Surf Forecast for Maresias
type: Dataset
description: 10-day surf forecast with Strike Scores for Maresias, São Sebastião, SP, Brazil
about: Maresias
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -23.7833
    longitude: -45.55
  description: Maresias is Gabriel Medina's home break and arguably the most high-performance beach break in Brazil. The wave breaks over shifting sandbars that produce world-class barrels when autumn and winter swells push up from the south. The "Canto do Moreira" section at the south end is the most famous peak, where Medina grew up learning the airs and tubes that would make him a two-time world champion. The nightlife here is legendary, making it a complete surf trip destination.
summary:
  best day:
    date: 2026-08-08
    score: 69
    category: Good
    explanation: Best day in the forecast: 2026-08-08 with a score of 69/100 (Good)
  firing days count: 0
  overall recommendation: Fair recommendation: Maresias has 4 Good days but no Firing days. Decent for a local session.
forecasts:
  date: 2026-08-04
  day index: 0
  strike score:
    final score: 30
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 6
        out of: 25
        explanation: Poor alignment: Swell from 136° is 44° off optimal 180°, barely within workable range 157°-225°.
      swell size:
        score: 2
        out of: 25
        explanation: Too small: 0.7m is below minimum 1.2m. Waves will be weak/mushy.
      swell period:
        score: 14
        out of: 25
        explanation: Moderate period: 12s meets minimum 10s but below ideal 14s. Some groundswell energy present.
      wind:
        score: 20
        out of: 25
        explanation: Onshore/cross-shore: 7 km/h from 65° (ENE). Destroying wave quality. Offshore range: 315°-45°.
    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 Maresias. Either swell direction (136°), size (0.7m), or wind (7 km/h from 65°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.7
      height ft: 2.3
      direction degrees: 136
      direction cardinal: SE
      period s: 12
      explanation: 0.7m (2.3ft) swell from 136° (SE) at 12s period
    wind:
      speed kmh: 7
      speed mph: 4.3
      direction degrees: 65
      direction cardinal: ENE
      explanation: 7 km/h (4 mph) from 65° (ENE)
    secondary swell:
      height m: 0.4
      direction degrees: 135
      direction cardinal: SE
      period s: 9
forecasts:
  date: 2026-08-05
  day index: 1
  strike score:
    final score: 54
    category: Fair
    category emoji: 😐
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 15
        out of: 25
        explanation: Moderate alignment: Swell from 164° is 16° off optimal 180°, workable but not ideal.
      swell size:
        score: 5
        out of: 25
        explanation: Too small: 1.1m is below minimum 1.2m. Waves will be weak/mushy.
      swell period:
        score: 14
        out of: 25
        explanation: Moderate period: 12s meets minimum 10s but below ideal 14s. Some groundswell energy present.
      wind:
        score: 23
        out of: 25
        explanation: Onshore/cross-shore: 5 km/h from 49° (NE). Destroying wave quality. Offshore range: 315°-45°.
    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: Surfable but not special at Maresias. The 1.1m swell from 164° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
  conditions:
    swell:
      height m: 1.1
      height ft: 3.6
      direction degrees: 164
      direction cardinal: SSE
      period s: 12
      explanation: 1.1m (3.6ft) swell from 164° (SSE) at 12s period
    wind:
      speed kmh: 5
      speed mph: 3.1
      direction degrees: 49
      direction cardinal: NE
      explanation: 5 km/h (3 mph) from 49° (NE)
forecasts:
  date: 2026-08-06
  day index: 2
  strike score:
    final score: 0
    category: Poor
    category emoji: 💤
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 0
        out of: 25
        explanation: No alignment: Swell from 95° is outside workable range 157°-225°. Wrong swell direction for this spot.
      swell size:
        score: 3
        out of: 25
        explanation: Too small: 1.0m is below minimum 1.2m. Waves will be weak/mushy.
      swell period:
        score: 4
        out of: 25
        explanation: Short period: 9s is below minimum 10s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 16
        out of: 25
        explanation: Onshore/cross-shore: 9 km/h from 54° (NE). Destroying wave quality. Offshore range: 315°-45°.
    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 Maresias. Either swell direction (95°), size (1.0m), or wind (9 km/h from 54°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1
      height ft: 3.3
      direction degrees: 95
      direction cardinal: E
      period s: 9
      explanation: 1.0m (3.3ft) swell from 95° (E) at 9s period
    wind:
      speed kmh: 9
      speed mph: 5.6
      direction degrees: 54
      direction cardinal: NE
      explanation: 9 km/h (6 mph) from 54° (NE)
forecasts:
  date: 2026-08-07
  day index: 3
  strike score:
    final score: 0
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 0
        out of: 25
        explanation: No alignment: Swell from 91° is outside workable range 157°-225°. Wrong swell direction for this spot.
      swell size:
        score: 2
        out of: 25
        explanation: Too small: 0.8m is below minimum 1.2m. Waves will be weak/mushy.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 8s is below minimum 10s. Windswell-dominated (choppy, weak waves).
    summary: Poor conditions at Maresias. Either swell direction (91°), size (0.8m), or wind (8 km/h from 77°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T04:15:31.689Z
temporal coverage: 2026-08-04/2026-08-13
data sources: Open-Meteo Marine API (swell/wave data)
data sources: Open-Meteo Weather API (wind/weather data)

