Surf Forecasts:
Mangamaunu surf forecast from 13 Sep 2026:
- Best quality surf: Saturday 19 Sep, 6PM (local time) - 6ft (1.9m), 8s period, S swell with glassy winds.
- Most powerful swell: Monday 14 Sep, 3AM (local time) - 5.5ft (1.7m), 12s period, S swell with 789 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 6AM (local time) - 5.5ft (1.7m), 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 Monday (Sep 14) at 6AM. The primary swell is predicted to be 1.7m and 12s period with a secondary swell of 0.1m and 11s. Another secondary swell of 0.3m and 3s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Mangamaunu in the next 16 days are 1.7m 12s and forecast to arrive on Monday (Sep 14) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 6s period and expected on Saturday (Sep 19) at 9AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 14th Sep) | 5.5ft (1.7m) 12s |
| Best Surf | 6PM (Sat 19th Sep) | 6ft (1.9m) 8s |
| Most Powerful | 3AM (Mon 14th Sep) | 5.5ft (1.7m) 12s |
Table - best surf conditions forecast for Mangamaunu over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's cookin' at Mangamaunu.
We've got a solid run of surf on the way, but the first couple of days are a bit of a tease. The real standout action doesn't kick in until the second week, so keep that in mind.
Monday the 14th kicks off with a clean, glassy morning. Swell is 5ft from the south with a 12-second period. That’s a nice little groundswell, but the combined energy is moderate (677). It's a good start, but the afternoon wind shifts onshore and things get a bit ordinary.
Tuesday the 15th is all small and glassy. The morning sees 3ft south swell at 9 seconds (221 energy), so it's fun for a grovel but nothing to get excited about. The drop-off continues Wednesday, with tiny 1ft waves and barely any energy (48). A bit of a flat spell creeps in Thursday and Friday morning, but Friday afternoon shows a pulse of 3ft south-east swell with a longer 13-second period, combined energy of 525. That’s the first hint of something better.
Saturday the 20th is the real highlight. The morning brings a solid 12ft south swell (11 seconds) with an incredible 2812 combined energy. That's a powerful, strong swell. The wind is light cross-off from the SSW, so it should be clean. This is for experienced surfers only – that size is no joke. The afternoon has a big drop-off and onshore wind, so get in early.
Sunday the 21st has a nice 4ft morning with light offshore wind, clean conditions. Monday the 22nd morning is glassy with 6ft south swell (623 energy), a great session. Tuesday the 23rd morning has 4ft, glassy, with 608 energy. Wednesday the 24th sees some onshore wind and rain, but the afternoon has a 4ft south swell with a very long 19-second period (1098 energy). That's a deep groundswell – expect long, powerful lines at this point break. It'll be clean with cross-off wind.
The best on offer is clearly Saturday morning, September 20th. A massive 12ft south swell with excellent energy and clean conditions. If you're experienced, that's your window. The second standout is the following Wednesday afternoon, September 24th, with that super long-period groundswell – clean and powerful, but also demanding.
The water temp is about 51°F, which is pretty much bang on average for this time of year, so don't expect any surprises there.
Overall, there's a good stretch of surf from the 20th onwards, with the first week being more of a waiting game. Keep your eyes on the forecast.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Tue afternoon, min 9°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Thu afternoon. Very mild (max 17°C on Sat morning, min 6°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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 | S 10 | S 9 | S 9 | S 8 | SE 10 | NE 8 | SSW 15 | ESE 11 | SSW 14 | S 7 | ESE 13 | SE 12 | ESE 11 | SE 12 | S 8 | S 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 826 | 675 | 451 | 284 | 169 | 99 | 35 | 35 | 28 | 43 | 46 | 41 | 352 | 151 | 209 | 215 | 202 | 398 | 196 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | cross-on | glassy | glassy | glassy | off | glassy | on | glassy | cross | cross-off | cross-off | cross-off | cross | cross-off | glassy | glassy | cross-off |
High Tide | 6:46AM1.53m | 7:11PM1.50m | 7:37AM1.52m | 8:02PM1.45m | 8:28AM1.49m | 8:53PM1.40m | 9:19AM1.47m | 9:43PM1.36m | 10:09AM1.45m | 10:33PM1.33m | 10:58AM1.43m | 11:22PM1.31m | |||||||
Low Tide | 00:38AM0.11m | 1:04PM0.13m | 1:27AM0.15m | 1:56PM0.18m | 2:16AM0.20m | 2:48PM0.23m | 3:05AM0.24m | 3:39PM0.27m | 3:53AM0.29m | 4:28PM0.31m | 4:40AM0.32m | 5:16PM0.33m | |||||||
 |  | | | | | |  | |  |  |  |  |  | |  | | | | |
 | — | 6:28 | — | — | 6:26 | — | — | 6:24 | — | — | 6:24 | — | — | 6:22 | — | — | 6:20 | — | — |
 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 4 | 4 | 1 | — | — | — | — | — |
Temp °C | 10 | 14 | 15 | 14 | 17 | 18 | 16 | 16 | 16 | 12 | 9 | 8 | 7 | 9 | 10 | 10 | 17 | 16 | 14 |
Feels °C | 7 | 12 | 13 | 13 | 15 | 17 | 14 | 14 | 13 | 11 | 7 | 4 | 3 | 6 | 7 | 6 | 15 | 15 | 12 |
Swell 1 Height (m) Direction Period (s) | S 11 | S 12 | S 11 | S 10 | S 9 | S 9 | NE 6 | SE 10 | NE 8 | NE 6 | ESE 11 | ESE 10 | SE 9 | ESE 13 | SE 6 | ESE 11 | SE 12 | SE 11 | S 8 |
| kJ | 826 | 675 | 451 | 284 | 169 | 99 | 20 | 35 | 28 | 16 | 46 | 39 | 39 | 151 | 66 | 215 | 202 | 126 | 196 |
Swell 2 Height (m) Direction Period (s) | E 12 | E 11 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | S 8 | S 8 | SE 8 | SE 10 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SE 12 | SE 6 | ESE 5 | SSW 15 | SE 11 |
| kJ | 3 | 2 | 77 | 46 | 43 | 20 | 35 | 12 | 10 | 26 | 41 | 41 | 56 | 50 | 209 | 32 | 3 | 225 | 104 |
Swell 3 Height (m) Direction Period (s) | — | — | E 9 | NE 4 | ENE 4 | SE 11 | SE 8 | NE 7 | S 8 | SSW 15 | SSW 4 | NE 5 | ESE 15 | ENE 5 | SSW 16 | S 15 | NE 12 | NE 9 | S 15 |
| kJ | — | — | 2 | 2 | 1 | 19 | 16 | 12 | 12 | 43 | 3 | 1 | 21 | 3 | 48 | 157 | 5 | 3 | 155 |
Wind waves Height (m) Direction Period (s) | — | N 3 | NE 2 | NNE 4 | NNE 4 | NE 5 | — | — | — | — | — | SSW 5 | S 7 | SSE 6 | — | — | SSW 6 | S 8 | ENE 8 |
| kJ | — | 3 | 1 | 7 | 10 | 65 | — | — | — | — | — | 76 | 352 | 146 | — | — | 272 | 398 | 6 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 13 | 0 | 13 | 0 | 0 | 0 | 0 | 0 | 161 | 0 | 19 | 0 | 19 | 0 | 23 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Kaikoura and Marlborough | |||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||
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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.
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