf spot statistics

Best Surf Season (October – March)

The heart of winter delivers the most consistent and powerful swell to Osbourne. Average wave heights hover around 1.6–1.7 m with periods often reaching into the 8.6–8.7 s range, thanks to frequent extratropical cyclones tracking across the North Atlantic. These systems generate significant long‑period groundswell that can light up the east‑southeast facing beach. However, the offshore wind window (W‑NNW) is only open about 25 % of the time, so quality sessions are a game of patience. When a cold front passes and the wind swings west, the waves become clean, hollow and absolutely pumping.

Fair Surf Season (April – June & September)

Spring and early autumn offer a trade‑off: smaller but more rideable waves and a slightly higher chance of offshore breezes. April averages 1.4 m at 8.4 s, while September sees 1.2 m at 8.5 s. Wind‑favorable conditions occur 28–37 % of the time, making these months the most reliable for fun, rippable waves. Swell direction shifts south as the jet stream weakens, and while the dominant S‑SSW energy isn’t ideal, it still produces workable lines. Longboarders and shortboarders alike find plenty of fun‑sized surf.

Low Surf Season (July – August)

Summer brings the smallest surf of the year. Average wave heights drop to just 1.0 m with periods of 7.2–7.7 s – often choppy and groveling. Although the offshore wind clock ticks up to 41–45 % (the highest of any season), the swell is simply too weak to light up the spot in a meaningful way. Occasional tropical systems can inject a rare pulse of energy, but most days are best reserved for a paddle or a flat‑day session.

April: Spring Awakening

April sees a drop in average height to 1.4 m and period to 8.4 s, but the swell becomes more rideable. Dominant directions shift even further south: SSW (19.6 %) and S (17.2 %) rule, while optimal E‑SSE still accounts for 38.1 % of the wave energy – a notable bump from winter. Offshore wind frequency ticks up to 28 %, with a broader spread from W (7.0 %) to NNW (6.3 %). The result is a more consistent mix of fun‑sized waves (1‑1.5 m) and occasional 1.5‑2 m pulses. Longboards and step‑ups are the call. Spring storms are less frequent but can still deliver a few solid days.