Surf Forecasts:
Dunedin - St Clair surf forecast from 26 Aug 2026:
- Best quality surf: Monday 31 Aug, 3AM (local time) - 13ft (4.0m), 14s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 31 Aug, 12AM (local time) - 13ft (4.0m), 14s period, SSW swell with 6,837 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 6AM (local time) - 4ft (1.2m), 11s period with S swell.
Best Forecast Surf Conditions for Dunedin - St Clair this week:
The surf forecast for Dunedin - St Clair over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 28) at 6AM. The primary swell is predicted to be 1.2m and 11s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Dunedin - St Clair in the next 16 days are 4.0m 14s and forecast to arrive on Monday (Aug 31) at 12AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Thursday (Aug 27) at 6PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Fri 28th Aug) | 4ft (1.2m) 11s |
| Best Surf | 3AM (Mon 31st Aug) | 13ft (4.0m) 14s |
| Most Powerful | 12AM (Mon 31st Aug) | 13ft (4.0m) 14s |
Table - best surf conditions forecast for Dunedin - St Clair over the next 16 days.
The Lowdown
G’day, I’m Rusty, and here’s your local Dunedin surf outlook.
The next 16 days have a real mix of conditions, and the standout sessions are definitely going to be for the experienced crew. The water temp at St Clair is sitting at 52°, which is a good 4° warmer than average for this time of year – that’s already notable, so you can leave the thickest steamer at home.
We kick off Wednesday afternoon the 26th with light rain and a cross-on breeze. Swell is 6 ft from the south with a long 16-second period, and it’s packing moderate-to-strong energy (1584). But it’s a marginal call, so not the best start.
Thursday the 27th picks up a bit more size – 6 ft south swell, 14-second period, moderate energy (1384) – but the morning has a fresh 22 mph NE breeze, which is clean but strong. The afternoon gets even windier at 31 mph, and the waves drop to 6 ft with energy down to 871. Not great.
Friday the 28th morning is the first real bright spot. A light 6 mph westerly keeps things clean, and the swell is 4 ft south with a 11-second period and moderate energy (348). It’s solid enough for a fun session, but still not a standout.
Saturday the 29th and Sunday the 30th are small and ordinary. Saturday sees 2 ft south swell with weak energy (95), and Sunday morning picks up a bit – 4 ft SSW swell, 14-second period, moderate energy (510) – but the afternoon turns ugly with a strong 28 mph WSW cross-breeze and a 10 ft SSW swell that’s just too big and messy for this spot.
Now, here’s where it gets interesting. Monday the 31st through Tuesday the 1st of September, the swell is big: 8 ft to 8 ft south to southwest, with 12-to-14-second periods and strong energy (2018 to 3212). The winds are offshore or cross-off, but the waves are predicted to be too big for this break, so this is experts-only territory.
The real standout comes on Tuesday afternoon the 1st of September. The swell drops to 6 ft from the south, 11-second period, moderate energy (782), and the wind swings to a light offshore from the northwest at 12 mph. That’s clean, lined-up surf for experienced surfers.
Then we hit a lull Wednesday the 2nd – strong winds, messy, and the swell is either tiny or huge with poor conditions.
The next major highlight is Thursday the 3rd of September. Morning: 8 ft SSW swell with a very long 18-second period, strong energy (3565), and a light offshore from the NNW at 6 mph. That’s a big, powerful groundswell – best for a point or reef, and it’s excellent for experienced surfers. The afternoon is even better: 6 ft SSW swell, 17-second period, strong energy (2117), and a gentle offshore breeze from the north. That’s the pick of the entire period.
Friday the 4th of September continues the run. Morning: 6 ft SW swell, 13-second period, moderate energy (1157), light offshore. Afternoon: glassy conditions with a 6 ft SSW swell, 13-second period, and moderate energy (1025). Clean, good shape, and excellent for experienced surfers.
Saturday the 5th morning is small but clean, with a 2 ft south swell and a very long 18-second period, but the energy is weak (574). The afternoon gets messy with a fresh cross-shore.
Sunday the 6th: morning has a 5 ft SSW swell, 16-second period, moderate energy (1012), and a moderate cross-off breeze. The afternoon is cleaner with a light westerly and 4 ft SSW swell, 15-second period, and moderate energy (581). Not a standout but a decent session.
Monday the 7th and Tuesday the 8th are mostly poor or small, with a brief window Tuesday morning: 5 ft SSW swell, 12-second period, moderate energy (531), and a gentle offshore from the north. That’s worth a look.
Wednesday the 9th of September kicks up a massive 13 ft SW swell with an 18-second period and very strong energy (13375) – that’s way too big for this spot, and only for the most experienced. The afternoon is smaller and messy.
The final days, Thursday the 10th, have 3 to 4 ft SSE swell, 12-second period, moderate energy (616 to 843), and clean cross-off winds. It’s marginal but surfable.
