10-day surf forecast with Strike Scores for Praia Grande, Sintra, Portugal
Praia Grande is Sintra's exposed Atlantic beach break, a consistent stretch of sand that picks up plenty of west and northwest swell. The peaks shift with the banks, offering everything from manageable walls for intermediates to hollow, punchy sections when autumn and winter groundswell arrives. Easy access from Lisbon and Cascais makes it a practical strike option, though wind exposure means timing is everything.
Best day in the forecast: 2026-08-11 with a score of 23/100 (Poor)
Poor conditions overall: Average score 7/100. Look for spots with better forecasts.
Moderate alignment: Swell from 317° is 22° off optimal 295°, workable but not ideal.
Too small: 0.9m is below minimum 1.2m. Waves will be weak/mushy.
Short period: 10s is below minimum 10s. Windswell-dominated (choppy, weak waves).
Onshore/cross-shore: 16 km/h from 344° (NNW). Destroying wave quality. Offshore range: 90°-135°.
Groundswell-dominant conditions (clean, long-period waves).
Poor conditions at Praia Grande. Either swell direction (317°), size (0.9m), or wind (16 km/h from 344°) is unfavorable. Consider other spots or wait for better conditions.
0.9m (3.0ft) swell from 317° (NW) at 9.8s period
Local wind-generated waves (choppy, short-period)
Poor alignment: Swell from 336° is 41° off optimal 295°, barely within workable range 270°-320°.
Short period: 8s is below minimum 10s. Windswell-dominated (choppy, weak waves).
Onshore/cross-shore: 21 km/h from 352° (N). Destroying wave quality. Offshore range: 90°-135°.
-5 points: Short-period windswell is present, creating choppy, disorganized conditions.
Poor conditions at Praia Grande. Either swell direction (336°), size (0.9m), or wind (21 km/h from 352°) is unfavorable. Consider other spots or wait for better conditions.
0.9m (3.0ft) swell from 336° (NNW) at 8.2s period
Poor alignment: Swell from 345° is 50° off optimal 295°, barely within workable range 270°-320°.
Onshore/cross-shore: 13 km/h from 349° (N). Destroying wave quality. Offshore range: 90°-135°.
-10 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
Poor conditions at Praia Grande. Either swell direction (345°), size (0.9m), or wind (13 km/h from 349°) is unfavorable. Consider other spots or wait for better conditions.
0.9m (3.0ft) swell from 345° (NNW) at 8.4s period
Good alignment: Swell from 292° is 3° off optimal 295°, still within prime range.
Too small: 0.8m is below minimum 1.2m. Waves will be weak/mushy.
Short period: 9s is below minimum 10s. Windswell-dominated (choppy, weak waves).
Onshore/cross-shore: 9 km/h from 307° (NW). Destroying wave quality. Offshore range: 90°-135°.
-7 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
Poor conditions at Praia Grande. Either swell direction (292°), size (0.8m), or wind (9 km/h from 307°) is unfavorable. Consider other spots or wait for better conditions.
0.8m (2.6ft) swell from 292° (WNW) at 9s period
Moderate alignment: Swell from 277° is 18° off optimal 295°, workable but not ideal.
Onshore/cross-shore: 12 km/h from 342° (NNW). Destroying wave quality. Offshore range: 90°-135°.
Poor conditions at Praia Grande. Either swell direction (277°), size (0.9m), or wind (12 km/h from 342°) is unfavorable. Consider other spots or wait for better conditions.
0.9m (3.0ft) swell from 277° (W) at 8s period
Moderate alignment: Swell from 324° is 29° off optimal 295°, workable but not ideal.
Marginal size: 1.3m is 0.5m from ideal 1.8m.
Short period: 7s is below minimum 10s. Windswell-dominated (choppy, weak waves).
Onshore/cross-shore: 17 km/h from 336° (NNW). Destroying wave quality. Offshore range: 90°-135°.
Poor conditions at Praia Grande. Either swell direction (324°), size (1.3m), or wind (17 km/h from 336°) is unfavorable. Consider other spots or wait for better conditions.
1.3m (4.3ft) swell from 324° (NW) at 7s period
Poor alignment: Swell from 331° is 36° off optimal 295°, barely within workable range 270°-320°.
Moderate period: 11s meets minimum 10s but below ideal 14s. Some groundswell energy present.
Onshore/cross-shore: 11 km/h from 340° (NNW). Destroying wave quality. Offshore range: 90°-135°.
Poor conditions at Praia Grande. Either swell direction (331°), size (1.3m), or wind (11 km/h from 340°) is unfavorable. Consider other spots or wait for better conditions.
1.3m (4.3ft) swell from 331° (NNW) at 11s period
Good alignment: Swell from 298° is 3° off optimal 295°, still within prime range.
Marginal size: 1.2m is 0.6m from ideal 1.8m.
Moderate period: 10s meets minimum 10s but below ideal 14s. Some groundswell energy present.
Onshore/cross-shore: 20 km/h from 342° (NNW). Destroying wave quality. Offshore range: 90°-135°.
Poor conditions at Praia Grande. Either swell direction (298°), size (1.2m), or wind (20 km/h from 342°) is unfavorable. Consider other spots or wait for better conditions.
1.2m (3.9ft) swell from 298° (WNW) at 10s period
Very low confidence (8-10 day forecast, conditions may change)
Moderate alignment: Swell from 304° is 9° off optimal 295°, workable but not ideal.
Too small: 1.1m is below minimum 1.2m. Waves will be weak/mushy.
Onshore/cross-shore: 28 km/h from 350° (N). Destroying wave quality. Offshore range: 90°-135°.
Poor conditions at Praia Grande. Either swell direction (304°), size (1.1m), or wind (28 km/h from 350°) is unfavorable. Consider other spots or wait for better conditions.
1.1m (3.6ft) swell from 304° (NW) at 10s period
Moderate alignment: Swell from 283° is 12° off optimal 295°, workable but not ideal.
Onshore/cross-shore: 27 km/h from 350° (N). Destroying wave quality. Offshore range: 90°-135°.
Poor conditions at Praia Grande. Either swell direction (283°), size (0.8m), or wind (27 km/h from 350°) is unfavorable. Consider other spots or wait for better conditions.
0.8m (2.6ft) swell from 283° (WNW) at 9s period
Open-Meteo Weather API (wind/weather data)