score: 18
out of: 25
explanation: Onshore/cross-shore: 8 km/h from 77° (ENE). Destroying wave quality. Offshore range: 315°-45°.

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: 0.8
  height ft: 2.6
  direction degrees: 91
  direction cardinal: E
  period s: 8
  explanation: 0.8m (2.6ft) swell from 91° (E) at 8s period
wind:
  speed kmh: 8
  speed mph: 5.0
  direction degrees: 77
  direction cardinal: ENE
  explanation: 8 km/h (5 mph) from 77° (ENE)

date: 2026-08-08
day index: 4
strike score:
  final score: 69
  category: Good
  category emoji: ✅
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 23
      out of: 25
      explanation: Good alignment: Swell from 183° is 3° off optimal 180°, still within prime range.
    swell size:
      score: 15
      out of: 25
      explanation: Marginal size: 2.1m is 0.3m from ideal 2.4m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 14s is at or above ideal 14s. Long-period groundswell with maximum power.
    wind:
      score: 11
      out of: 25
      explanation: Onshore/cross-shore: 11 km/h from 47° (NE). Destroying wave quality. Offshore range: 315°-45°.
  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: Good surfable conditions at Maresias. 2.1m swell from 183° with manageable wind. Solid session guaranteed.
conditions:
  swell:
    height m: 2.1
    height ft: 6.9
    direction degrees: 183
    direction cardinal: S
    period s: 14
    explanation: 2.1m (6.9ft) swell from 183° (S) at 14s period
  wind:
    speed kmh: 11
    speed mph: 6.8
    direction degrees: 47
    direction cardinal: NE
    explanation: 11 km/h (7 mph) from 47° (NE)

date: 2026-08-09
day index: 5
strike score:
  final score: 65
  category: Good
  category emoji: ✅
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 24
      out of: 25
      explanation: Perfect alignment: Swell from 179° is within 5° of optimal 180°.
    swell size:
      score: 12
      out of: 25
      explanation: Marginal size: 1.8m is 0.6m from ideal 2.4m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 14s is at or above ideal 14s. Long-period groundswell with maximum power.
    wind:
      score: 9
      out of: 25
      explanation: Onshore/cross-shore: 11 km/h from 249° (WSW). Destroying wave quality. Offshore range: 315°-45°.
  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: Good surfable conditions at Maresias. 1.8m swell from 179° with manageable wind. Solid session guaranteed.
conditions:
  swell:
    height m: 1.8
    height ft: 5.9
    direction degrees: 179
    direction cardinal: S
    period s: 14
    explanation: 1.8m (5.9ft) swell from 179° (S) at 14s period
  wind:
    speed kmh: 11
    speed mph: 6.8
    direction degrees: 249
    direction cardinal: WSW
    explanation: 11 km/h (7 mph) from 249° (WSW)

