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Conditions at Johanna in September
September: Spring Swing and Heavy Westerlies
The storm track remains active as spring begins. Swell averages are still large at 2.9m (9-10ft), with period easing only slightly to 13.1s. The direction chart shows WSW (17.1%) and SW (16.2%) locked in a close battle, with W adding 3.6% and SSW 2.8%. The beach is still seeing serious Southern Ocean groundswell, but the synoptic pattern is starting to transition, and the character of the swell can be less predictable - some days lined-up and powerful, others stormy and closed-out.
Ideal wind slides to 26% as strong W/WNW flow becomes increasingly common. This is the month where onshore WSW/SW winds can really hurt quality after multiple fronts. Air and water are cold - averages of 12.6°C and 13.5°C respectively - and rainfall remains high at 3.27 mm/day. September is a giant but fickle month; pick a window with N/NE flow and you will be rewarded with some of the heaviest, most memorable surf of the year.
Average Spot conditions at Johanna in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Johanna during September. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Johanna for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Johanna for September. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Johanna.