Johanna - surf spot statistics

Best Surf Season (May - September)

The Southern Ocean fires on all cylinders from May through September, delivering Johanna's most consistent and powerful swell. Average wave heights climb to the 2.6-2.9m range with periods hovering around 13 seconds – that's long period, groundswell territory. The dominant SW and WSW energy slams straight into this SSW-facing beach, producing hollow, rippable walls. Winter's strong frontal systems and deep low-pressure cells spinning up near Antarctica are the driving force. Offshore winds from the N, NNE, and NE occur roughly 30-35% of the time, often aligning with post-frontal high-pressure ridges. When it all comes together, you get pumping, firing surf with clean, offshore texture.

Fair Surf Season (April & October)

April and October serve as transitional windows where the swell quality remains high but consistency and wind reliability take a small step back. April still pumps out an average 2.5m swell at 12.7s, with a solid 33% offshore wind score – one of the best wind percentages of the year. October sees the swell start to wind down (2.7m, 12.6s) and the offshore wind window drops to 25%, but the predominant SW/WSW swell still offers plenty of fun, solid waves. These months can dish out epic days when a late-season storm aligns with a northerly breeze.

Low Surf Season (November - March)

The summer months from November through March bring the smallest average surf of the year (2.3-2.4m, 11.7-12.0s), though even these numbers are respectable by many standards. The real issue is the dominance of onshore winds from the S, SW, and WSW – the same directions that bring the swell – which create bumpy, chop-ridden conditions. Ideal offshore wind percentages drop to 22-25%. The swell still rolls in from the SW and WSW, but periods are shorter and the wave heights often sit in the 1-2m fun-size range. It's not a write-off: early mornings or days with a strong inland heat trough can produce brief offshore windows, but overall consistency and quality take a seasonal dip.

May: Winter's Caress

May is when Johanna truly comes into its own. Average swell height climbs to 2.6m, period to 12.9s, and offshore wind scores a seasonal best of 35%. SW and WSW combine for over 40% of the swell, delivering heavy, hollow waves. Long-period pulses (12-14s) are common, wrapping into the beach with power. The wind regime favors N, NNE, and NE directions – all offshore – while onshore SW and W winds drop to around 12%. The increased frequency of winter lows and fronts ensures a steady rhythm of swell events. This is the sweet spot: big, clean, and consistent. When a high-pressure system parks over the Bight, the offshore flow can last for days, allowing the beach to reel off epic sets.