Surf Forecast for Belharra
type: Dataset
description: 10-day surf forecast with Strike Scores for Belharra, Saint-Jean-de-Luz, France
about: Belharra
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: 43.4
    longitude: -1.68
  description: Belharra is France's premier big wave—a deepwater reef 2.5 kilometers offshore from Saint-Jean-de-Luz that only wakes up during the most massive North Atlantic storms. The wave requires tow-in assistance and breaks maybe a handful of days per winter; some years it doesn't break at all. When it does, Belharra produces giant, powerful A-frames in the 40-60 foot range. The Basque Country setting and the rarity of rideable swells make a Belharra session a career highlight for Europe's big wave elite.
summary:
  best day:
    date: 2026-08-05
    score: 15
    category: Poor
    explanation: Best day in the forecast: 2026-08-05 with a score of 15/100 (Poor)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 11/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-05
  day index: 0
  strike score:
    final score: 15
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 20
        out of: 25
        explanation: Good alignment: Swell from 304° is 6° off optimal 310°, still within prime range.
      swell size:
        score: 0
        out of: 25
        explanation: Too small: 0.7m is below minimum 6.0m. Waves will be weak/mushy.
      swell period:
        score: 0
        out of: 25
        explanation: Short period: 7s is below minimum 16s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 13
        out of: 25
        explanation: Onshore/cross-shore: 8 km/h from 312° (NW). Destroying wave quality. Offshore range: 70°-150°.
    adjustments:
      wind history:
        adjustment: 0
        groomed: false
        morning sickness: false
        explanation: No significant wind history adjustment.
      windswell penalty:
        adjustment: 0
        windswell degraded: false
        explanation: Groundswell-dominant conditions (clean, long-period waves).
      secondary swell bonus:
        adjustment: 0
        explanation: No secondary swell bonus.
    summary: Poor conditions at Belharra. Either swell direction (304°), size (0.7m), or wind (8 km/h from 312°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.7
      height ft: 2.3
      direction degrees: 304
      direction cardinal: NW
      period s: 7
      peak period s: 7
      explanation: 0.7m (2.3ft) swell from 304° (NW) at 7s period
    wind:
      speed kmh: 8
      speed mph: 5.0
      direction degrees: 312
      direction cardinal: NW
      explanation: 8 km/h (5 mph) from 312° (NW)
forecasts:
  date: 2026-08-06
  day index: 1
  strike score:
    final score: 2
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 20
        out of: 25
        explanation: Good alignment: Swell from 316° is 6° off optimal 310°, still within prime range.
      swell size:
        score: 0
        out of: 25
        explanation: Too small: 1.2m is below minimum 6.0m. Waves will be weak/mushy.
      swell period:
        score: 0
        out of: 25
        explanation: Short period: 8s is below minimum 16s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 3
        out of: 25
        explanation: Onshore/cross-shore: 14 km/h from 13° (NNE). Destroying wave quality. Offshore range: 70°-150°.
    adjustments:
      wind history:
        adjustment: 0
        groomed: false
        morning sickness: false
        explanation: No significant wind history adjustment.
      windswell penalty:
        adjustment: 0
        windswell degraded: false
        explanation: Groundswell-dominant conditions (clean, long-period waves).
      secondary swell bonus:
        adjustment: 0
        explanation: No secondary swell bonus.
    summary: Poor conditions at Belharra. Either swell direction (316°), size (1.2m), or wind (14 km/h from 13°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1.2
      height ft: 3.9
      direction degrees: 316
      direction cardinal: NW
      period s: 8
      peak period s: 8.2
      explanation: 1.2m (3.9ft) swell from 316° (NW) at 8.2s period
    wind:
      speed kmh: 14
      speed mph: 8.7
      direction degrees: 13
      direction cardinal: NNE
      explanation: 14 km/h (9 mph) from 13° (NNE)
forecasts:
  date: 2026-08-07
  day index: 2
  strike score:
    final score: 4
    category: Poor
    category emoji: 💤
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 13
        out of: 25
        explanation: Moderate alignment: Swell from 330° is 20° off optimal 310°, workable but not ideal.
      swell size:
        score: 0
        out of: 25
        explanation: Too small: 1.0m is below minimum 6.0m. Waves will be weak/mushy.
      swell period:
        score: 0
        out of: 25
        explanation: Short period: 7s is below minimum 16s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 7
        out of: 25
        explanation: Onshore/cross-shore: 11 km/h from 305° (NW). Destroying wave quality. Offshore range: 70°-150°.
    adjustments:
      wind history:
        adjustment: 0
        groomed: false
        morning sickness: false
        explanation: No significant wind history adjustment.
      windswell penalty:
        adjustment: 0
        windswell degraded: false
        explanation: Groundswell-dominant conditions (clean, long-period waves).
      secondary swell bonus:
        adjustment: 0
        explanation: No secondary swell bonus.
    summary: Poor conditions at Belharra. Either swell direction (330°), size (1.0m), or wind (11 km/h from 305°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1
      height ft: 3.3
      direction degrees: 330
      direction cardinal: NNW
      period s: 7
      peak period s: 6.7
      explanation: 1.0m (3.3ft) swell from 330° (NNW) at 6.7s period
    wind:
      speed kmh: 11
      speed mph: 6.8
      direction degrees: 305
      direction cardinal: NW
      explanation: 11 km/h (7 mph) from 305° (NW)
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 6
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 10
        out of: 25
        explanation: Moderate alignment: Swell from 338° is 28° off optimal 310°, workable but not ideal.
      swell size:
        score: 0
        out of: 25
        explanation: Too small: 0.7m is below minimum 6.0m. Waves will be weak/mushy.
      swell period:
        score: 0
        out of: 25
        explanation: Short period: 6s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    summary: Poor conditions at Belharra. Either swell direction (338°), size (0.7m), or wind (9 km/h from 18°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T03:09:15.841Z
temporal coverage: 2026-08-05/2026-08-14
data sources: Open-Meteo Marine API (swell/wave data)
data sources: Open-Meteo Weather API (wind/weather data)

