Surf Forecast for St Clair
type: Dataset
description: 10-day surf forecast with Strike Scores for St Clair, Dunedin, New Zealand
about: St Clair
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -45.9167
    longitude: 170.4833
  description: St Clair is cold water surfing at its most rewarding—Dunedin's main beach break exposed to the roaring forties, where consistent southern swells meet dedicated locals in 5mm wetsuits and booties. The wave offers both beach break peaks and a right-hand rock point section, providing variety for all conditions. What St Clair lacks in tropical warmth it compensates with wild beauty: the dramatic Otago coastline, the Southern Alps as a distant backdrop, and a surf community forged in conditions that would send fair-weather surfers running. This is New Zealand's deep south, where the waves are cold but the stoke runs hot.
summary:
  best day:
    date: 2026-08-07
    score: 78
    category: Good
    explanation: Best day in the forecast: 2026-08-07 with a score of 78/100 (Good)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 45/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-05
  day index: 0
  strike score:
    final score: 41
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 17
        out of: 25
        explanation: Moderate alignment: Swell from 169° is 11° off optimal 180°, workable but not ideal.
      swell size:
        score: 6
        out of: 25
        explanation: Too big: 3.2m exceeds maximum 2.5m. Risk of closeouts.
      swell period:
        score: 14
        out of: 25
        explanation: Moderate period: 12s meets minimum 10s but below ideal 14s. Some groundswell energy present.
      wind:
        score: 16
        out of: 25
        explanation: Onshore/cross-shore: 9 km/h from 270° (W). Destroying wave quality. Offshore range: 320°-40°.
    adjustments:
      wind history:
        adjustment: -17
        groomed: false
        morning sickness: true
        explanation: -17 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
      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 St Clair. Either swell direction (169°), size (3.2m), or wind (9 km/h from 270°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 3.2
      height ft: 10.5
      direction degrees: 169
      direction cardinal: S
      period s: 12
      explanation: 3.2m (10.5ft) swell from 169° (S) at 12s period
    wind:
      speed kmh: 9
      speed mph: 5.6
      direction degrees: 270
      direction cardinal: W
      explanation: 9 km/h (6 mph) from 270° (W)
forecasts:
  date: 2026-08-06
  day index: 1
  strike score:
    final score: 67
    category: Good
    category emoji: ✅
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 22
        out of: 25
        explanation: Good alignment: Swell from 176° is 4° off optimal 180°, still within prime range.
      swell size:
        score: 24
        out of: 25
        explanation: Perfect size: 1.9m is at the sweet spot (ideal: 1.6m).
      swell period:
        score: 6
        out of: 25
        explanation: Moderate period: 10s meets minimum 10s but below ideal 14s. Some groundswell energy present.
      wind:
        score: 23
        out of: 25
        explanation: Light offshore: 6 km/h from 32° (NNE). Grooming the wave face beautifully.
    adjustments:
      wind history:
        adjustment: -11
        groomed: false
        morning sickness: true
        explanation: -11 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
      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 St Clair. 1.9m swell from 176° with manageable wind. Solid session guaranteed.
  conditions:
    swell:
      height m: 1.9
      height ft: 6.2
      direction degrees: 176
      direction cardinal: S
      period s: 10
      explanation: 1.9m (6.2ft) swell from 176° (S) at 10s period
    wind:
      speed kmh: 6
      speed mph: 3.7
      direction degrees: 32
      direction cardinal: NNE
      explanation: 6 km/h (4 mph) from 32° (NNE)
    secondary swell:
      height m: 0.5
      direction degrees: 146
      direction cardinal: SE
      period s: 11
forecasts:
  date: 2026-08-07
  day index: 2
  strike score:
    final score: 78
    category: Good
    category emoji: ✅
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 20
        out of: 25
        explanation: Good alignment: Swell from 173° is 7° off optimal 180°, still within prime range.
      swell size:
        score: 22
        out of: 25
        explanation: Good size: 1.8m is within 15% of ideal 1.6m.
      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: Moderate offshore: 10 km/h from 24° (NNE). Still grooming but noticeable wind.
    adjustments:
      wind history:
        adjustment: -4
        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 St Clair. 1.8m swell from 173° with manageable wind. Solid session guaranteed.
  conditions:
    swell:
      height m: 1.8
      height ft: 5.9
      direction degrees: 173
      direction cardinal: S
      period s: 12
      explanation: 1.8m (5.9ft) swell from 173° (S) at 12s period
    wind:
      speed kmh: 10
      speed mph: 6.2
      direction degrees: 24
      direction cardinal: NNE
      explanation: 10 km/h (6 mph) from 24° (NNE)
    secondary swell:
      height m: 0.4
      direction degrees: 69
      direction cardinal: ENE
      period s: 4
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 57
    category: Fair
    category emoji: 😐
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 12
        out of: 25
        explanation: Moderate alignment: Swell from 158° is 22° off optimal 180°, workable but not ideal.
      swell size:
        score: 12
        out of: 25
        explanation: Marginal size: 1.1m is 0.4m from ideal 1.6m.
    summary: Surfable but not special at St Clair. The 1.1m swell from 158° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
provider: Strike Mission
date published: 2026-08-05T03:09:21.501Z
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: 6
out of: 25
explanation: Moderate period: 10s meets minimum 10s but below ideal 14s. Some groundswell energy present.

