Surf Forecast for Itamambuca
type: Dataset
description: 10-day surf forecast with Strike Scores for Itamambuca, Ubatuba, SP, Brazil
about: Itamambuca
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -23.4
    longitude: -45.0167
  description: Itamambuca is one of Ubatuba's premier waves and a regular competition venue on the Brazilian surf circuit. The rivermouth creates constantly shifting sandbars that produce powerful peaks with both lefts and rights. The beach can pick up swell from almost any direction, making it one of the most versatile spots on the São Paulo coast. The surrounding area is lush and tropical, with the river providing a natural boundary that keeps the vibe more relaxed than some of Brazil's more famous breaks.
summary:
  best day:
    date: 2026-08-09
    score: 63
    category: Fair
    explanation: Best day in the forecast: 2026-08-09 with a score of 63/100 (Fair)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 46/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-04
  day index: 0
  strike score:
    final score: 32
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 10
        out of: 25
        explanation: Moderate alignment: Swell from 107° is 28° off optimal 135°, workable but not ideal.
      swell size:
        score: 3
        out of: 25
        explanation: Too small: 0.7m is below minimum 0.9m. Waves will be weak/mushy.
      swell period:
        score: 6
        out of: 25
        explanation: Moderate period: 8s meets minimum 8s but below ideal 12s. Some groundswell energy present.
      wind:
        score: 22
        out of: 25
        explanation: Glassy: Wind speed 3 km/h (light/variable). Perfect mirror-like surface.
    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 Itamambuca. Either swell direction (107°), size (0.7m), or wind (3 km/h from 208°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.7
      height ft: 2.3
      direction degrees: 107
      direction cardinal: ESE
      period s: 8
      explanation: 0.7m (2.3ft) swell from 107° (ESE) at 8s period
    wind:
      speed kmh: 3
      speed mph: 1.9
      direction degrees: 208
      direction cardinal: SSW
      explanation: 3 km/h (2 mph) from 208° (SSW)
    secondary swell:
      height m: 0.4
      direction degrees: 162
      direction cardinal: SSE
      period s: 11
forecasts:
  date: 2026-08-05
  day index: 1
  strike score:
    final score: 36
    category: Poor
    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 119° is 16° off optimal 135°, workable but not ideal.
      swell size:
        score: 5
        out of: 25
        explanation: Too small: 0.8m is below minimum 0.9m. Waves will be weak/mushy.
      swell period:
        score: 6
        out of: 25
        explanation: Moderate period: 8s meets minimum 8s but below ideal 12s. Some groundswell energy present.
      wind:
        score: 18
        out of: 25
        explanation: Onshore/cross-shore: 5 km/h from 162° (SSE). Destroying wave quality. Offshore range: 270°-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 Itamambuca. Either swell direction (119°), size (0.8m), or wind (5 km/h from 162°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.8
      height ft: 2.6
      direction degrees: 119
      direction cardinal: ESE
      period s: 8
      explanation: 0.8m (2.6ft) swell from 119° (ESE) at 8s period
    wind:
      speed kmh: 5
      speed mph: 3.1
      direction degrees: 162
      direction cardinal: SSE
      explanation: 5 km/h (3 mph) from 162° (SSE)
    secondary swell:
      height m: 0.6
      direction degrees: 146
      direction cardinal: SE
      period s: 8
forecasts:
  date: 2026-08-06
  day index: 2
  strike score:
    final score: 33
    category: Poor
    category emoji: 💤
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 8
        out of: 25
        explanation: Poor alignment: Swell from 101° is 34° off optimal 135°, barely within workable range 95°-170°.
      swell size:
        score: 8
        out of: 25
        explanation: Marginal size: 0.9m is 0.8m from ideal 1.7m.
      swell period:
        score: 6
        out of: 25
        explanation: Moderate period: 8s meets minimum 8s but below ideal 12s. Some groundswell energy present.
      wind:
        score: 21
        out of: 25
        explanation: Light offshore: 7 km/h from 355° (N). Grooming the wave face beautifully.
    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 Itamambuca. Either swell direction (101°), size (0.9m), or wind (7 km/h from 355°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.9
      height ft: 3.0
      direction degrees: 101
      direction cardinal: E
      period s: 8
      explanation: 0.9m (3.0ft) swell from 101° (E) at 8s period
    wind:
      speed kmh: 7
      speed mph: 4.3
      direction degrees: 355
      direction cardinal: N
      explanation: 7 km/h (4 mph) from 355° (N)
    secondary swell:
      height m: 0.5
      direction degrees: 161
      direction cardinal: SSE
      period s: 8
forecasts:
  date: 2026-08-07
  day index: 3
  strike score:
    final score: 28
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    summary: Poor conditions at Itamambuca. Either swell direction (98°), size (0.8m), or wind (5 km/h from 147°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T00:34:39.220Z
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)

