Gas Bay - surf spot statistics

Gas Bay, Australia, is a surf spot predominantly driven by ground swell year-round, with minimal wind swell interference and almost no days of flat conditions. The best months for surfing here are typically from April to September, when the swell is both consistent and powerful, with mean sizes peaking at 3.7m in July and August. However, wind conditions are less favorable during these months, with good wind days only occurring around 15-24% of the time—best in May (24%) but still generally challenging. The shoulder months of April and May offer a slightly better balance, with decent swell size (2.7m-3.1m) and marginally improved wind chances (23-24%). While winter delivers the largest and most consistent swell, the high prevalence of onshore and unfavorable winds makes it a demanding period for surfers. The rest of the year, from October to March, sees smaller swells (2.3m-3.0m), but wind conditions remain poor, rarely exceeding 18% favorable days. For surfers prioritizing swell size and consistency over wind conditions, mid-autumn to early winter (April-July) is the prime window, though patience with winds is required. If cleaner conditions are preferred, May presents the best compromise with solid swell and relatively better wind odds, though still far from ideal. Overall, Gas Bay is a powerful, swell-rich spot where surfers must often contend with wind challenges, particularly outside of the May window.

December at Gas Bay delivers consistent, powerful surf with an average swell height of 2.3m and a solid 12.7s period, ensuring well-formed, energy-packed waves. The dominant swell direction is from the SW, contributing the majority of rideable conditions—particularly in the 1.5-2.5m range, where swell peaks in quality and consistency. Larger sets (2.5m+) are less frequent but offer heavier, more challenging waves. Wind conditions are the limiting factor, with only 11% of days providing ideal offshore or light cross-shore winds (typically from the NE quadrant). The prevailing SE to S winds often create onshore chop, especially at higher speeds (20-30kph), which can degrade wave quality. For experienced surfers, patience and timing are key—target early mornings or days with wind shifts for the cleanest sessions. Winter swells ensure plenty of power, but expect variable surface conditions unless the wind cooperates.