score: 24
out of: 25
explanation: Light offshore: 7 km/h from 24° (NNE). Grooming the wave face beautifully.

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: 1.1
  height ft: 3.6
  direction degrees: 158
  direction cardinal: SSE
  period s: 10
  explanation: 1.1m (3.6ft) swell from 158° (SSE) at 10s period
wind:
  speed kmh: 7
  speed mph: 4.3
  direction degrees: 24
  direction cardinal: NNE
  explanation: 7 km/h (4 mph) from 24° (NNE)

date: 2026-08-09
day index: 4
strike score:
  final score: 50
  category: Fair
  category emoji: 😐
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 1
      out of: 25
      explanation: Poor alignment: Swell from 124° is 56° off optimal 180°, barely within workable range 150°-220°.
    swell size:
      score: 18
      out of: 25
      explanation: Marginal size: 1.6m is 0.1m from ideal 1.6m.
    swell period:
      score: 6
      out of: 25
      explanation: Moderate period: 10s meets minimum 10s but below ideal 14s. Some groundswell energy present.
    wind:
      score: 25
      out of: 25
      explanation: Light offshore: 4 km/h from 27° (NNE). Grooming the wave face beautifully.
  adjustments:
    wind history:
      adjustment: 6
      groomed: true
      morning sickness: false
      explanation: +6 points: Multiple days of offshore wind have groomed the ocean surface, creating ultra-clean conditions.
    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 St Clair. The 1.6m swell from 124° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 1.6
    height ft: 5.2
    direction degrees: 124
    direction cardinal: SE
    period s: 10
    explanation: 1.6m (5.2ft) swell from 124° (SE) at 10s period
  wind:
    speed kmh: 4
    speed mph: 2.5
    direction degrees: 27
    direction cardinal: NNE
    explanation: 4 km/h (2 mph) from 27° (NNE)
  secondary swell:
    height m: 0.5
    direction degrees: 205
    direction cardinal: SSW
    period s: 11

