Surf Forecast for Itacoatiara
type: Dataset
description: 10-day surf forecast with Strike Scores for Itacoatiara, Niterói, RJ, Brazil
about: Itacoatiara
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -22.975
    longitude: -43.0333
  description: Itacoatiara is the most powerful wave in Rio de Janeiro state, a heavy beach break wedged between dramatic granite boulders on the coast of Niterói. The "Costão" section at the south end produces the hollowest barrels, fast lefts that barrel over shallow sand with impressive force. The spot has hosted international competitions and is known for producing some of Brazil's best tube riders. The setting is stunning, with Sugar Loaf-like rock formations framing the lineup.
summary:
  best day:
    date: 2026-08-05
    score: 51
    category: Fair
    explanation: Best day in the forecast: 2026-08-05 with a score of 51/100 (Fair)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 34/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-04
  day index: 0
  strike score:
    final score: 22
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 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 112°-180°.
      swell size:
        score: 3
        out of: 25
        explanation: Too small: 0.9m is below minimum 1.2m. Waves will be weak/mushy.
      swell period:
        score: 8
        out of: 25
        explanation: Moderate period: 11s meets minimum 10s but below ideal 14s. Some groundswell energy present.
      wind:
        score: 14
        out of: 25
        explanation: Onshore/cross-shore: 8 km/h from 104° (ESE). 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 Itacoatiara. Either swell direction (166°), size (0.9m), or wind (8 km/h from 104°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.9
      height ft: 3.0
      direction degrees: 166
      direction cardinal: SSE
      period s: 11
      explanation: 0.9m (3.0ft) swell from 166° (SSE) at 11s period
    wind:
      speed kmh: 8
      speed mph: 5.0
      direction degrees: 104
      direction cardinal: ESE
      explanation: 8 km/h (5 mph) from 104° (ESE)
    secondary swell:
      height m: 0.6
      direction degrees: 150
      direction cardinal: SSE
      period s: 10
forecasts:
  date: 2026-08-05
  day index: 1
  strike score:
    final score: 51
    category: Fair
    category emoji: 😐
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 5
        out of: 25
        explanation: Poor alignment: Swell from 182° is 47° off optimal 135°, barely within workable range 112°-180°.
      swell size:
        score: 8
        out of: 25
        explanation: Marginal size: 1.2m is 1.2m 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: 18
        out of: 25
        explanation: Onshore/cross-shore: 8 km/h from 57° (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: Surfable but not special at Itacoatiara. The 1.2m swell from 182° 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: 182
      direction cardinal: S
      period s: 13
      explanation: 1.2m (3.9ft) swell from 182° (S) at 13s period
    wind:
      speed kmh: 8
      speed mph: 5.0
      direction degrees: 57
      direction cardinal: ENE
      explanation: 8 km/h (5 mph) from 57° (ENE)
    secondary swell:
      height m: 0.9
      direction degrees: 106
      direction cardinal: ESE
      period s: 6
forecasts:
  date: 2026-08-06
  day index: 2
  strike score:
    final score: 30
    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 112°-180°.
      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: 25
        out of: 25
        explanation: Light offshore: 7 km/h from 16° (NNE). 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 Itacoatiara. Either swell direction (101°), size (1.0m), or wind (7 km/h from 16°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1
      height ft: 3.3
      direction degrees: 101
      direction cardinal: E
      period s: 9
      explanation: 1.0m (3.3ft) swell from 101° (E) at 9s period
    wind:
      speed kmh: 7
      speed mph: 4.3
      direction degrees: 16
      direction cardinal: NNE
      explanation: 7 km/h (4 mph) from 16° (NNE)
    secondary swell:
      height m: 0.6
      direction degrees: 176
      direction cardinal: S
      period s: 9
forecasts:
  date: 2026-08-07
  day index: 3
  strike score:
    final score: 16
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    summary: Poor conditions at Itacoatiara. Either swell direction (98°), size (0.9m), or wind (10 km/h from 321°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-04T23:52:54.424Z
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 112°-180°.
swell size:
  score: 3
  out of: 25
  explanation: Too small: 0.9m 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: 17
  out of: 25
  explanation: Moderate offshore: 10 km/h from 321° (NW). Still grooming but noticeable wind.

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: 0.9
  height ft: 3.0
  direction degrees: 98
  direction cardinal: E
  period s: 9
  explanation: 0.9m (3.0ft) swell from 98° (E) at 9s period
wind:
  speed kmh: 10
  speed mph: 6.2
  direction degrees: 321
  direction cardinal: NW
  explanation: 10 km/h (6 mph) from 321° (NW)
secondary swell:
  height m: 0.5
  direction degrees: 168
  direction cardinal: SSE
  period s: 9

date: 2026-08-08
day index: 4
strike score:
  final score: 18
  category: Poor
  category emoji: 💤
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 4
      out of: 25
      explanation: Poor alignment: Swell from 184° is 49° off optimal 135°, barely within workable range 112°-180°.
    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: 8
      out of: 25
      explanation: Moderate period: 11s meets minimum 10s but below ideal 14s. Some groundswell energy present.
    wind:
      score: 13
      out of: 25
      explanation: Onshore/cross-shore: 10 km/h from 90° (E). 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 Itacoatiara. Either swell direction (184°), size (1.1m), or wind (10 km/h from 90°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.1
    height ft: 3.6
    direction degrees: 184
    direction cardinal: S
    period s: 11
    explanation: 1.1m (3.6ft) swell from 184° (S) at 11s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 90
    direction cardinal: E
    explanation: 10 km/h (6 mph) from 90° (E)
  secondary swell:
    height m: 0.5
    direction degrees: 130
    direction cardinal: SE
    period s: 8

