
Surf Forecasts:
Mangamaunu surf forecast from 4 Aug 2026:
- Best quality surf: Wednesday 5 Aug, 6AM (local time) - 13ft (4.0m), 12s period, S swell with offshore winds.
- Most powerful swell: Wednesday 5 Aug, 6AM (local time) - 13ft (4.0m), 12s period, S swell with 4,412 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 6AM (local time) - 13ft (4.0m), 12s period with S swell.
Best Forecast Surf Conditions for Mangamaunu this week:
The surf forecast for Mangamaunu over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 05) at 6AM. The primary swell is predicted to be 4.0m and 12s period with a secondary swell of 3.5m and 12s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Mangamaunu in the next 16 days are 4.0m 12s and forecast to arrive on Wednesday (Aug 05) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 7s period and expected on Sunday (Aug 09) at 9AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 5th Aug) | 13ft (4.0m) 12s |
| Best Surf | 6AM (Wed 5th Aug) | 13ft (4.0m) 12s |
| Most Powerful | 6AM (Wed 5th Aug) | 13ft (4.0m) 12s |
Table - best surf conditions forecast for Mangamaunu over the next 16 days.
The Lowdown
Right, grab a coffee and listen up. I’ve been staring at the charts for our little slice of paradise, and it’s a bit of a mixed bag, but there’s some serious firepower on the horizon.
The real story here is the push of energy that’s coming in. We’re looking at a proper run of swell, not just knee-high dribble. The standout, without a doubt, is Mangamaunu. This is a world-class point break, and it’s not for the faint of heart—it’s an advanced wave, and it’s very consistent. It’s exposed to the south, and the optimum swell direction is from the southeast, so keep that in mind.
The first real crack at it kicks off on Wednesday, August 5th. We’re talking a solid 12 ft of south swell, with a 12-second period. The energy is pumping hard, a massive 6168 (combined energy). That’s a lot of water moving. The wind is a gentle offshore from the WSW, so you’re looking at clean, groomed walls. This is expert territory only—anything over 8 ft and you’d better know what you’re doing. The water temp is about average for this time of year, so a steamer is probably a good idea for the dawn patrol.
The next morning, Thursday, August 6th, is a gem. The swell drops to a more manageable 6 ft from the SSE, but the wind is glassy—a light NW breeze at 5 km/h. The energy is still moderate (945), and the wave comment says “expect very good surf conditions.” The period is a solid 10 seconds, so it’ll have some shape. This is a much more user-friendly size, but still solid.
Friday, August 7th is another one to circle. The morning delivers a 5 ft south swell, but the period is a very long 14 seconds, and the energy is up at 1207. That’s a groundswell. At a point break like Mangamaunu, that long period is a dream—it’ll draw in beautifully with long, rifling walls. The wind is a light cross-off from the WNW, keeping it clean. The afternoon goes glassy with a NW wind, and the swell drops slightly to 5 ft with a 13-second period. That’s a solid day.
The weekend sees a drop in size. Saturday and Sunday (August 8th and 9th) are small, with 3 ft to 4 ft of swell, but the wind is glassy again. It’ll be a fun little board day, nothing to get too excited about.
Then we get a bit of a lull. Monday, August 10th, picks up to 6 ft, but the wind is a moderate cross-off from the WSW at 20 km/h, and the period is a short 8 seconds. The wave comment says “marginal.” That’s more of a choppy, short-period mess. Tuesday the 11th looks poor with onshore winds and small, short-period swell.
Things start to look a bit more interesting again on Thursday, August 13th, with a glassy 5 ft wave from the east, but it’s still a short period (7 seconds). It’s surfable.
The real return to form looks like it’s shaping up for Friday, August 14th. The morning brings a 8 ft east swell with an 8-second period, and the energy is back up to 1220. The wind is a clean cross-off from the SW. The wave comment says “excellent surf conditions for experienced surfers.” That’s a solid, powerful wave.
The following week, starting Monday, August 17th, we see another pulse. The morning of the 17th is a clean 5 ft southerly swell with a 7-second period and energy of 582. The wind is a gentle cross-off from the SW. Not the best period, but clean.
The absolute standout for the second week is Tuesday, August 18th. The afternoon is a glassy, 7 ft south swell with a 10-second period and energy of 1116. The wave comment says “excellent surf conditions for experienced surfers.” That is a dream session—no wind, proper size, and a good period. Mark it.
Then, on Thursday, August 20th, the morning is glassy with a 6 ft SSE swell and a very long 12-second period, with energy of 1441. That’s another absolute classic. The long period will make it a bit more challenging at a beach break, but at a point like Mangamaunu, it’s pure gold.
So, to sum it up: Thursday the 6th morning is your best early call for a clean, fun size. Friday the 7th is a classic groundswell day. The true standouts, the ones that will have you calling in sick, are the afternoons of Tuesday the 18th and the morning of Thursday the 20th. They’re a bit further out, so the forecast could shift, but right now, they look like complete magic.