So, the best on offer is Thursday the 3rd of September afternoon and Friday the 4th of September – both offer excellent, clean conditions for experienced surfers. If you’re a beginner, look for the smaller windows on Friday the 28th morning or Tuesday the 8th morning.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Thu morning. Very mild (max 12°C on Fri afternoon, min 6°C on Thu morning). Winds decreasing (strong winds from the NE on Thu afternoon, calm by Sat afternoon). | Days 5-7 Weather SummaryModerate rain (total 18mm), heaviest on Mon afternoon. Very mild (max 17°C on Tue afternoon, min 5°C on Sun night). Winds increasing (light winds from the NW on Sat night, strong winds from the WSW by Sun afternoon). | ||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||
Wave Height (m) Direction Period (s) | S 16 | S 14 | S 12 | S 12 | S 11 | S 10 | S 10 | SW 9 | SSW 10 | SSW 11 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 12 | SSW 12 | SW 13 | S 11 | S 11 |
Wave Graph | |||||||||||||||||||
2376 | 1371 | 871 | 441 | 338 | 314 | 206 | 357 | 80 | 236 | 999 | 2669 | 6837 | 5804 | 2946 | 3891 | 1890 | 1068 | 676 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-off | cross-off | cross-off | cross-on | cross | cross | glassy | cross-off | cross-off | cross | cross | cross | cross | cross-off | cross-off | cross-off | off |
High Tide | 2:53AM1.62m | 3:17PM1.70m | 3:33AM1.64m | 3:57PM1.71m | 4:14AM1.65m | 4:38PM1.70m | 4:56AM1.66m | 5:20PM1.68m | 5:40AM1.66m | 6:04PM1.65m | 6:27AM1.65m | 6:54PM1.61m | |||||||
Low Tide | 9:10AM0.23m | 9:36PM0.25m | 9:50AM0.20m | 10:14PM0.23m | 10:30AM0.18m | 10:53PM0.21m | 11:10AM0.17m | 11:32PM0.21m | 11:53AM0.18m | 00:14AM0.21m | 12:37PM0.20m | 00:58AM0.22m | |||||||
— | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:11 | — | — | 7:09 | — | — | 7:07 | — | — | |
— | — | 6:01 | — | — | 6:02 | — | — | 6:04 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | |
mm | — | 2 | 2 | — | — | — | 1 | — | — | — | 3 | 1 | 4 | 3 | 6 | 1 | — | — | 5 |
Temp °C | 8 | 7 | 8 | 9 | 11 | 12 | 10 | 11 | 12 | 10 | 10 | 8 | 6 | 8 | 9 | 11 | 16 | 17 | 14 |
Feels °C | 4 | -2 | -2 | 3 | 9 | 9 | 4 | 8 | 10 | 7 | 3 | -3 | -4 | -1 | 2 | 4 | 10 | 13 | 8 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 14 | S 12 | S 12 | ENE 9 | ENE 10 | ENE 10 | ENE 8 | ENE 9 | SSW 11 | SSW 16 | ENE 8 | SSW 10 | SSW 15 | — | S 12 | S 12 | S 11 | S 11 |
2376 | 1371 | 871 | 441 | 539 | 625 | 299 | 78 | 73 | 222 | 999 | 6 | 1020 | 2959 | — | 1715 | 1258 | 1068 | 676 | |
Swell 2 Height (m) Direction Period (s) | ESE 13 | ESE 12 | — | — | S 11 | S 10 | S 10 | SSW 9 | SSW 10 | SSW 13 | ENE 8 | SE 12 | SSW 15 | E 11 | — | SSW 15 | SSE 16 | S 20 | SSW 17 |
16 | 13 | — | — | 338 | 314 | 206 | 68 | 80 | 236 | 25 | 6 | 1275 | 2 | — | 242 | 51 | 30 | 101 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | S 22 | S 22 | SE 14 | S 10 | SSE 9 | ENE 8 | SE 12 | — | NE 8 | — | — | S 23 | E 10 | NE 10 | NE 10 |
— | — | — | — | 10 | 9 | 8 | 48 | 29 | 36 | 6 | — | 3 | — | — | 11 | 2 | 4 | 4 | |
Wind waves Height (m) Direction Period (s) | — | ENE 4 | NE 6 | ENE 8 | — | — | SW 5 | SW 9 | — | — | WSW 4 | SSW 15 | SSW 14 | SSW 14 | SSW 12 | SSW 12 | SW 13 | — | NNE 4 |
— | 52 | 353 | 508 | — | — | 8 | 357 | — | — | 27 | 2669 | 6837 | 5804 | 2946 | 3891 | 1890 | — | 5 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 5 | 291 | 518 | 66 | 0 | 15 | 13 | 13 | 0 | 0 | 86 | 320 | 181 | 174 | 174 | 77 | 15 | 15 | 0 |
Best forecast wave conditions in Otago | |||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Dunedin - St Clair Surf forecast
The above surf forecast table for Dunedin - St Clair provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Dunedin - St Clair can be found by selecting the local surf guide option on the grey menu. Our Dunedin - St Clair surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Dunedin - St Clair) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Dunedin - St Clair may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Dunedin - St Clair is 5 km (3 miles) from Dunedin. If you plan a holiday in Otago, look for hotels and other accommodation in Dunedin. Dunedin has rooms for a wide range of budgets as well as car hire and transport links.











