Johanna - surf spot statistics

Johanna in Australia is a powerful and consistent reef break that receives high-quality ground swells year-round, making it a reliable spot for experienced surfers. The swell is almost always present, with ground swells dominating 89-98% of the time—highest from March through September, peaking at 98% in May, September, and October. Wind conditions, however, are far less favorable, with bad winds (onshore or cross-shore) affecting 74-83% of days, meaning clean conditions are rare. The best chance for good winds (offshore) is in autumn (April-May), reaching up to 26% in April. Swell size builds from late autumn through winter, averaging 2.8-3.2m from April to September, with the biggest waves in August (3.2m). Summer (December-February) sees slightly smaller swells (2.4-2.5m) but the worst wind conditions (80-83% unfavorable). The optimal window is April to May, when swell size is solid (2.8-2.9m), ground swells are most consistent (97-98%), and wind conditions are relatively better (25-26% good). Winter (June-August) offers the largest waves (3.0-3.2m) but worse winds, while spring (September-November) remains big but with poor wind odds. Overall, advanced surfers should target mid-autumn for the best balance of swell and wind, accepting that Johanna is more about raw power than perfect conditions.

March at Johanna, Australia, delivers consistent surf with an average swell height of 2.6m and a strong, well-spaced period of 13.1s—ideal for generating powerful, clean waves. The swell is predominantly from the SW (37.36% of waves over 1.5m), providing long, organized lines that suit experienced surfers. Secondary contributions from SSW and WSW add variety, though smaller swells from the SE and S are less frequent. Wind conditions are less reliable, with only 22% of days offering ideal offshore or light cross-shore winds (typically ENE to ESE). However, strong onshore WSW to W winds (20+ kph) are common, particularly at higher speeds (20–50 kph), which can degrade wave quality. For skilled surfers, March offers solid swell energy with the potential for epic sessions when winds align, but patience is key given the variable wind patterns. Bigger days (2m+) are frequent, making it a prime month for those comfortable in powerful conditions.