Supertubes - surf spot statistics

Best Surf Season (March - May)

As autumn settles in, the Indian Ocean begins to stir with a steady rhythm. Average swell heights climb from 1.9m to 2.3m, and the dominant long-period groundswell (12-13s) pulses with power. The most promising window emerges in April, when ideal offshore winds blow 29% of the time—the year's peak. Storms tracking across the Southern Ocean send consistent SW swell towards the NW-facing coast, while high-pressure systems stall offshore and deliver clean, glassy conditions. This is the sweet spot: solid, rippable waves with light winds from the S to SW quadrant. Expect plenty of 1.5-2.5m sets that barrel down the reef.

Fair Surf Season (June - August & September - November)

Winter roars with maximum energy—average swell heights hit 2.6-2.8m and periods hover around 13s, signaling powerful groundswell. The Southern Ocean is a storm factory, churning out XL swells (some exceeding 2.5m) that wrap into the bay. However, the trade-off comes in the form of less reliable offshore winds, with ideal conditions dropping to just 17-18% of the time in mid-winter. Frequent frontal passages bring gusty NW to SW winds, often mixing up the faces. Spring offers a gradual improvement: by October, the wind cleans up (21% ideal) and swell sizes remain solid at 2.2m. September through November provide a good mix of size and occasional windows of perfection, but you'll need to pick your days carefully.

Low Surf Season (December - February)

Summer settles over the region, and the swell machine winds down. Averages dip to 1.8-1.9m, with periods still respectable at 11.8-11.9s (mostly due to distant storm remnants). The dominant swell direction stays in the SW quadrant, but the energy is less consistent. Light offshore breezes from the S to SSE quadrant occur around 17-18% of the time—similar to mid-winter but with much smaller wave heights. The result is a lot of days with fun-sized, groveling waves under 1m. Occasional pulses of 1.5m+ swell can arrive, but the general vibe is relaxed, making this the go-to season for longboarders and those seeking mellow sessions.

September: Spring's Fresh Start

September brings the first signs of spring. Average swell drops slightly to 2.6m, period remains long at 13.2s, and ideal offshore winds bounce back to 20% of the time. Swell from SW (28.4%) and WSW (15.9%) still dominate, but the NW quadrant begins to fade (0.9% WNW, 0.2% NW). The most notable change is in the wind rose: the onshore W-NW flow weakens, and S to SSE winds become more frequent, offering cleaner conditions. In September, you can often find storms still delivering powerful southwest swell, while high pressure builds to the south and ushers in light S winds. The combo produces clean, 1.5-2.5m sets with long-period energy. It's a month for picking smaller waves inside, or hunting the outside bombs when the conditions align.