10-day surf forecast with Strike Scores for Icelands, North Sipora, Mentawai, Indonesia
Icelands (also known as Omak Tidur) is the premier big-wave location in the Mentawai Islands, capable of handling swells up to 20+ feet. Located in North Sipora, this powerful left reef break only wakes up on the largest W-SW swells and rewards expert surfers with massive, hollow waves. The wave is strictly for experienced big-wave riders, as wipeouts are extremely consequential on the deep-water reef. One of the most awe-inspiring waves in all of Indonesia when conditions align.
Best day in the forecast: 2026-08-07 with a score of 64/100 (Fair)
Poor conditions overall: Average score 37/100. Look for spots with better forecasts.
Poor alignment: Swell from 194° is 51° off optimal 245°, barely within workable range 230°-260°.
Too small: 2.1m is below minimum 2.4m. Waves will be weak/mushy.
Good period: 15s is 94% of ideal 16s. Clean, powerful groundswell.
Onshore/cross-shore: 7 km/h from 333° (NNW). Destroying wave quality. Offshore range: 60°-120°.
Groundswell-dominant conditions (clean, long-period waves).
Poor conditions at Icelands. Either swell direction (194°), size (2.1m), or wind (7 km/h from 333°) is unfavorable. Consider other spots or wait for better conditions.
2.1m (6.9ft) swell from 194° (SSW) at 15s period
Poor alignment: Swell from 200° is 45° off optimal 245°, barely within workable range 230°-260°.
Marginal size: 3.1m is 1.1m from ideal 4.3m.
Perfect period: 17s is at or above ideal 16s. Long-period groundswell with maximum power.
Onshore/cross-shore: 9 km/h from 345° (NNW). Destroying wave quality. Offshore range: 60°-120°.
Surfable but not special at Icelands. The 3.1m swell from 200° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
3.1m (10.2ft) swell from 200° (SSW) at 17s period
Poor alignment: Swell from 197° is 48° off optimal 245°, barely within workable range 230°-260°.
Perfect period: 16s is at or above ideal 16s. Long-period groundswell with maximum power.
Onshore/cross-shore: 4 km/h from 143° (SE). Destroying wave quality. Offshore range: 60°-120°.
Surfable but not special at Icelands. The 3.1m swell from 197° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
3.1m (10.2ft) swell from 197° (SSW) at 16s period
Poor alignment: Swell from 193° is 52° off optimal 245°, barely within workable range 230°-260°.
Marginal size: 3.2m is 1.0m from ideal 4.3m.
Onshore/cross-shore: 11 km/h from 140° (SE). Destroying wave quality. Offshore range: 60°-120°.
Poor conditions at Icelands. Either swell direction (193°), size (3.2m), or wind (11 km/h from 140°) is unfavorable. Consider other spots or wait for better conditions.
3.2m (10.5ft) swell from 193° (SSW) at 16s period
Poor alignment: Swell from 192° is 53° off optimal 245°, barely within workable range 230°-260°.
Marginal size: 2.9m is 1.4m from ideal 4.3m.
Onshore/cross-shore: 14 km/h from 164° (SSE). Destroying wave quality. Offshore range: 60°-120°.
Poor conditions at Icelands. Either swell direction (192°), size (2.9m), or wind (14 km/h from 164°) is unfavorable. Consider other spots or wait for better conditions.
2.9m (9.5ft) swell from 192° (SSW) at 16s period
Local wind-generated waves (choppy, short-period)
Poor alignment: Swell from 188° is 57° off optimal 245°, barely within workable range 230°-260°.
Marginal size: 2.7m is 1.5m from ideal 4.3m.
Onshore/cross-shore: 11 km/h from 161° (SSE). Destroying wave quality. Offshore range: 60°-120°.
Poor conditions at Icelands. Either swell direction (188°), size (2.7m), or wind (11 km/h from 161°) is unfavorable. Consider other spots or wait for better conditions.
2.7m (8.9ft) swell from 188° (S) at 15s period
No alignment: Swell from 182° is outside workable range 230°-260°. Wrong swell direction for this spot.
Marginal size: 3.8m is 0.5m from ideal 4.3m.
Onshore/cross-shore: 10 km/h from 136° (SE). Destroying wave quality. Offshore range: 60°-120°.
Poor conditions at Icelands. Either swell direction (182°), size (3.8m), or wind (10 km/h from 136°) is unfavorable. Consider other spots or wait for better conditions.
3.8m (12.5ft) swell from 182° (S) at 17s period
No alignment: Swell from 181° is outside workable range 230°-260°. Wrong swell direction for this spot.
Marginal size: 3.5m is 0.8m from ideal 4.3m.
Onshore/cross-shore: 15 km/h from 145° (SE). Destroying wave quality. Offshore range: 60°-120°.
Poor conditions at Icelands. Either swell direction (181°), size (3.5m), or wind (15 km/h from 145°) is unfavorable. Consider other spots or wait for better conditions.
3.5m (11.5ft) swell from 181° (S) at 16s period
Very low confidence (8-10 day forecast, conditions may change)
No alignment: Swell from 178° is outside workable range 230°-260°. Wrong swell direction for this spot.
Onshore/cross-shore: 11 km/h from 133° (SE). Destroying wave quality. Offshore range: 60°-120°.
Poor conditions at Icelands. Either swell direction (178°), size (2.7m), or wind (11 km/h from 133°) is unfavorable. Consider other spots or wait for better conditions.
2.7m (8.9ft) swell from 178° (S) at 15s period
No alignment: Swell from 183° is outside workable range 230°-260°. Wrong swell direction for this spot.
Marginal size: 2.4m is 1.9m from ideal 4.3m.
Onshore/cross-shore: 12 km/h from 157° (SSE). Destroying wave quality. Offshore range: 60°-120°.
Poor conditions at Icelands. Either swell direction (183°), size (2.4m), or wind (12 km/h from 157°) is unfavorable. Consider other spots or wait for better conditions.
2.4m (7.9ft) swell from 183° (S) at 15s period
Open-Meteo Weather API (wind/weather data)