date: 2026-08-10
day index: 5
strike score:
  final score: 51
  category: Fair
  category emoji: 😐
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 5
      out of: 25
      explanation: Poor alignment: Swell from 133° is 47° off optimal 180°, barely within workable range 150°-220°.
    swell size:
      score: 24
      out of: 25
      explanation: Perfect size: 1.9m is at the sweet spot (ideal: 1.6m).
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 9s is below minimum 10s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 18
      out of: 25
      explanation: Moderate offshore: 18 km/h from 24° (NNE). Still grooming but noticeable wind.
  adjustments:
    wind history:
      adjustment: 4
      groomed: true
      morning sickness: false
      explanation: +4 points: Multiple days of offshore wind have groomed the ocean surface, creating ultra-clean conditions.
    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 St Clair. The 1.9m swell from 133° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 1.9
    height ft: 6.2
    direction degrees: 133
    direction cardinal: SE
    period s: 9
    explanation: 1.9m (6.2ft) swell from 133° (SE) at 9s period
  wind:
    speed kmh: 18
    speed mph: 11.2
    direction degrees: 24
    direction cardinal: NNE
    explanation: 18 km/h (11 mph) from 24° (NNE)
  secondary swell:
    height m: 0.4
    direction degrees: 198
    direction cardinal: SSW
    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: 6
strike score:
  final score: 0
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 0
      out of: 25
      explanation: No alignment: Swell from 108° is outside workable range 150°-220°. Wrong swell direction for this spot.
    swell size:
      score: 14
      out of: 25
      explanation: Marginal size: 1.3m is 0.3m from ideal 1.6m.
    swell period:
      score: 2
      out of: 25
      explanation: Short period: 8s is below minimum 10s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 2
      out of: 25
      explanation: Onshore/cross-shore: 23 km/h from 41° (NE). Destroying wave quality. Offshore range: 320°-40°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    windswell penalty:
      adjustment: -5
      windswell degraded: true
      explanation: -5 points: Short-period windswell is present, creating choppy, disorganized conditions.
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at St Clair. Either swell direction (108°), size (1.3m), or wind (23 km/h from 41°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.3
    height ft: 4.3
    direction degrees: 108
    direction cardinal: ESE
    period s: 8
    explanation: 1.3m (4.3ft) swell from 108° (ESE) at 8s period
  wind:
    speed kmh: 23
    speed mph: 14.3
    direction degrees: 41
    direction cardinal: NE
    explanation: 23 km/h (14 mph) from 41° (NE)
  windswell:
    height m: 1
    period s: 4
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-12
day index: 7
strike score:
  final score: 29
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 0
      out of: 25
      explanation: No alignment: Swell from 80° is outside workable range 150°-220°. Wrong swell direction for this spot.
    swell size:
      score: 23
      out of: 25
      explanation: Good size: 2.0m is within 15% of ideal 1.6m.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 9s is below minimum 10s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 24
      out of: 25
      explanation: Moderate offshore: 14 km/h from 21° (NNE). Still grooming but noticeable wind.
  adjustments:
    wind history:
      adjustment: -10
      groomed: false
      morning sickness: true
      explanation: -10 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
    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 St Clair. Either swell direction (80°), size (2.0m), or wind (14 km/h from 21°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2
    height ft: 6.6
    direction degrees: 80
    direction cardinal: E
    period s: 9
    explanation: 2.0m (6.6ft) swell from 80° (E) at 9s period
  wind:
    speed kmh: 14
    speed mph: 8.7
    direction degrees: 21
    direction cardinal: NNE
    explanation: 14 km/h (9 mph) from 21° (NNE)
  secondary swell:
    height m: 0.6
    direction degrees: 80
    direction cardinal: E
    period s: 6

date: 2026-08-13
day index: 8
strike score:
  final score: 23
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 0
      out of: 25
      explanation: No alignment: Swell from 74° is outside workable range 150°-220°. Wrong swell direction for this spot.
    swell size:
      score: 14
      out of: 25
      explanation: Marginal size: 1.3m is 0.3m from ideal 1.6m.
    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: 9 km/h from 350° (N). Grooming the wave face beautifully.
  adjustments:
    wind history:
      adjustment: -7
      groomed: false
      morning sickness: true
      explanation: -7 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
    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 St Clair. Either swell direction (74°), size (1.3m), or wind (9 km/h from 350°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.3
    height ft: 4.3
    direction degrees: 74
    direction cardinal: ENE
    period s: 9
    explanation: 1.3m (4.3ft) swell from 74° (ENE) at 9s period
  wind:
    speed kmh: 9
    speed mph: 5.6
    direction degrees: 350
    direction cardinal: N
    explanation: 9 km/h (6 mph) from 350° (N)
  secondary swell:
    height m: 0.4
    direction degrees: 210
    direction cardinal: SSW
    period s: 13

date: 2026-08-14
day index: 9
strike score:
  final score: 57
  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: 19
      out of: 25
      explanation: Marginal size: 1.7m is 0.1m from ideal 1.6m.
    swell period:
      score: 15
      out of: 25
      explanation: Moderate period: 20s 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 259° (W). Destroying wave quality. Offshore range: 320°-40°.
  adjustments:
    wind history:
      adjustment: -4
      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 St Clair. The 1.7m 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: 1.7
    height ft: 5.6
    direction degrees: 181
    direction cardinal: S
    period s: 20
    explanation: 1.7m (5.6ft) swell from 181° (S) at 20s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 259
    direction cardinal: W
    explanation: 13 km/h (8 mph) from 259° (W)
  secondary swell:
    height m: 0.4
    direction degrees: 218
    direction cardinal: SW
    period s: 12

Strike Mission
type: Organization