score: 12
out of: 25
explanation: Onshore/cross-shore: 9 km/h from 18° (NNE). Destroying wave quality. Offshore range: 70°-150°.

wind history:
  adjustment: 0
  groomed: false
  morning sickness: false
  explanation: No significant wind history adjustment.
windswell penalty:
  adjustment: 0
  windswell degraded: false
  explanation: Groundswell-dominant conditions (clean, long-period waves).
secondary swell bonus:
  adjustment: 0
  explanation: No secondary swell bonus.

swell:
  height m: 0.7
  height ft: 2.3
  direction degrees: 338
  direction cardinal: NNW
  period s: 6
  explanation: 0.7m (2.3ft) swell from 338° (NNW) at 6s period
wind:
  speed kmh: 9
  speed mph: 5.6
  direction degrees: 18
  direction cardinal: NNE
  explanation: 9 km/h (6 mph) from 18° (NNE)

date: 2026-08-09
day index: 4
strike score:
  final score: 15
  category: Poor
  category emoji: 💤
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 25
      out of: 25
      explanation: Perfect alignment: Swell from 310° is within 5° of optimal 310°.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 0.6m is below minimum 6.0m. Waves will be weak/mushy.
    swell period:
      score: 1
      out of: 25
      explanation: Short period: 10s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 14
      out of: 25
      explanation: Onshore/cross-shore: 8 km/h from 7° (N). Destroying wave quality. Offshore range: 70°-150°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    windswell penalty:
      adjustment: 0
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Belharra. Either swell direction (310°), size (0.6m), or wind (8 km/h from 7°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.6
    height ft: 2.0
    direction degrees: 310
    direction cardinal: NW
    period s: 10
    explanation: 0.6m (2.0ft) swell from 310° (NW) at 10s period
  wind:
    speed kmh: 8
    speed mph: 5.0
    direction degrees: 7
    direction cardinal: N
    explanation: 8 km/h (5 mph) from 7° (N)

date: 2026-08-10
day index: 5
strike score:
  final score: 15
  category: Poor
  category emoji: 💤
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 23
      out of: 25
      explanation: Good alignment: Swell from 312° is 2° off optimal 310°, still within prime range.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 0.8m is below minimum 6.0m. Waves will be weak/mushy.
    swell period:
      score: 1
      out of: 25
      explanation: Short period: 9s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 9
      out of: 25
      explanation: Onshore/cross-shore: 12 km/h from 50° (NE). Destroying wave quality. Offshore range: 70°-150°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    windswell penalty:
      adjustment: 0
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Belharra. Either swell direction (312°), size (0.8m), or wind (12 km/h from 50°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.8
    height ft: 2.6
    direction degrees: 312
    direction cardinal: NW
    period s: 9
    explanation: 0.8m (2.6ft) swell from 312° (NW) at 9s period
  wind:
    speed kmh: 12
    speed mph: 7.5
    direction degrees: 50
    direction cardinal: NE
    explanation: 12 km/h (7 mph) from 50° (NE)

