10-day surf forecast with Strike Scores for Chun's Reef, North Shore, Oahu, USA
Chun's Reef is the mellow side of the North Shore—a fun reef break that offers longboard-friendly rights without the intensity of its bigger-name neighbors. Accessible and forgiving, it's one of the best spots for intermediate surfers to experience North Shore waves.
Best day in the forecast: 2026-08-13 with a score of 23/100 (Poor)
Poor conditions overall: Average score 5/100. Look for spots with better forecasts.
No alignment: Swell from 172° is outside workable range 300°-330°. Wrong swell direction for this spot.
Too small: 0.7m is below minimum 0.9m. Waves will be weak/mushy.
Moderate period: 10s meets minimum 10s but below ideal 14s. Some groundswell energy present.
Onshore/cross-shore: 12 km/h from 75° (ENE). Destroying wave quality. Offshore range: 100°-170°.
-11 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
Groundswell-dominant conditions (clean, long-period waves).
Poor conditions at Chun's Reef. Either swell direction (172°), size (0.7m), or wind (12 km/h from 75°) is unfavorable. Consider other spots or wait for better conditions.
0.7m (2.3ft) swell from 172° (S) at 10s period
No alignment: Swell from 178° is outside workable range 300°-330°. Wrong swell direction for this spot.
Onshore/cross-shore: 16 km/h from 77° (ENE). Destroying wave quality. Offshore range: 100°-170°.
Poor conditions at Chun's Reef. Either swell direction (178°), size (0.7m), or wind (16 km/h from 77°) is unfavorable. Consider other spots or wait for better conditions.
0.7m (2.3ft) swell from 178° (S) at 10s period
Local wind-generated waves (choppy, short-period)
No alignment: Swell from 182° is outside workable range 300°-330°. Wrong swell direction for this spot.
Too small: 0.6m is below minimum 0.9m. Waves will be weak/mushy.
Onshore/cross-shore: 16 km/h from 75° (ENE). Destroying wave quality. Offshore range: 100°-170°.
Poor conditions at Chun's Reef. Either swell direction (182°), size (0.6m), or wind (16 km/h from 75°) is unfavorable. Consider other spots or wait for better conditions.
0.6m (2.0ft) swell from 182° (S) at 10s period
No alignment: Swell from 188° is outside workable range 300°-330°. Wrong swell direction for this spot.
Good period: 13s is 93% of ideal 14s. Clean, powerful groundswell.
Onshore/cross-shore: 17 km/h from 78° (ENE). Destroying wave quality. Offshore range: 100°-170°.
Poor conditions at Chun's Reef. Either swell direction (188°), size (0.6m), or wind (17 km/h from 78°) is unfavorable. Consider other spots or wait for better conditions.
0.6m (2.0ft) swell from 188° (S) at 13s period
No alignment: Swell from 189° is outside workable range 300°-330°. Wrong swell direction for this spot.
Too small: 0.8m is below minimum 0.9m. Waves will be weak/mushy.
Moderate period: 12s meets minimum 10s but below ideal 14s. Some groundswell energy present.
Onshore/cross-shore: 19 km/h from 77° (ENE). Destroying wave quality. Offshore range: 100°-170°.
-5 points: Short-period windswell is present, creating choppy, disorganized conditions.
Poor conditions at Chun's Reef. Either swell direction (189°), size (0.8m), or wind (19 km/h from 77°) is unfavorable. Consider other spots or wait for better conditions.
0.8m (2.6ft) swell from 189° (S) at 12s period
No alignment: Swell from 181° is outside workable range 300°-330°. Wrong swell direction for this spot.
Marginal size: 0.9m is 0.5m from ideal 1.4m.
Onshore/cross-shore: 20 km/h from 72° (ENE). Destroying wave quality. Offshore range: 100°-170°.
Poor conditions at Chun's Reef. Either swell direction (181°), size (0.9m), or wind (20 km/h from 72°) is unfavorable. Consider other spots or wait for better conditions.
0.9m (3.0ft) swell from 181° (S) at 10s period
No alignment: Swell from 161° is outside workable range 300°-330°. Wrong swell direction for this spot.
Onshore/cross-shore: 17 km/h from 75° (ENE). Destroying wave quality. Offshore range: 100°-170°.
Poor conditions at Chun's Reef. Either swell direction (161°), size (0.9m), or wind (17 km/h from 75°) is unfavorable. Consider other spots or wait for better conditions.
0.9m (3.0ft) swell from 161° (SSE) at 12s period
No alignment: Swell from 190° is outside workable range 300°-330°. Wrong swell direction for this spot.
Onshore/cross-shore: 18 km/h from 77° (ENE). Destroying wave quality. Offshore range: 100°-170°.
Poor conditions at Chun's Reef. Either swell direction (190°), size (0.9m), or wind (18 km/h from 77°) is unfavorable. Consider other spots or wait for better conditions.
0.9m (3.0ft) swell from 190° (S) at 13s period
Very low confidence (8-10 day forecast, conditions may change)
No alignment: Swell from 191° is outside workable range 300°-330°. Wrong swell direction for this spot.
Marginal size: 1.1m is 0.3m from ideal 1.4m.
Perfect period: 15s is at or above ideal 14s. Long-period groundswell with maximum power.
Onshore/cross-shore: 16 km/h from 73° (ENE). Destroying wave quality. Offshore range: 100°-170°.
Poor conditions at Chun's Reef. Either swell direction (191°), size (1.1m), or wind (16 km/h from 73°) is unfavorable. Consider other spots or wait for better conditions.
1.1m (3.6ft) swell from 191° (S) at 15s period
Marginal size: 1.4m is 0.0m from ideal 1.4m.
Onshore/cross-shore: 19 km/h from 76° (ENE). Destroying wave quality. Offshore range: 100°-170°.
Poor conditions at Chun's Reef. Either swell direction (188°), size (1.4m), or wind (19 km/h from 76°) is unfavorable. Consider other spots or wait for better conditions.
1.4m (4.6ft) swell from 188° (S) at 13s period
Open-Meteo Weather API (wind/weather data)