Surf Forecasts:
Mangamaunu surf forecast from 7 Sep 2026:
- Best quality surf: Saturday 12 Sep, 9AM (local time) - 5ft (1.5m), 12s period, S swell with glassy winds.
- Most powerful swell: Saturday 12 Sep, 6PM (local time) - 8ft (2.5m), 15s period, S swell with 2,982 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 9PM (local time) - 4ft (1.2m), 9s period with E 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 Tuesday (Sep 08) at 9PM. The primary swell is predicted to be 1.2m and 9s period with a secondary swell of 0.5m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Mangamaunu in the next 16 days are 2.5m 15s and forecast to arrive on Saturday (Sep 12) 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 1.4m 6s period and expected on Thursday (Sep 10) at 3PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 8th Sep) | 4ft (1.2m) 9s |
| Best Surf | 9AM (Sat 12th Sep) | 5ft (1.5m) 12s |
| Most Powerful | 6PM (Sat 12th Sep) | 8ft (2.5m) 15s |
Table - best surf conditions forecast for Mangamaunu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down what's coming our way for this stretch of coast. It's going to be a bit of a slow start, but there's some serious potential hiding in the distance.
For the first part of the week, through the 11th, the surf is small and pretty gutless. Water temp is around 52°F, which is pretty normal for this time of year. The winds are mostly cross-shore and onshore, making things lumpy. The swell is weak, with a combined energy reading under 320, so you’ll be fighting for scraps. The 9th might have a couple of waist-high waves, but it’s going to be choppy. Not the time to skip work.
But hold on. Everything changes this coming Saturday the 12th. A solid, long-period southern swell starts rolling in. The morning is the pick: dead glassy conditions with sets building to head-high at 5ft. The energy jumps way up (1095), and the point at Mangamaunu is going to be throwing out some proper lines. This is the one to circle on the calendar.
The swell peaks in the afternoon, pushing up to 8ft. That’s a big, powerful wave, and with the wind turning onshore, it’s going to be for experts only. Sunday the 13th is still firing with 6ft surf and a light offshore wind, keeping the face clean. This whole window, from the 12th to the 14th, is the standout of the forecast.
After that, we settle down a bit. The 15th and 16th see cleaner conditions and smaller waves, around 3-4ft, but they’ll be fun and glassy. The middle of that second week, the 17th and 18th, gets blown out with strong winds, so you can keep that stretch free. The 18th afternoon looks glassy again with 4ft, and there's a cleaner window on the 19th and 20th, but the size drops off to under 3ft.
So, here’s the long and short of it: make your plans for Saturday the 12th. That’s the day with the real power and the clean conditions to match. The rest is a waiting game for those magic windows.
Rusty, signing off.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon morning. Very mild (max 14°C on Wed afternoon, min 6°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Thu afternoon. Very mild (max 12°C on Fri afternoon, min 4°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
AM | PM | 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) | SSE 6 | SE 6 | S 9 | S 9 | E 8 | E 9 | E 9 | ENE 8 | E 8 | E 8 | SSW 15 | SSW 18 | S 18 | S 17 | S 16 | S 12 | S 15 | S 15 | S 15 | S 15 | S 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 150 | 93 | 81 | 57 | 127 | 230 | 210 | 286 | 107 | 80 | 71 | 115 | 307 | 217 | 137 | 594 | 2760 | 2469 | 1610 | 1246 | 999 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross-on | cross-on | glassy | cross-on | cross-on | cross-off | cross-off | cross-off | off | cross | cross | cross | glassy | cross-on | off | cross-off | on | on |
High Tide | 1:01PM1.64m | 1:26AM1.49m | 1:57PM1.67m | 2:21AM1.51m | 2:52PM1.67m | 3:16AM1.53m | 3:45PM1.67m | 4:09AM1.54m | 4:38PM1.64m | 5:02AM1.55m | 5:29PM1.60m | 5:54AM1.55m | 6:20PM1.55m | ||||||||
Low Tide | 7:20PM0.12m | 7:35AM0.07m | 8:16PM0.10m | 8:31AM0.05m | 9:11PM0.08m | 9:27AM0.03m | 10:04PM0.07m | 10:22AM0.03m | 10:56PM0.07m | 11:17AM0.05m | 11:48PM0.08m | 12:11PM0.08m | 00:38AM0.11m | ||||||||
 |  |  | |  |  |  | | | |  |  | | | | | | | | | | |
 | 6:41 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — |
 | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — |
mm | 3 | — | — | — | — | — | — | — | — | 3 | 8 | 1 | — | — | 1 | — | — | — | — | — | — |
Temp °C | 8 | 8 | 7 | 10 | 9 | 9 | 12 | 14 | 11 | 9 | 6 | 6 | 11 | 12 | 9 | 11 | 12 | 11 | 14 | 13 | 10 |
Feels °C | 5 | 5 | 3 | 7 | 6 | 7 | 8 | 11 | 8 | 4 | 2 | 2 | 8 | 9 | 5 | 8 | 8 | 8 | 12 | 11 | 9 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SE 6 | ESE 6 | E 6 | S 9 | E 9 | E 9 | S 8 | E 8 | E 8 | E 8 | E 8 | S 6 | S 7 | S 16 | S 12 | S 15 | S 15 | S 15 | S 15 | S 14 |
| kJ | 29 | 93 | 47 | 31 | 52 | 230 | 210 | 21 | 107 | 80 | 60 | 32 | 83 | 43 | 137 | 594 | 2760 | 2469 | 1610 | 1246 | 999 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | S 9 | S 9 | S 9 | S 13 | S 8 | S 8 | S 19 | NE 5 | SSW 16 | SSW 15 | SSW 18 | S 18 | S 17 | E 7 | S 15 | ENE 13 | NE 12 | NE 12 | NE 12 | NE 12 |
| kJ | 48 | 40 | 81 | 57 | 3 | 32 | 21 | 7 | 14 | 49 | 71 | 112 | 307 | 217 | 4 | 484 | 17 | 24 | 6 | 6 | 5 |
Swell 3 Height (m) Direction Period (s) | E 10 | SSW 15 | S 14 | E 8 | SW 13 | S 21 | S 20 | S 12 | S 8 | SSW 8 | S 20 | SSW 14 | E 8 | ESE 7 | ENE 13 | ENE 13 | — | ENE 12 | — | NE 9 | NE 12 |
| kJ | 2 | 21 | 16 | 10 | 7 | 9 | 8 | 3 | 11 | 12 | 32 | 20 | 10 | 11 | 17 | 17 | — | 15 | — | 3 | 6 |
Wind waves Height (m) Direction Period (s) | SSE 6 | — | — | NE 3 | E 8 | — | NE 2 | ENE 8 | — | SSW 5 | SSW 6 | S 6 | — | NE 3 | S 4 | — | — | — | — | NNE 3 | — |
| kJ | 150 | — | — | 7 | 127 | — | 1 | 286 | — | 27 | 122 | 115 | — | 1 | 46 | — | — | — | — | 4 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 125 | 23 | 4 | 13 | 13 | 0 | 13 | 100 | 0 | 12 | 12 | 0 | 13 | 4 | 73 | 0 | 100 | 0 | 0 | 13 | 4 |
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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