date: 2026-08-11
day index: 6
strike score:
  final score: 15
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 20
      out of: 25
      explanation: Good alignment: Swell from 316° is 6° off optimal 310°, still within prime range.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 1.2m is below minimum 6.0m. Waves will be weak/mushy.
    swell period:
      score: 1
      out of: 25
      explanation: Short period: 10s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 16
      out of: 25
      explanation: Onshore/cross-shore: 9 km/h from 48° (NE). Destroying wave quality. Offshore range: 70°-150°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    windswell penalty:
      adjustment: 0
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Belharra. Either swell direction (316°), size (1.2m), or wind (9 km/h from 48°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.2
    height ft: 3.9
    direction degrees: 316
    direction cardinal: NW
    period s: 10
    explanation: 1.2m (3.9ft) swell from 316° (NW) at 10s period
  wind:
    speed kmh: 9
    speed mph: 5.6
    direction degrees: 48
    direction cardinal: NE
    explanation: 9 km/h (6 mph) from 48° (NE)

date: 2026-08-12
day index: 7
strike score:
  final score: 13
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 19
      out of: 25
      explanation: Moderate alignment: Swell from 318° is 8° off optimal 310°, workable but not ideal.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 0.9m is below minimum 6.0m. Waves will be weak/mushy.
    swell period:
      score: 1
      out of: 25
      explanation: Short period: 9s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 9
      out of: 25
      explanation: Onshore/cross-shore: 10 km/h from 283° (WNW). Destroying wave quality. Offshore range: 70°-150°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    windswell penalty:
      adjustment: 0
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Belharra. Either swell direction (318°), size (0.9m), or wind (10 km/h from 283°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.9
    height ft: 3.0
    direction degrees: 318
    direction cardinal: NW
    period s: 9
    explanation: 0.9m (3.0ft) swell from 318° (NW) at 9s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 283
    direction cardinal: WNW
    explanation: 10 km/h (6 mph) from 283° (WNW)
  secondary swell:
    height m: 0.5
    direction degrees: 303
    direction cardinal: WNW
    period s: 5

date: 2026-08-13
day index: 8
strike score:
  final score: 10
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 17
      out of: 25
      explanation: Moderate alignment: Swell from 299° is 11° off optimal 310°, workable but not ideal.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 1.0m is below minimum 6.0m. Waves will be weak/mushy.
    swell period:
      score: 1
      out of: 25
      explanation: Short period: 9s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 9
      out of: 25
      explanation: Onshore/cross-shore: 11 km/h from 353° (N). Destroying wave quality. Offshore range: 70°-150°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    windswell penalty:
      adjustment: 0
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Belharra. Either swell direction (299°), size (1.0m), or wind (11 km/h from 353°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 299
    direction cardinal: WNW
    period s: 9
    explanation: 1.0m (3.3ft) swell from 299° (WNW) at 9s period
  wind:
    speed kmh: 11
    speed mph: 6.8
    direction degrees: 353
    direction cardinal: N
    explanation: 11 km/h (7 mph) from 353° (N)

date: 2026-08-14
day index: 9
strike score:
  final score: 10
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 14
      out of: 25
      explanation: Moderate alignment: Swell from 293° is 17° off optimal 310°, workable but not ideal.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 0.5m is below minimum 6.0m. Waves will be weak/mushy.
    swell period:
      score: 0
      out of: 25
      explanation: Short period: 7s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 13
      out of: 25
      explanation: Onshore/cross-shore: 8 km/h from 321° (NW). Destroying wave quality. Offshore range: 70°-150°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    windswell penalty:
      adjustment: 0
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Belharra. Either swell direction (293°), size (0.5m), or wind (8 km/h from 321°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.5
    height ft: 1.6
    direction degrees: 293
    direction cardinal: WNW
    period s: 7
    explanation: 0.5m (1.6ft) swell from 293° (WNW) at 7s period
  wind:
    speed kmh: 8
    speed mph: 5.0
    direction degrees: 321
    direction cardinal: NW
    explanation: 8 km/h (5 mph) from 321° (NW)

Strike Mission
type: Organization