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Blue Duck Stream Surf Forecast
/ Kaikoura and Marlborough (12 surf breaks) /
Surf Forecasts:
Blue Duck Stream surfForecast / Kaikoura and Marlborough / New Zealand
12 Day Weather and Surf, issued 11 am Thursday 21 Aug 2025 NZST
Best Forecast Surf Conditions for Blue Duck Stream this week:
The surf forecast for Blue Duck Stream over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 21) at 9PM. The primary swell is predicted to be 1.6m and 14s period with a secondary swell of 0.1m and 9s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Blue Duck Stream in the next 12 days are 2.0m 14s and forecast to arrive on Thursday (Aug 21) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 6s period and expected on Thursday (Aug 28) at 12PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 21st Aug) | 5ft (1.6m) 14s |
| Best Surf | 9PM (Thu 21st Aug) | 5ft (1.6m) 14s |
| Most Powerful | 6PM (Thu 21st Aug) | 6.5ft (2.0m) 14s |
Table - best surf conditions forecast for Blue Duck Stream over the next 12 days.
Short Range Forecast Mostly dry. Very mild (max 12°C on Sat morning, min 6°C on Thu night). Wind will be generally light. | Days 3-6 Weather Summary Mostly dry. Very mild (max 15°C on Tue afternoon, min 9°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 21 | Friday 22 | Saturday 23 | Sunday 24 | Monday 25 | Tuesday 26 | Wednesday 27 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 16 | 15 | 14 | 12 | 11 | 10 | 9 | 9 | 8 | 11 | 11 | 10 | 8 | 15 | 15 | 14 | 13 | 10 | 10 | 6 | 8 |
Wave (?)Graph  | |||||||||||||||||||||
| Energy (?) | 726 | 3306 | 897 | 544 | 400 | 358 | 269 | 211 | 115 | 113 | 100 | 68 | 47 | 40 | 41 | 46 | 55 | 35 | 29 | 70 | 39 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross | cross- off | cross- off | cross- on | cross- off | cross | cross- on | cross- off | glass | on | glass | glass | on | glass | glass | glass | off | cross- off | glass | off |
High Tide / height (m) | 3:00PM 1.64 | 3:22AM 1.48 | 3:52PM 1.63 | 4:13AM 1.47 | 4:41PM 1.60 | 5:03AM 1.46 | 5:30PM 1.57 | 5:52AM 1.44 | 6:17PM 1.53 | 6:40AM 1.43 | 7:05PM 1.48 | 7:29AM 1.41 | 7:52PM 1.43 | ||||||||
Low Tide / height (m) | 9:20PM 0.15 | 9:33AM 0.10 | 10:12PM 0.15 | 10:24AM 0.11 | 11:02PM 0.15 | 11:15AM 0.12 | 11:50PM 0.16 | 12:05PM 0.15 | 12:37AM 0.18 | 12:54PM 0.18 | 1:23AM 0.21 | 1:43PM 0.22 | 2:09AM 0.24 | ||||||||
Thursday 21 | Friday 22 | Saturday 23 | Sunday 24 | Monday 25 | Tuesday 26 | Wednesday 27 | |||||||||||||||
| Sunrise | 7:09 | - | - | 7:07 | - | - | 7:05 | - | - | 7:03 | - | - | 7:01 | - | - | 7:01 | - | - | 6:58 | - | - |
| Sunset | - | 5:46 | - | - | 5:47 | - | - | 5:49 | - | - | 5:50 | - | - | 5:51 | - | - | 5:52 | - | - | 5:53 | - |
 | |  |  | |  | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 8 | 9 | 7 | 9 | 10 | 8 | 12 | 11 | 10 | 11 | 11 | 10 | 12 | 12 | 10 | 14 | 15 | 12 | 17 | 18 | 14 |
| Feels °C (?) | 3 | 4 | 4 | 6 | 7 | 4 | 8 | 7 | 7 | 8 | 9 | 8 | 10 | 10 | 8 | 11 | 13 | 9 | 14 | 16 | 11 |
- 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 Kaikoura and Marlborough
Still cross-shore at Blue Duck Stream (moderate winds from the SSW at KaikouraAws 17 km from Blue Duck Stream). 1.4m 7s swell from the S with a 0.8m 15s groundswell from the SSW. 2 swells combining to make bigger set waves.
17 km away, 1 h 27 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 Blue Duck Stream 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 Blue Duck Stream Surf forecast
The above surf forecast table for Blue Duck Stream provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Blue Duck Stream can be found by selecting the local surf guide option on the grey menu. Our Blue Duck Stream 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 (Blue Duck Stream) 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 Blue Duck Stream 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.
Blue Duck Stream is 86 km (53 miles) from the city of Blenheim. If you plan a holiday in Kaikoura and Marlborough, look for hotels and other accommodation in Blenheim. Blenheim has rooms for a wide range of budgets as well as car hire and transport links.
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