date: 2026-08-09
day index: 5
strike score:
  final score: 44
  category: Poor
  category emoji: 💤
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 1
      out of: 25
      explanation: Poor alignment: Swell from 191° is 56° off optimal 135°, barely within workable range 112°-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: 15
      out of: 25
      explanation: Onshore/cross-shore: 7 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: Poor conditions at Itacoatiara. Either swell direction (191°), size (1.8m), or wind (7 km/h from 181°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.8
    height ft: 5.9
    direction degrees: 191
    direction cardinal: S
    period s: 14
    explanation: 1.8m (5.9ft) swell from 191° (S) at 14s period
  wind:
    speed kmh: 7
    speed mph: 4.3
    direction degrees: 181
    direction cardinal: S
    explanation: 7 km/h (4 mph) from 181° (S)
  secondary swell:
    height m: 0.6
    direction degrees: 164
    direction cardinal: SSE
    period s: 10

date: 2026-08-10
day index: 6
strike score:
  final score: 37
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 4
      out of: 25
      explanation: Poor alignment: Swell from 185° is 50° off optimal 135°, barely within workable range 112°-180°.
    swell size:
      score: 13
      out of: 25
      explanation: Marginal size: 1.9m is 0.5m 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: 4
      out of: 25
      explanation: Onshore/cross-shore: 13 km/h from 192° (SSW). 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 Itacoatiara. Either swell direction (185°), size (1.9m), or wind (13 km/h from 192°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.9
    height ft: 6.2
    direction degrees: 185
    direction cardinal: S
    period s: 13
    explanation: 1.9m (6.2ft) swell from 185° (S) at 13s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 192
    direction cardinal: SSW
    explanation: 13 km/h (8 mph) from 192° (SSW)
  secondary swell:
    height m: 0.5
    direction degrees: 167
    direction cardinal: SSE
    period s: 11
  windswell:
    height m: 0.5
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-11
day index: 7
strike score:
  final score: 37
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 1
      out of: 25
      explanation: Poor alignment: Swell from 192° is 57° off optimal 135°, barely within workable range 112°-180°.
    swell size:
      score: 17
      out of: 25
      explanation: Marginal size: 2.3m is 0.1m 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: 13 km/h from 113° (ESE). 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 Itacoatiara. Either swell direction (192°), size (2.3m), or wind (13 km/h from 113°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.3
    height ft: 7.5
    direction degrees: 192
    direction cardinal: SSW
    period s: 13
    explanation: 2.3m (7.5ft) swell from 192° (SSW) at 13s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 113
    direction cardinal: ESE
    explanation: 13 km/h (8 mph) from 113° (ESE)
  secondary swell:
    height m: 0.6
    direction degrees: 116
    direction cardinal: ESE
    period s: 5
  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: 32
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 5
      out of: 25
      explanation: Poor alignment: Swell from 182° is 47° off optimal 135°, barely within workable range 112°-180°.
    swell size:
      score: 13
      out of: 25
      explanation: Marginal size: 1.9m is 0.5m 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: 5
      out of: 25
      explanation: Onshore/cross-shore: 13 km/h from 99° (E). 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 Itacoatiara. Either swell direction (182°), size (1.9m), or wind (13 km/h from 99°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.9
    height ft: 6.2
    direction degrees: 182
    direction cardinal: S
    period s: 12
    explanation: 1.9m (6.2ft) swell from 182° (S) at 12s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 99
    direction cardinal: E
    explanation: 13 km/h (8 mph) from 99° (E)
  secondary swell:
    height m: 1
    direction degrees: 175
    direction cardinal: S
    period s: 10
  windswell:
    height m: 0.5
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-13
day index: 9
strike score:
  final score: 49
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 3
      out of: 25
      explanation: Poor alignment: Swell from 186° is 51° off optimal 135°, barely within workable range 112°-180°.
    swell size:
      score: 19
      out of: 25
      explanation: Marginal size: 2.5m is 0.1m 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: 20
      out of: 25
      explanation: Onshore/cross-shore: 7 km/h from 50° (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 Itacoatiara. The 2.5m swell from 186° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 2.5
    height ft: 8.2
    direction degrees: 186
    direction cardinal: S
    period s: 12
    explanation: 2.5m (8.2ft) swell from 186° (S) at 12s period
  wind:
    speed kmh: 7
    speed mph: 4.3
    direction degrees: 50
    direction cardinal: NE
    explanation: 7 km/h (4 mph) from 50° (NE)
  secondary swell:
    height m: 0.9
    direction degrees: 101
    direction cardinal: E
    period s: 4
  windswell:
    height m: 0.3
    period s: 2
    explanation: Local wind-generated waves (choppy, short-period)

Strike Mission
type: Organization