10-day surf forecast with Strike Scores for Sunabe Seawall, Chatan, Japan
Sunabe Seawall is the most hallowed ground for surfing in Okinawa, a series of reef breaks along a seawall near American Village. The area features multiple distinct peaks—Bowls, California, Hawaiians, Hotels—each breaking over rock reef with dedicated paddle channels. The consistent windswell from October through March combines with occasional typhoon groundswells to produce fun waves in tropical water. Shallow reef means you surf around high tide and wear booties, but the warm water and welcoming community make this a Waikiki-like experience.
Best day in the forecast: 2026-08-12 with a score of 25/100 (Poor)
Poor conditions overall: Average score 9/100. Look for spots with better forecasts.
No alignment: Swell from 94° is outside workable range 240°-320°. Wrong swell direction for this spot.
Marginal size: 1.0m is 0.6m from ideal 1.6m.
Good period: 16s is 133% of ideal 12s. Clean, powerful groundswell.
Onshore/cross-shore: 16 km/h from 30° (NNE). Destroying wave quality. Offshore range: 50°-130°.
Groundswell-dominant conditions (clean, long-period waves).
Poor conditions at Sunabe Seawall. Either swell direction (94°), size (1.0m), or wind (16 km/h from 30°) is unfavorable. Consider other spots or wait for better conditions.
1.0m (3.3ft) swell from 94° (E) at 16s period
Local wind-generated waves (choppy, short-period)
No alignment: Swell from 103° is outside workable range 240°-320°. Wrong swell direction for this spot.
Too big: 2.6m exceeds maximum 2.5m. Risk of closeouts.
Good period: 17s is 142% of ideal 12s. Clean, powerful groundswell.
Onshore/cross-shore: 41 km/h from 352° (N). Destroying wave quality. Offshore range: 50°-130°.
-5 points: Short-period windswell is present, creating choppy, disorganized conditions.
Poor conditions at Sunabe Seawall. Either swell direction (103°), size (2.6m), or wind (41 km/h from 352°) is unfavorable. Consider other spots or wait for better conditions.
2.6m (8.5ft) swell from 103° (ESE) at 17s period
No alignment: Swell from 16° is outside workable range 240°-320°. Wrong swell direction for this spot.
Too big: 3.5m exceeds maximum 2.5m. Risk of closeouts.
Onshore/cross-shore: 47 km/h from 233° (SW). Destroying wave quality. Offshore range: 50°-130°.
-10 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
Poor conditions at Sunabe Seawall. Either swell direction (16°), size (3.5m), or wind (47 km/h from 233°) is unfavorable. Consider other spots or wait for better conditions.
3.5m (11.5ft) swell from 16° (NNE) at 17s period
No alignment: Swell from 186° is outside workable range 240°-320°. Wrong swell direction for this spot.
Too big: 4.3m exceeds maximum 2.5m. Risk of closeouts.
Perfect period: 13s is at or above ideal 12s. Long-period groundswell with maximum power.
Onshore/cross-shore: 48 km/h from 146° (SE). Destroying wave quality. Offshore range: 50°-130°.
-17 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
+3 points: Secondary swell from a favorable direction enhances wave shape at this spot.
Poor conditions at Sunabe Seawall. Either swell direction (186°), size (4.3m), or wind (48 km/h from 146°) is unfavorable. Consider other spots or wait for better conditions.
4.3m (14.1ft) swell from 186° (S) at 13s period
Poor alignment: Swell from 229° is 51° off optimal 280°, barely within workable range 240°-320°.
Good size: 1.8m is within 15% of ideal 1.6m.
Perfect period: 12s is at or above ideal 12s. Long-period groundswell with maximum power.
Onshore/cross-shore: 33 km/h from 143° (SE). Destroying wave quality. Offshore range: 50°-130°.
-21 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
Poor conditions at Sunabe Seawall. Either swell direction (229°), size (1.8m), or wind (33 km/h from 143°) is unfavorable. Consider other spots or wait for better conditions.
1.8m (5.9ft) swell from 229° (SW) at 12s period
No alignment: Swell from 350° is outside workable range 240°-320°. Wrong swell direction for this spot.
Good period: 15s is 125% of ideal 12s. Clean, powerful groundswell.
Onshore/cross-shore: 27 km/h from 168° (SSE). Destroying wave quality. Offshore range: 50°-130°.
Poor conditions at Sunabe Seawall. Either swell direction (350°), size (1.8m), or wind (27 km/h from 168°) is unfavorable. Consider other spots or wait for better conditions.
1.8m (5.9ft) swell from 350° (N) at 15s period
Poor alignment: Swell from 223° is 57° off optimal 280°, barely within workable range 240°-320°.
Marginal size: 2.3m is 0.6m from ideal 1.6m.
Onshore/cross-shore: 18 km/h from 175° (S). Destroying wave quality. Offshore range: 50°-130°.
Poor conditions at Sunabe Seawall. Either swell direction (223°), size (2.3m), or wind (18 km/h from 175°) is unfavorable. Consider other spots or wait for better conditions.
2.3m (7.5ft) swell from 223° (SW) at 13s period
No alignment: Swell from 189° is outside workable range 240°-320°. Wrong swell direction for this spot.
Good size: 2.1m is within 15% of ideal 1.6m.
Good period: 11s is 92% of ideal 12s. Clean, powerful groundswell.
Onshore/cross-shore: 14 km/h from 180° (S). Destroying wave quality. Offshore range: 50°-130°.
-11 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
Poor conditions at Sunabe Seawall. Either swell direction (189°), size (2.1m), or wind (14 km/h from 180°) is unfavorable. Consider other spots or wait for better conditions.
2.1m (6.9ft) swell from 189° (S) at 11s period
Very low confidence (8-10 day forecast, conditions may change)
Marginal size: 1.4m is 0.3m from ideal 1.6m.
Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.
Onshore/cross-shore: 16 km/h from 167° (SSE). Destroying wave quality. Offshore range: 50°-130°.
+2 points: Secondary swell from a favorable direction enhances wave shape at this spot.
Poor conditions at Sunabe Seawall. Either swell direction (189°), size (1.4m), or wind (16 km/h from 167°) is unfavorable. Consider other spots or wait for better conditions.
1.4m (4.6ft) swell from 189° (S) at 10s period
No alignment: Swell from 187° is outside workable range 240°-320°. Wrong swell direction for this spot.
Marginal size: 1.1m is 0.5m from ideal 1.6m.
Onshore/cross-shore: 15 km/h from 167° (SSE). Destroying wave quality. Offshore range: 50°-130°.
Poor conditions at Sunabe Seawall. Either swell direction (187°), size (1.1m), or wind (15 km/h from 167°) is unfavorable. Consider other spots or wait for better conditions.
1.1m (3.6ft) swell from 187° (S) at 10s period
Open-Meteo Weather API (wind/weather data)