date: 2026-08-10
day index: 6
strike score:
  final score: 59
  category: Fair
  category emoji: 😐
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 23
      out of: 25
      explanation: Good alignment: Swell from 177° is 3° off optimal 180°, still within prime range.
    swell size:
      score: 14
      out of: 25
      explanation: Marginal size: 2.0m is 0.4m from ideal 2.4m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 12s meets minimum 10s but below ideal 14s. Some groundswell energy present.
    wind:
      score: 11
      out of: 25
      explanation: Onshore/cross-shore: 9 km/h from 157° (SSE). Destroying wave quality. Offshore range: 315°-45°.
  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: Surfable but not special at Maresias. The 2.0m swell from 177° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 2
    height ft: 6.6
    direction degrees: 177
    direction cardinal: S
    period s: 12
    explanation: 2.0m (6.6ft) swell from 177° (S) at 12s period
  wind:
    speed kmh: 9
    speed mph: 5.6
    direction degrees: 157
    direction cardinal: SSE
    explanation: 9 km/h (6 mph) from 157° (SSE)
  secondary swell:
    height m: 0.8
    direction degrees: 174
    direction cardinal: S
    period s: 10
  windswell:
    height m: 0.3
    period s: 2
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-11
day index: 7
strike score:
  final score: 66
  category: Good
  category emoji: ✅
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 20
      out of: 25
      explanation: Good alignment: Swell from 187° is 7° off optimal 180°, still within prime range.
    swell size:
      score: 21
      out of: 25
      explanation: Good size: 3.0m is within 15% of ideal 2.4m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 14s is at or above ideal 14s. Long-period groundswell with maximum power.
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 12 km/h from 181° (S). Destroying wave quality. Offshore range: 315°-45°.
  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: Good surfable conditions at Maresias. 3.0m swell from 187° with manageable wind. Solid session guaranteed.
conditions:
  swell:
    height m: 3
    height ft: 9.8
    direction degrees: 187
    direction cardinal: S
    period s: 14
    explanation: 3.0m (9.8ft) swell from 187° (S) at 14s period
  wind:
    speed kmh: 12
    speed mph: 7.5
    direction degrees: 181
    direction cardinal: S
    explanation: 12 km/h (7 mph) from 181° (S)

date: 2026-08-12
day index: 8
strike score:
  final score: 66
  category: Good
  category emoji: ✅
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 19
      out of: 25
      explanation: Moderate alignment: Swell from 189° is 9° off optimal 180°, workable but not ideal.
    swell size:
      score: 14
      out of: 25
      explanation: Marginal size: 2.0m is 0.4m from ideal 2.4m.
    swell period:
      score: 8
      out of: 25
      explanation: Moderate period: 11s meets minimum 10s but below ideal 14s. Some groundswell energy present.
    wind:
      score: 25
      out of: 25
      explanation: Onshore/cross-shore: 4 km/h from 58° (ENE). Destroying wave quality. Offshore range: 315°-45°.
  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: Good surfable conditions at Maresias. 2.0m swell from 189° with manageable wind. Solid session guaranteed.
conditions:
  swell:
    height m: 2
    height ft: 6.6
    direction degrees: 189
    direction cardinal: S
    period s: 11
    explanation: 2.0m (6.6ft) swell from 189° (S) at 11s period
  wind:
    speed kmh: 4
    speed mph: 2.5
    direction degrees: 58
    direction cardinal: ENE
    explanation: 4 km/h (2 mph) from 58° (ENE)
  secondary swell:
    height m: 0.5
    direction degrees: 188
    direction cardinal: S
    period s: 6

date: 2026-08-13
day index: 9
strike score:
  final score: 62
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 24
      out of: 25
      explanation: Perfect alignment: Swell from 181° is within 5° of optimal 180°.
    swell size:
      score: 15
      out of: 25
      explanation: Marginal size: 2.1m is 0.3m from ideal 2.4m.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 13s is 93% of ideal 14s. Clean, powerful groundswell.
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 14 km/h from 51° (NE). Destroying wave quality. Offshore range: 315°-45°.
  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: Surfable but not special at Maresias. The 2.1m swell from 181° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 2.1
    height ft: 6.9
    direction degrees: 181
    direction cardinal: S
    period s: 13
    explanation: 2.1m (6.9ft) swell from 181° (S) at 13s period
  wind:
    speed kmh: 14
    speed mph: 8.7
    direction degrees: 51
    direction cardinal: NE
    explanation: 14 km/h (9 mph) from 51° (NE)

Strike Mission
type: Organization