10-day surf forecast with Strike Scores for Itamambuca, Ubatuba, SP, Brazil
Itamambuca is one of Ubatuba's premier waves and a regular competition venue on the Brazilian surf circuit. The rivermouth creates constantly shifting sandbars that produce powerful peaks with both lefts and rights. The beach can pick up swell from almost any direction, making it one of the most versatile spots on the São Paulo coast. The surrounding area is lush and tropical, with the river providing a natural boundary that keeps the vibe more relaxed than some of Brazil's more famous breaks.
Best day in the forecast: 2026-08-09 with a score of 63/100 (Fair)
Poor conditions overall: Average score 46/100. Look for spots with better forecasts.
Moderate alignment: Swell from 107° is 28° off optimal 135°, workable but not ideal.
Too small: 0.7m is below minimum 0.9m. Waves will be weak/mushy.
Moderate period: 8s meets minimum 8s but below ideal 12s. Some groundswell energy present.
Glassy: Wind speed 3 km/h (light/variable). Perfect mirror-like surface.
Groundswell-dominant conditions (clean, long-period waves).
Poor conditions at Itamambuca. Either swell direction (107°), size (0.7m), or wind (3 km/h from 208°) is unfavorable. Consider other spots or wait for better conditions.
0.7m (2.3ft) swell from 107° (ESE) at 8s period
Moderate alignment: Swell from 119° is 16° off optimal 135°, workable but not ideal.
Too small: 0.8m is below minimum 0.9m. Waves will be weak/mushy.
Onshore/cross-shore: 5 km/h from 162° (SSE). Destroying wave quality. Offshore range: 270°-45°.
Poor conditions at Itamambuca. Either swell direction (119°), size (0.8m), or wind (5 km/h from 162°) is unfavorable. Consider other spots or wait for better conditions.
0.8m (2.6ft) swell from 119° (ESE) at 8s period
Poor alignment: Swell from 101° is 34° off optimal 135°, barely within workable range 95°-170°.
Marginal size: 0.9m is 0.8m from ideal 1.7m.
Light offshore: 7 km/h from 355° (N). Grooming the wave face beautifully.
Poor conditions at Itamambuca. Either swell direction (101°), size (0.9m), or wind (7 km/h from 355°) is unfavorable. Consider other spots or wait for better conditions.
0.9m (3.0ft) swell from 101° (E) at 8s period
Poor alignment: Swell from 98° is 37° off optimal 135°, barely within workable range 95°-170°.
Onshore/cross-shore: 5 km/h from 147° (SSE). Destroying wave quality. Offshore range: 270°-45°.
Poor conditions at Itamambuca. Either swell direction (98°), size (0.8m), or wind (5 km/h from 147°) is unfavorable. Consider other spots or wait for better conditions.
0.8m (2.6ft) swell from 98° (E) at 8s period
Good alignment: Swell from 138° is 3° off optimal 135°, still within prime range.
Perfect period: 13s is at or above ideal 12s. Long-period groundswell with maximum power.
Onshore/cross-shore: 5 km/h from 193° (SSW). Destroying wave quality. Offshore range: 270°-45°.
Surfable but not special at Itamambuca. The 0.8m swell from 138° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
0.8m (2.6ft) swell from 138° (SE) at 13s period
Moderate alignment: Swell from 116° is 19° off optimal 135°, workable but not ideal.
Marginal size: 1.0m is 0.7m from ideal 1.7m.
Good period: 11s is 92% of ideal 12s. Clean, powerful groundswell.
Onshore/cross-shore: 5 km/h from 174° (S). Destroying wave quality. Offshore range: 270°-45°.
Surfable but not special at Itamambuca. The 1.0m swell from 116° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
1.0m (3.3ft) swell from 116° (ESE) at 11s period
Poor alignment: Swell from 166° is 31° off optimal 135°, barely within workable range 95°-170°.
Onshore/cross-shore: 6 km/h from 209° (SSW). Destroying wave quality. Offshore range: 270°-45°.
Surfable but not special at Itamambuca. The 1.0m swell from 166° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
1.0m (3.3ft) swell from 166° (SSE) at 13s period
Good alignment: Swell from 139° is 4° off optimal 135°, still within prime range.
Marginal size: 1.1m is 0.6m from ideal 1.7m.
Moderate period: 9s meets minimum 8s but below ideal 12s. Some groundswell energy present.
Onshore/cross-shore: 6 km/h from 111° (ESE). Destroying wave quality. Offshore range: 270°-45°.
Surfable but not special at Itamambuca. The 1.1m swell from 139° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
1.1m (3.6ft) swell from 139° (SE) at 9s period
Local wind-generated waves (choppy, short-period)
Very low confidence (8-10 day forecast, conditions may change)
Poor alignment: Swell from 167° is 32° off optimal 135°, barely within workable range 95°-170°.
Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.
Onshore/cross-shore: 4 km/h from 183° (S). Destroying wave quality. Offshore range: 270°-45°.
Surfable but not special at Itamambuca. The 1.0m swell from 167° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
1.0m (3.3ft) swell from 167° (SSE) at 10s period
Poor alignment: Swell from 168° is 33° off optimal 135°, barely within workable range 95°-170°.
Marginal size: 1.2m is 0.5m from ideal 1.7m.
Onshore/cross-shore: 6 km/h from 181° (S). Destroying wave quality. Offshore range: 270°-45°.
Surfable but not special at Itamambuca. The 1.2m swell from 168° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
1.2m (3.9ft) swell from 168° (SSE) at 10s period
Open-Meteo Weather API (wind/weather data)