10-day surf forecast with Strike Scores for Roca Cuadrada, Matanzas, Chile
Roca Cuadrada ("Square Rock") is a big wave left reef near Matanzas that comes alive on massive SW swells. Named for a distinctive square-shaped rock, the wave can produce 30-foot faces for tow-in chargers.
Best day in the forecast: 2026-08-10 with a score of 30/100 (Poor)
Poor conditions overall: Average score 17/100. Look for spots with better forecasts.
Poor alignment: Swell from 259° is 34° off optimal 225°, barely within workable range 200°-250°.
Too small: 2.8m is below minimum 4.5m. Waves will be weak/mushy.
Short period: 13s is below minimum 16s. Windswell-dominated (choppy, weak waves).
Onshore/cross-shore: 12 km/h from 206° (SSW). Destroying wave quality. Offshore range: 70°-110°.
Groundswell-dominant conditions (clean, long-period waves).
Poor conditions at Roca Cuadrada. Either swell direction (259°), size (2.8m), or wind (12 km/h from 206°) is unfavorable. Consider other spots or wait for better conditions.
2.8m (9.2ft) swell from 259° (W) at 13s period
Local wind-generated waves (choppy, short-period)
Moderate alignment: Swell from 248° is 23° off optimal 225°, workable but not ideal.
Too small: 2.4m is below minimum 4.5m. Waves will be weak/mushy.
Onshore/cross-shore: 8 km/h from 349° (N). Destroying wave quality. Offshore range: 70°-110°.
Poor conditions at Roca Cuadrada. Either swell direction (248°), size (2.4m), or wind (8 km/h from 349°) is unfavorable. Consider other spots or wait for better conditions.
2.4m (7.9ft) swell from 248° (WSW) at 13s period
Moderate alignment: Swell from 247° is 22° off optimal 225°, workable but not ideal.
Too small: 3.0m is below minimum 4.5m. Waves will be weak/mushy.
Short period: 11s is below minimum 16s. Windswell-dominated (choppy, weak waves).
Onshore/cross-shore: 12 km/h from 179° (S). Destroying wave quality. Offshore range: 70°-110°.
Poor conditions at Roca Cuadrada. Either swell direction (247°), size (3.0m), or wind (12 km/h from 179°) is unfavorable. Consider other spots or wait for better conditions.
3.0m (9.8ft) swell from 247° (WSW) at 11s period
Moderate alignment: Swell from 243° is 18° off optimal 225°, workable but not ideal.
Too small: 1.8m is below minimum 4.5m. Waves will be weak/mushy.
Onshore/cross-shore: 13 km/h from 232° (SW). Destroying wave quality. Offshore range: 70°-110°.
Poor conditions at Roca Cuadrada. Either swell direction (243°), size (1.8m), or wind (13 km/h from 232°) is unfavorable. Consider other spots or wait for better conditions.
1.8m (5.9ft) swell from 243° (WSW) at 13s period
Moderate alignment: Swell from 234° is 9° off optimal 225°, workable but not ideal.
Too small: 4.0m is below minimum 4.5m. Waves will be weak/mushy.
Short period: 15s is below minimum 16s. Windswell-dominated (choppy, weak waves).
Onshore/cross-shore: 12 km/h from 193° (SSW). Destroying wave quality. Offshore range: 70°-110°.
Poor conditions at Roca Cuadrada. Either swell direction (234°), size (4.0m), or wind (12 km/h from 193°) is unfavorable. Consider other spots or wait for better conditions.
4.0m (13.1ft) swell from 234° (SW) at 15s period
Good alignment: Swell from 231° is 6° off optimal 225°, still within prime range.
Too small: 3.6m is below minimum 4.5m. Waves will be weak/mushy.
Short period: 14s is below minimum 16s. Windswell-dominated (choppy, weak waves).
Onshore/cross-shore: 15 km/h from 190° (S). Destroying wave quality. Offshore range: 70°-110°.
Poor conditions at Roca Cuadrada. Either swell direction (231°), size (3.6m), or wind (15 km/h from 190°) is unfavorable. Consider other spots or wait for better conditions.
3.6m (11.8ft) swell from 231° (SW) at 14s period
Good alignment: Swell from 229° is 4° off optimal 225°, still within prime range.
Too small: 2.3m is below minimum 4.5m. Waves will be weak/mushy.
Onshore/cross-shore: 9 km/h from 202° (SSW). Destroying wave quality. Offshore range: 70°-110°.
Poor conditions at Roca Cuadrada. Either swell direction (229°), size (2.3m), or wind (9 km/h from 202°) is unfavorable. Consider other spots or wait for better conditions.
2.3m (7.5ft) swell from 229° (SW) at 14s period
Good alignment: Swell from 227° is 2° off optimal 225°, still within prime range.
Too small: 1.3m is below minimum 4.5m. Waves will be weak/mushy.
Onshore/cross-shore: 10 km/h from 190° (S). Destroying wave quality. Offshore range: 70°-110°.
Poor conditions at Roca Cuadrada. Either swell direction (227°), size (1.3m), or wind (10 km/h from 190°) is unfavorable. Consider other spots or wait for better conditions.
1.3m (4.3ft) swell from 227° (SW) at 13s period
Very low confidence (8-10 day forecast, conditions may change)
Poor alignment: Swell from 262° is 37° off optimal 225°, barely within workable range 200°-250°.
Too small: 1.0m is below minimum 4.5m. Waves will be weak/mushy.
Onshore/cross-shore: 9 km/h from 212° (SSW). Destroying wave quality. Offshore range: 70°-110°.
Poor conditions at Roca Cuadrada. Either swell direction (262°), size (1.0m), or wind (9 km/h from 212°) is unfavorable. Consider other spots or wait for better conditions.
1.0m (3.3ft) swell from 262° (W) at 15s period
Moderate alignment: Swell from 242° is 17° off optimal 225°, workable but not ideal.
Too small: 1.6m is below minimum 4.5m. Waves will be weak/mushy.
Moderate period: 16s meets minimum 16s but below ideal 20s. Some groundswell energy present.
Onshore/cross-shore: 10 km/h from 40° (NE). Destroying wave quality. Offshore range: 70°-110°.
Poor conditions at Roca Cuadrada. Either swell direction (242°), size (1.6m), or wind (10 km/h from 40°) is unfavorable. Consider other spots or wait for better conditions.
1.6m (5.2ft) swell from 242° (WSW) at 16s period
Open-Meteo Weather API (wind/weather data)