swell direction:
  score: 7
  out of: 25
  explanation: Poor alignment: Swell from 98° is 37° off optimal 135°, barely within workable range 95°-170°.
swell size:
  score: 5
  out of: 25
  explanation: Too small: 0.8m is below minimum 0.9m. Waves will be weak/mushy.
swell period:
  score: 6
  out of: 25
  explanation: Moderate period: 8s meets minimum 8s but below ideal 12s. Some groundswell energy present.
wind:
  score: 18
  out of: 25
  explanation: Onshore/cross-shore: 5 km/h from 147° (SSE). Destroying wave quality. Offshore range: 270°-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: 98
  direction cardinal: E
  period s: 8
  explanation: 0.8m (2.6ft) swell from 98° (E) at 8s period
wind:
  speed kmh: 5
  speed mph: 3.1
  direction degrees: 147
  direction cardinal: SSE
  explanation: 5 km/h (3 mph) from 147° (SSE)

date: 2026-08-08
day index: 4
strike score:
  final score: 51
  category: Fair
  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 138° is 3° off optimal 135°, still within prime range.
    swell size:
      score: 5
      out of: 25
      explanation: Too small: 0.8m is below minimum 0.9m. Waves will be weak/mushy.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 13s is at or above ideal 12s. Long-period groundswell with maximum power.
    wind:
      score: 18
      out of: 25
      explanation: Onshore/cross-shore: 5 km/h from 193° (SSW). Destroying wave quality. Offshore range: 270°-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 Itamambuca. The 0.8m swell from 138° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 0.8
    height ft: 2.6
    direction degrees: 138
    direction cardinal: SE
    period s: 13
    explanation: 0.8m (2.6ft) swell from 138° (SE) at 13s period
  wind:
    speed kmh: 5
    speed mph: 3.1
    direction degrees: 193
    direction cardinal: SSW
    explanation: 5 km/h (3 mph) from 193° (SSW)
  secondary swell:
    height m: 0.4
    direction degrees: 149
    direction cardinal: SSE
    period s: 8

date: 2026-08-09
day index: 5
strike score:
  final score: 63
  category: Fair
  category emoji: 😐
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 13
      out of: 25
      explanation: Moderate alignment: Swell from 116° is 19° off optimal 135°, workable but not ideal.
    swell size:
      score: 9
      out of: 25
      explanation: Marginal size: 1.0m is 0.7m from ideal 1.7m.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 11s is 92% of ideal 12s. Clean, powerful groundswell.
    wind:
      score: 18
      out of: 25
      explanation: Onshore/cross-shore: 5 km/h from 174° (S). Destroying wave quality. Offshore range: 270°-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 Itamambuca. The 1.0m swell from 116° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 116
    direction cardinal: ESE
    period s: 11
    explanation: 1.0m (3.3ft) swell from 116° (ESE) at 11s period
  wind:
    speed kmh: 5
    speed mph: 3.1
    direction degrees: 174
    direction cardinal: S
    explanation: 5 km/h (3 mph) from 174° (S)
  secondary swell:
    height m: 0.4
    direction degrees: 156
    direction cardinal: SSE
    period s: 10

