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Shag Beach Surf Forecast
/ Otago (35 surf breaks) /
Shag Beach surfForecast / Otago / New Zealand
12 Day Weather and Surf, issued 5 pm Monday 21 Jul 2025 NZST
Best Forecast Surf Conditions for Shag Beach this week:
The surf forecast for Shag Beach over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Jul 21) at 9PM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.5m and 15s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Shag Beach in the next 12 days are 1.2m 12s and forecast to arrive on Wednesday (Jul 23) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 8s period and expected on Tuesday (Jul 29) at 12AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 21st Jul) | 3.5ft (1.0m) 10s |
| Best Surf | 3PM (Tue 22nd Jul) | 2.5ft (0.7m) 16s |
| Most Powerful | 3AM (Wed 23rd Jul) | 4ft (1.2m) 12s |
Table - best surf conditions forecast for Shag Beach over the next 12 days.
Short Range Forecast Mostly dry. Very mild (max 10°C on Mon afternoon, min 6°C on Wed night). Wind will be generally light. | Days 3-6 Weather Summary Mostly dry. Very mild (max 11°C on Thu afternoon, min 7°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||
Mon 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | Sunday 27 | |||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |||
Rating (10 max) | |||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 10 | 16 | 12 | 12 | 11 | 11 | 12 | 11 | 11 | 11 | 11 | 10 | 15 | 13 | 12 | 10 | 10 | 9 | 13 | ||
Wave (?)Graph  | |||||||||||||||||||||||
| Energy (?) | 367 | 325 | 287 | 506 | 531 | 551 | 467 | 402 | 292 | 244 | 156 | 98 | 70 | 42 | 37 | 74 | 106 | 79 | 68 | 83 | 91 | ||
Wind (km/h) | |||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | off | off | glass | off | cross- off | glass | cross- off | cross- off | cross- on | off | off | cross- on | cross- off | cross- off | cross- off | off | cross- off | cross- on | cross | cross- on | ||
High Tide / height (m) | 12:20AM 1.70 | 12:55PM 1.86 | 1:16AM 1.75 | 1:49PM 1.91 | 2:09AM 1.79 | 2:40PM 1.94 | 2:59AM 1.80 | 3:29PM 1.93 | 3:47AM 1.80 | 4:16PM 1.90 | 4:34AM 1.76 | 5:03PM 1.83 | 5:21AM 1.70 | ||||||||||
Low Tide / height (m) | 6:09PM 0.24 | 6:29AM 0.14 | 7:07PM 0.21 | 7:25AM 0.10 | 8:02PM 0.18 | 8:18AM 0.07 | 8:54PM 0.16 | 9:10AM 0.06 | 9:44PM 0.16 | 10:00AM 0.07 | 10:33PM 0.17 | 10:49AM 0.11 | 11:20PM 0.20 | 11:37AM 0.17 | |||||||||
Mon 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | Sunday 27 | |||||||||||||||||
| Sunrise | - | - | 8:06 | - | - | 8:04 | - | - | 8:03 | - | - | 8:03 | - | - | 8:02 | - | - | 8:00 | - | - | 7:58 | ||
| Sunset | 5:19 | - | - | 5:20 | - | - | 5:21 | - | - | 5:22 | - | - | 5:22 | - | - | 5:23 | - | - | 5:24 | - | - | ||
 |  | | | | | | | | | | |  |  |  | | | | | | | |||
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
| Temp. °C | 10 | 8 | 9 | 10 | 8 | 9 | 9 | 7 | 9 | 11 | 9 | 9 | 10 | 9 | 10 | 10 | 10 | 10 | 10 | 9 | 8 | ||
| Feels °C (?) | 8 | 6 | 8 | 8 | 6 | 7 | 6 | 3 | 4 | 7 | 5 | 6 | 6 | 5 | 7 | 6 | 8 | 7 | 7 | 6 | 2 | ||
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Otago
light winds from the WSW at Port Chalmers wx mean that is clean at Shag Beach. No surfable waves
49 km away, 2 h 18 min ago
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 12 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.
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