Mossel Bay - surf spot statistics

Best Surf Season (October - March)

During the Southern Hemisphere summer, Mossel Bay comes alive with the most favorable blend of conditions. From October through March, the region experiences a climatological peak in the frequency of offshore winds from the south (SSO, S, SSW, SW). This is when the wind is ideal roughly 40-49% of the time, allowing the dominant south and southwest swell to wrap into the north-facing bay with a surprisingly clean, groomed face. The average wave height sits at a solid 2.0m ( 6-7 ft) with a long period of 10.6-11.2 seconds, delivering a punchy, rideable wave that can be rippable on the better days. The lack of direct north swell is a limitation, but the southerly energy, when combined with these offshore winds, creates a fun and good surf zone, especially at the protected ends of the beach.

Fair Surf Season (April - May & September)

April, May, and September represent the transition periods, where the surf potential becomes a bit more fickle. The ideal wind frequency drops to 30-39%, meaning more days are plagued by onshore winds from the north and east that ruin the wave quality. The swell energy actually increases – heights average 2.1-2.3m with very powerful periods of 11.5-12.1 seconds – but these are almost exclusively from the south, making them more difficult to line up on this north-facing shore. When a strong low-pressure system stalls over the Southern Ocean, it can pump in a long-period, heavy groundswell, but the chance of glassy offshore conditions shrinks significantly. It is a season of averages and punchy waves if you score a rare window of light south wind.

Low Surf Season (June - August)

The winter months – June, July, and August – are the most challenging for surfing Mossel Bay. The swell is at its peak, with an average height of 2.3-2.4m and a very long period of 12.0-12.3 seconds – often producing epic, heavy energy out at sea. However, the wind is ideal only 23-28% of the time. The prevailing wind pattern shifts, with strong onshore flows from the north, northwest, and west dominating the region. This creates a messy, choppy surface that demolishes the wave quality. The south-oriented swell wraps in but is constantly battered by onshore winds, resulting in poor and unenjoyable surfing at most spots. Occasional brief windows with south winds can produce very powerful waves, but they are rare and highly unpredictable.

April: Cooler Waters, Bigger Swell

April sees a notable jump in average swell height to 2.1m and period to 11.6s – very powerful. The swell direction spreads a bit, with SSW (28.6%) and SW (12.4%) becoming more prominent, while S (16.7%) remains. The wind ideal percentage falls to 39%, as the onshore wind from the north and northeast (N, NNE, NE) increases to 8.1% combined. The dominant wind is still from E (19.3%) and WSW (11.3%), but the shift is clear. Good sessions become harder to find, but when the south wind blows, the bigger, longer-period swell delivers heavy, powerful waves.