Surf Forecasts:
Shag Beach surf forecast from 5 Sep 2026:
- Best quality surf: Saturday 12 Sep, 9PM (local time) - 10ft (3.0m), 12s period, SSW swell with offshore winds.
- Most powerful swell: Saturday 12 Sep, 3PM (local time) - 11ft (3.5m), 15s period, SSW swell with 4,786 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 9AM (local time) - 3ft (0.9m), 16s period with S swell.
Best Forecast Surf Conditions for Shag Beach this week:
The surf forecast for Shag Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 06) at 9AM. The primary swell is predicted to be 0.9m and 16s period with a secondary swell of 0.9m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Shag Beach in the next 16 days are 3.5m 15s and forecast to arrive on Saturday (Sep 12) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Thursday (Sep 10) at 3PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sun 6th Sep) | 3ft (0.9m) 16s |
| Best Surf | 9PM (Sat 12th Sep) | 10ft (3.0m) 12s |
| Most Powerful | 3PM (Sat 12th Sep) | 11ft (3.5m) 15s |
Table - best surf conditions forecast for Shag Beach over the next 16 days.
Short Range ForecastLight rain (total 9mm), mostly falling on Sun afternoon. Very mild (max 12°C on Sat night, min 6°C on Sun afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Fri afternoon. Very mild (max 13°C on Wed afternoon, min 5°C on Thu night). Winds increasing (light winds from the W on Wed night, strong winds from the WSW by Fri afternoon). | ||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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) | SSW 16 | S 16 | S 16 | S 15 | S 9 | S 10 | S 9 | S 8 | S 8 | S 8 | S 19 | S 18 | SSW 13 | S 14 | S 19 | S 19 | S 18 | SSW 17 | SSW 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 950 | 438 | 248 | 168 | 122 | 148 | 73 | 45 | 44 | 31 | 29 | 55 | 277 | 142 | 258 | 1037 | 758 | 1244 | 3001 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-on | glassy | glassy | cross-on | cross | cross-off | on | cross-off | cross-off | cross-on | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off |
High Tide | 10:01PM1.57m | 10:40AM1.73m | 11:05PM1.64m | 11:41AM1.80m | 00:03AM1.72m | 12:36PM1.87m | 00:56AM1.79m | 1:27PM1.92m | 1:46AM1.84m | 2:14PM1.94m | 2:33AM1.87m | 3:00PM1.92m | |||||||
Low Tide | 4:16AM0.26m | 4:56PM0.29m | 5:16AM0.18m | 5:53PM0.22m | 6:12AM0.10m | 6:47PM0.15m | 7:05AM0.03m | 7:37PM0.10m | 7:56AM-0.00m | 8:25PM0.06m | 8:44AM-0.00m | 9:12PM0.06m | |||||||
 |  |  |  |  | |  |  | |  |  | | | |  | | | | | |
 | — | 6:56 | — | — | 6:54 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — |
 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:16 | — | — | 6:17 | — | — | 6:19 | — |
mm | — | 1 | 7 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 2 | — |
Temp °C | 12 | 8 | 7 | 7 | 7 | 8 | 8 | 9 | 9 | 8 | 12 | 13 | 11 | 9 | 8 | 6 | 11 | 8 | 7 |
Feels °C | 8 | 6 | 3 | 5 | 5 | 2 | 2 | 6 | 5 | 5 | 8 | 9 | 6 | 4 | 1 | -1 | 8 | -1 | -2 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 9 | S 8 | S 9 | S 9 | S 10 | S 9 | NE 5 | S 8 | S 8 | S 8 | SSW 8 | NE 5 | ENE 8 | SSW 15 | S 19 | S 18 | SSW 17 | ENE 8 |
| kJ | 950 | 132 | 116 | 139 | 122 | 148 | 73 | 27 | 44 | 31 | 18 | 19 | 11 | 86 | 222 | 1037 | 758 | 1244 | 6 |
Swell 2 Height (m) Direction Period (s) | NE 4 | S 16 | S 16 | S 15 | SSW 14 | SSW 14 | S 13 | S 8 | ENE 5 | NE 5 | NE 5 | S 18 | ENE 9 | S 14 | ENE 8 | ENE 8 | SSW 9 | NE 9 | E 14 |
| kJ | 3 | 438 | 248 | 168 | 68 | 38 | 14 | 45 | 17 | 8 | 3 | 55 | 16 | 142 | 73 | 13 | 99 | 27 | 4 |
Swell 3 Height (m) Direction Period (s) | SE 9 | NE 6 | — | NE 5 | NE 5 | NE 7 | E 10 | S 13 | NE 10 | NE 9 | S 19 | S 12 | S 16 | SSW 8 | S 19 | ENE 7 | NNE 3 | E 8 | ENE 14 |
| kJ | 3 | 6 | — | 7 | 7 | 2 | 2 | 13 | 4 | 12 | 29 | 11 | 48 | 21 | 258 | 5 | 2 | 1 | 21 |
Wind waves Height (m) Direction Period (s) | — | — | NE 8 | — | — | NE 6 | NNE 4 | — | — | — | — | NE 3 | SSW 13 | — | SSW 5 | SSW 7 | NW 3 | — | SSW 16 |
| kJ | — | — | 11 | — | — | 8 | 32 | — | — | — | — | 7 | 277 | — | 87 | 169 | 1 | — | 3001 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 15 | 0 | 57 | 0 | 0 | 60 | 53 | 0 | 53 | 25 | 25 | 60 | 45 | 4 | 39 | 0 | 73 | 253 | 112 |
Best forecast wave conditions in Otago | |||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Shag Beach surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Shag Beach Surf forecast
The above surf forecast table for Shag Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Shag Beach can be found by selecting the local surf guide option on the grey menu. Our Shag Beach 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 (Shag Beach) 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 Shag Beach 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.
Are you planning a holiday in Otago? If you are looking for accommodation near Shag Beach, camping, hotels and holiday cottages in Otago, consider staying in Dunedin which is 58 km (36 miles) away.
Nearest