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Conditions at Johanna in August
August: The Biggest Averages of the Year
August sits at the statistical top of the swell calendar. Averages hit 2.9m (9-10ft) with a 13.2s period, giving Johanna the longest, most powerful swell of the year. The directional spectrum tilts further west - WSW 16.5%, SW 12.6%, W 5.2% - as deep lows roll eastward across the Great Australian Bight. Large chunks of the distribution sit above 1.5m (5ft), and the 8ft+ share is at its annual peak. This is not a month for the faint-hearted.
The wind dial is less forgiving. Ideal conditions slip to 28%, and while the N through ENE offshore quadrant still appears, strong W/WNW/NW flow now makes up a huge share of the wind rose, and WSW/SW onshores become a real threat. Rain is at its wettest at 3.77 mm/day, water temp is a cold 13.6°C, and average air temp is 12.4°C. The raw ingredients are incredible, but you need a synoptic window - generally a passing high pressure ridge delivering northerly flow - to unlock Johanna at its best.
Average Spot conditions at Johanna in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Johanna during August. 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 August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Johanna for August. 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.