Mahe - surf spot statistics

Best Surf Season (June - September)

The southwest monsoon cranks up the swell machine across the Indian Ocean, and Mahe feels the full force of those long-period WSW and W swells. Average wave heights climb to a solid 0.7-0.9m, with periods consistently in the 9-10 second range, offering plenty of punch. More importantly, the percentage of ideal offshore wind (from the E-ENE-NNE quadrant) peaks during these months, reaching 20-27%. While the prevailing flow is often cross-shore from the northwest, those windows of clean offshore breeze transform the lines into rippable, fun-sized waves. This is prime time for getting waves at Mahe — the combination of size, period, and wind align better than any other time of year.

Fair Surf Season (May & October)

These transitional months sit on the shoulders of the monsoon, offering a mix of conditions. May sees the first real uptick in swell energy as the monsoon begins to build, with average heights hitting 0.5m and periods reaching 9.6s. Ideal wind percentages jump to 14%, giving occasional clean sessions. October is the flip side — the monsoon is retreating, swell heights drop back to 0.4m, but long-period groundswell (10s average) can sneak in from the SW and WSW. However, ideal wind drops to just 8%, and the wind roses show a more variable, lighter pattern. You can score good waves if you pick your windows, but consistency is lower.

Low Surf Season (November - April)

From late autumn through early spring, Mahe is largely flat and wind-challenged. Average swell heights hover around a meager 0.3-0.4m, with the bulk of the energy coming from micro swell under 0.5m. Dominant swell directions are from the SW, WSW, and W, but the wave heights rarely break the 0.5m threshold, leaving you with at best groveling conditions. To make matters worse, the ideal offshore wind percentage drops to a dismal 1-3%. The wind roses show a strong presence of onshore or cross-shore flow from the SW to NW, directly degrading the wave quality. Even when a rare long-period swell from the Southern Ocean appears (periods hitting 10s+ in Nov-Dec), the lack of size and persistent poor wind make it a tough season for consistent surf.

October: Lull Before the Calm

October sees a sharp drop in average swell height to 0.4m, though the period remains long at 10.0s — a reminder that long-period groundswell can still arrive. The dominant swell directions shift toward SW (42.4%) and SSW (21.3%), which are still favorable for Mahe, but most of that energy is in the 0-0.5m range. A small fraction of WSW and W swell reaches 0.5-1m. Ideal offshore wind drops to 8%, and the wind rose becomes more variable with lighter speeds overall. Strong onshore events are rare, but so are clean offshore days. Surfable waves are limited to very infrequent long-period pulses that coincide with light or offshore wind. A transitional month with low expectations.