date: 2026-08-10
day index: 6
strike score:
  final score: 61
  category: Fair
  category emoji: 😐
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 9
      out of: 25
      explanation: Poor alignment: Swell from 166° is 31° off optimal 135°, barely within workable range 95°-170°.
    swell size:
      score: 9
      out of: 25
      explanation: Marginal size: 1.0m is 0.7m from ideal 1.7m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 13s is at or above ideal 12s. Long-period groundswell with maximum power.
    wind:
      score: 18
      out of: 25
      explanation: Onshore/cross-shore: 6 km/h from 209° (SSW). Destroying wave quality. Offshore range: 270°-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 Itamambuca. The 1.0m swell from 166° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 166
    direction cardinal: SSE
    period s: 13
    explanation: 1.0m (3.3ft) swell from 166° (SSE) at 13s period
  wind:
    speed kmh: 6
    speed mph: 3.7
    direction degrees: 209
    direction cardinal: SSW
    explanation: 6 km/h (4 mph) from 209° (SSW)
  secondary swell:
    height m: 0.5
    direction degrees: 180
    direction cardinal: S
    period s: 9

date: 2026-08-11
day index: 7
strike score:
  final score: 50
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 22
      out of: 25
      explanation: Good alignment: Swell from 139° is 4° off optimal 135°, still within prime range.
    swell size:
      score: 10
      out of: 25
      explanation: Marginal size: 1.1m is 0.6m from ideal 1.7m.
    swell period:
      score: 8
      out of: 25
      explanation: Moderate period: 9s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 16
      out of: 25
      explanation: Onshore/cross-shore: 6 km/h from 111° (ESE). Destroying wave quality. Offshore range: 270°-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 Itamambuca. The 1.1m swell from 139° 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: 139
    direction cardinal: SE
    period s: 9
    explanation: 1.1m (3.6ft) swell from 139° (SE) at 9s period
  wind:
    speed kmh: 6
    speed mph: 3.7
    direction degrees: 111
    direction cardinal: ESE
    explanation: 6 km/h (4 mph) from 111° (ESE)
  secondary swell:
    height m: 0.4
    direction degrees: 169
    direction cardinal: S
    period s: 10
  windswell:
    height m: 0.3
    period s: 2
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-12
day index: 8
strike score:
  final score: 52
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 9
      out of: 25
      explanation: Poor alignment: Swell from 167° is 32° off optimal 135°, barely within workable range 95°-170°.
    swell size:
      score: 9
      out of: 25
      explanation: Marginal size: 1.0m is 0.7m from ideal 1.7m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 20
      out of: 25
      explanation: Onshore/cross-shore: 4 km/h from 183° (S). Destroying wave quality. Offshore range: 270°-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 Itamambuca. The 1.0m swell from 167° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 167
    direction cardinal: SSE
    period s: 10
    explanation: 1.0m (3.3ft) swell from 167° (SSE) at 10s period
  wind:
    speed kmh: 4
    speed mph: 2.5
    direction degrees: 183
    direction cardinal: S
    explanation: 4 km/h (2 mph) from 183° (S)
  secondary swell:
    height m: 0.6
    direction degrees: 145
    direction cardinal: SE
    period s: 8

date: 2026-08-13
day index: 9
strike score:
  final score: 52
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 8
      out of: 25
      explanation: Poor alignment: Swell from 168° is 33° off optimal 135°, barely within workable range 95°-170°.
    swell size:
      score: 11
      out of: 25
      explanation: Marginal size: 1.2m is 0.5m from ideal 1.7m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 17
      out of: 25
      explanation: Onshore/cross-shore: 6 km/h from 181° (S). Destroying wave quality. Offshore range: 270°-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 Itamambuca. The 1.2m swell from 168° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 1.2
    height ft: 3.9
    direction degrees: 168
    direction cardinal: SSE
    period s: 10
    explanation: 1.2m (3.9ft) swell from 168° (SSE) at 10s period
  wind:
    speed kmh: 6
    speed mph: 3.7
    direction degrees: 181
    direction cardinal: S
    explanation: 6 km/h (4 mph) from 181° (S)
  secondary swell:
    height m: 0.5
    direction degrees: 166
    direction cardinal: SSE
    period s: 12

Strike Mission
type: Organization