Stay safe out there, and don’t be a hero if it’s too big.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue night. Very mild (max 11°C on Fri afternoon, min 2°C on Wed night). Winds decreasing (fresh winds from the SW on Tue night, calm by Fri morning). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sun night. Very mild (max 13°C on Sun morning, min 9°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | ||||||||||||||
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 11 | S 12 | S 11 | SSE 11 | SSE 10 | SE 10 | SE 10 | S 14 | S 13 | S 12 | S 11 | S 10 | SSE 10 | SSE 10 | SSE 12 | SSW 7 | S 8 | S 9 | SSE 9 |
Wave Graph | |||||||||||||||||||
3887 | 3549 | 1855 | 936 | 731 | 469 | 328 | 881 | 649 | 393 | 338 | 308 | 255 | 169 | 258 | 215 | 439 | 607 | 442 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | off | glassy | on | cross-off | cross-off | glassy | cross-off | glassy | glassy | cross | glassy | cross-off | glassy | cross-off | cross-off | glassy |
High Tide | 9:07PM1.42m | 9:34AM1.41m | 9:57PM1.41m | 10:26AM1.45m | 10:50PM1.42m | 11:21AM1.51m | 11:46PM1.44m | 12:18PM1.57m | 00:42AM1.46m | 1:15PM1.63m | 1:39AM1.50m | 2:12PM1.69m | 2:36AM1.53m | ||||||
Low Tide | 3:24AM0.23m | 3:48PM0.24m | 4:12AM0.21m | 4:42PM0.23m | 5:03AM0.19m | 5:38PM0.20m | 5:56AM0.15m | 6:35PM0.17m | 6:52AM0.11m | 7:33PM0.14m | 7:48AM0.07m | 8:31PM0.10m | |||||||
— | 7:31 | — | — | 7:28 | — | — | 7:28 | — | — | 7:26 | — | — | 7:26 | — | — | 7:24 | — | — | |
— | — | 5:30 | — | — | 5:31 | — | — | 5:32 | — | — | 5:34 | — | — | 5:35 | — | — | 5:36 | — | |
mm | 2 | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 2 | — | — | — |
Temp °C | 4 | 7 | 7 | 3 | 7 | 7 | 4 | 9 | 11 | 11 | 11 | 11 | 10 | 13 | 12 | 10 | 12 | 11 | 9 |
Feels °C | -4 | 2 | 2 | -1 | 4 | 4 | 1 | 7 | 9 | 8 | 10 | 9 | 8 | 12 | 9 | 9 | 6 | 5 | 6 |
Swell 1 Height (m) Direction Period (s) | — | S 12 | S 11 | SSE 11 | SSE 10 | SE 10 | SE 10 | S 14 | S 13 | S 12 | S 11 | S 10 | SSE 10 | NE 6 | SSE 12 | SSW 7 | ENE 12 | S 15 | SSE 9 |
— | 2604 | 1855 | 936 | 731 | 469 | 328 | 881 | 649 | 393 | 338 | 308 | 255 | 138 | 258 | 89 | 14 | 17 | 442 | |
Swell 2 Height (m) Direction Period (s) | — | SE 19 | SE 18 | S 11 | SE 15 | S 10 | S 9 | SE 10 | SE 12 | SE 11 | SE 12 | SE 11 | NNE 5 | SSE 10 | E 7 | SSE 11 | S 16 | SE 14 | SE 12 |
— | 15 | 12 | 247 | 107 | 228 | 142 | 188 | 286 | 147 | 72 | 45 | 11 | 169 | 72 | 133 | 20 | 8 | 53 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | SE 16 | SE 15 | S 13 | SE 13 | SE 13 | NNE 6 | S 16 | SSE 14 | SSE 14 | S 17 | SSE 13 | NNE 7 | ENE 7 | SE 16 | NE 8 | S 14 |
— | — | — | 67 | 107 | 3 | 199 | 134 | 3 | 126 | 69 | 37 | 24 | 67 | 25 | 20 | 10 | 3 | 16 | |
Wind waves Height (m) Direction Period (s) | S 11 | S 12 | — | — | — | — | — | NE 4 | — | — | — | — | NNE 6 | NNE 7 | SW 4 | SSW 7 | S 8 | S 9 | — |
3887 | 3549 | — | — | — | — | — | 4 | — | — | — | — | 77 | 483 | 14 | 215 | 439 | 607 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 154 | 0 | 72 | 0 | 0 | 13 | 0 | 0 | 0 | 0 | 0 | 0 | 19 | 0 | 0 | 0 | 23 | 157 | 0 |
Best forecast wave conditions in Kaikoura and Marlborough | |||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Mangamaunu Surf forecast
The above surf forecast table for Mangamaunu provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Mangamaunu can be found by selecting the local surf guide option on the grey menu. Our Mangamaunu 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 (Mangamaunu) 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 Mangamaunu 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.
Mangamaunu is 89 km (55 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.











