10-day surf forecast with Strike Scores for Nipussi, Siberut, Mentawai, Indonesia
Nipussi is an easy-going left reef break on Siberut Island in the Mentawai chain, set against a beautiful tropical backdrop. The wave is one of the more accessible breaks in the Mentawais, making it ideal for intermediate surfers who want to experience the islands' renowned water quality and scenery without the intensity of expert-level breaks. A great warm-up or cool-down spot during Mentawai charter trips.
Best day in the forecast: 2026-08-14 with a score of 61/100 (Fair)
Poor conditions overall: Average score 46/100. Look for spots with better forecasts.
Poor alignment: Swell from 195° is 40° off optimal 235°, barely within workable range 210°-260°.
Marginal size: 1.8m is 0.4m from ideal 1.4m.
Perfect period: 15s is at or above ideal 14s. Long-period groundswell with maximum power.
Onshore/cross-shore: 11 km/h from 329° (NNW). Destroying wave quality. Offshore range: 82°-142°.
Groundswell-dominant conditions (clean, long-period waves).
Surfable but not special at Nipussi. The 1.8m swell from 195° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
1.8m (5.9ft) swell from 195° (SSW) at 15s period
Poor alignment: Swell from 198° is 37° off optimal 235°, barely within workable range 210°-260°.
Too big: 2.6m exceeds maximum 1.8m. Risk of closeouts.
Good period: 17s is 121% of ideal 14s. Clean, powerful groundswell.
Onshore/cross-shore: 9 km/h from 323° (NW). Destroying wave quality. Offshore range: 82°-142°.
Poor conditions at Nipussi. Either swell direction (198°), size (2.6m), or wind (9 km/h from 323°) is unfavorable. Consider other spots or wait for better conditions.
2.6m (8.5ft) swell from 198° (SSW) at 17s period
Poor alignment: Swell from 197° is 38° off optimal 235°, barely within workable range 210°-260°.
Perfect period: 16s is at or above ideal 14s. Long-period groundswell with maximum power.
Glassy: Wind speed 3 km/h (light/variable). Perfect mirror-like surface.
Surfable but not special at Nipussi. The 2.6m swell from 197° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
2.6m (8.5ft) swell from 197° (SSW) at 16s period
Poor alignment: Swell from 191° is 44° off optimal 235°, barely within workable range 210°-260°.
Too big: 2.7m exceeds maximum 1.8m. Risk of closeouts.
Light offshore: 9 km/h from 128° (SE). Grooming the wave face beautifully.
Surfable but not special at Nipussi. The 2.7m swell from 191° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
2.7m (8.9ft) swell from 191° (S) at 16s period
Poor alignment: Swell from 192° is 43° off optimal 235°, barely within workable range 210°-260°.
Onshore/cross-shore: 15 km/h from 151° (SSE). Destroying wave quality. Offshore range: 82°-142°.
Poor conditions at Nipussi. Either swell direction (192°), size (2.6m), or wind (15 km/h from 151°) is unfavorable. Consider other spots or wait for better conditions.
2.6m (8.5ft) swell from 192° (SSW) at 16s period
Local wind-generated waves (choppy, short-period)
Poor alignment: Swell from 188° is 47° off optimal 235°, barely within workable range 210°-260°.
Too big: 2.4m exceeds maximum 1.8m. Risk of closeouts.
Onshore/cross-shore: 10 km/h from 160° (SSE). Destroying wave quality. Offshore range: 82°-142°.
Poor conditions at Nipussi. Either swell direction (188°), size (2.4m), or wind (10 km/h from 160°) is unfavorable. Consider other spots or wait for better conditions.
2.4m (7.9ft) swell from 188° (S) at 15s period
Poor alignment: Swell from 183° is 52° off optimal 235°, barely within workable range 210°-260°.
Too big: 3.3m exceeds maximum 1.8m. Risk of closeouts.
Light offshore: 8 km/h from 136° (SE). Grooming the wave face beautifully.
Poor conditions at Nipussi. Either swell direction (183°), size (3.3m), or wind (8 km/h from 136°) is unfavorable. Consider other spots or wait for better conditions.
3.3m (10.8ft) swell from 183° (S) at 17s period
Poor alignment: Swell from 182° is 53° off optimal 235°, barely within workable range 210°-260°.
Too big: 3.0m exceeds maximum 1.8m. Risk of closeouts.
Moderate offshore: 11 km/h from 136° (SE). Still grooming but noticeable wind.
Poor conditions at Nipussi. Either swell direction (182°), size (3.0m), or wind (11 km/h from 136°) is unfavorable. Consider other spots or wait for better conditions.
3.0m (9.8ft) swell from 182° (S) at 16s period
Very low confidence (8-10 day forecast, conditions may change)
No alignment: Swell from 176° is outside workable range 210°-260°. Wrong swell direction for this spot.
Perfect period: 14s is at or above ideal 14s. Long-period groundswell with maximum power.
Moderate offshore: 10 km/h from 142° (SE). Still grooming but noticeable wind.
Poor conditions at Nipussi. Either swell direction (176°), size (2.4m), or wind (10 km/h from 142°) is unfavorable. Consider other spots or wait for better conditions.
2.4m (7.9ft) swell from 176° (S) at 14s period
Poor alignment: Swell from 181° is 54° off optimal 235°, barely within workable range 210°-260°.
Too big: 2.0m exceeds maximum 1.8m. Risk of closeouts.
Moderate offshore: 10 km/h from 141° (SE). Still grooming but noticeable wind.
+6 points: Multiple days of offshore wind have groomed the ocean surface, creating ultra-clean conditions.
Surfable but not special at Nipussi. The 2.0m swell from 181° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
2.0m (6.6ft) swell from 181° (S) at 15s period
Open-Meteo Weather API (wind/weather data)