Thunders - surf spot statistics

Thunders in Indonesia is a consistent and high-quality surf spot with reliable ground swells throughout the year. The best months for surfing are generally from May to September, when the swell is most potent and wind conditions are most favorable. During this period, ground swell dominates at 97–100%, ensuring clean, powerful waves with minimal wind interference. The mean swell size peaks at 1.9m in July, offering ideal conditions for experienced surfers. Wind conditions improve significantly from May onward, with good winds occurring 51–70% of the time, particularly peaking in July at 70%. Outside this window, from November to March, the swell remains strong but is accompanied by less favorable onshore winds, reducing rideable days. December to February still see decent ground swell (82–92%), but bad wind conditions prevail 62–76% of the time, making sessions more inconsistent. April and October serve as transitional months, offering a mix of solid swell and improving wind conditions. Overall, Thunders delivers year-round surf, but the prime months are mid-year, with July standing out as the peak for both wave quality and wind reliability.

**Thunders, Indonesia in November** offers consistent surf with an average swell height of 1.3m and a strong period of 13.8s, indicating powerful, well-spaced waves. The primary swell direction is SSW (30% of waves in the 1-1.5m range, 9.5% in 1.5-2m), followed by SW and WSW, which contribute punchy, steep takeoffs when larger sets arrive. Wind conditions are favorable for surfing 45% of the time, with the most common light to moderate winds coming from SE to SSE (8–12kph). However, stronger NW and WNW winds (occasionally 20–30kph) can create choppy conditions, especially in the afternoons. Expect a mix of waist-high to slightly overhead waves, with the best sessions occurring during lighter wind windows when the SSW swell aligns cleanly. Advanced surfers will find the most opportunities, particularly on days with WSW energy (6% of waves 1.5–2m, 2% 2–2.5m), which can produce faster, hollower sections. Plan around morning sessions for optimal conditions.