Surf Forecasts:
Mangamaunu surf forecast from 14 Aug 2026:
- Best quality surf: Monday 17 Aug, 6PM (local time) - 8ft (2.5m), 10s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 19 Aug, 6AM (local time) - 8ft (2.5m), 10s period, S swell with 1,290 kJ wave energy.
- Next surfable swell (1★+): Friday 14 Aug, 6PM (local time) - 2ft (0.6m), 8s period with ESE 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 Friday (Aug 14) at 6PM. The primary swell is predicted to be 0.6m and 8s period with a secondary swell of 0.6m and 7s. 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 10s and forecast to arrive on Wednesday (Aug 19) 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 1.6m 5s period and expected on Saturday (Aug 15) at 9PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Fri 14th Aug) | 2ft (0.6m) 8s |
| Best Surf | 6PM (Mon 17th Aug) | 8ft (2.5m) 10s |
| Most Powerful | 6AM (Wed 19th Aug) | 8ft (2.5m) 10s |
Table - best surf conditions forecast for Mangamaunu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s cookin’ at Mangamaunu for the next couple weeks.
The short-term is a bit lackluster, but patience will get you some gems. We’ve got a long run of small to moderate surf with windy conditions for the first five or six days, but it cleans up nicely into the second week with some real quality on the horizon.
Friday the 14th is a non-starter. Tiny 3 ft from the ENE at 8 seconds with weak energy (126) and cross-off wind. It’s clean but barely surfable. By Saturday the 15th, the swell drops even smaller at 1 ft, though the period jumps to a massive 17 seconds, giving it a weird, lanky feel. Not worth paddling out. Sunday the 16th sees the size jump to 8 ft from the S, but that’s accompanied by 30 km/h cross-off wind and energy reading 972. It's powerful but messy and getting into expert territory at 10 ft in the afternoon. The whole first week is plagued by moderate to fresh cross-off winds, keeping conditions average.
Now, hang on tight. Wednesday the 19th is where it gets interesting. We’ve got a solid 8 ft S swell at 10 seconds with a clean offshore wind (WSW, 15 km/h). The combined energy hits 2408 – that’s strong wave energy. This is for the experienced crew, but it’s gonna be proper. The morning is the standout, with clean, powerful lines. Thursday the 20th holds decent at 6 ft, but winds shift cross-on in the afternoon.
The absolute best on offer, though, is Friday the 21st and Saturday the 22nd. Friday morning brings a 4 ft S swell at 11 seconds with glass conditions – dead calm, no wind. The energy is moderate (455) but the quality will be pure. Saturday morning is even smaller at 3 ft but also glassy, with a 13-second period. Expect clean, peeling waves with very little wind. This is the window for a classic Mangamaunu session.
The last few days of the month fade into smaller, weaker energy, with a couple of 1 ft days. Thursday the 27th morning has a little 3 ft bump with offshore wind and energy reading 211, worth a look for a quick paddle. Saturday the 29th afternoon brings a final pulse: 5 ft S swell with a 16-second period and gentle cross-off wind – another call for experienced surfers.
This is not a beginners’ window. The 8 ft+ days on the 19th are for experts only, and the cleaner glassy days from the 21st are better for intermediate and above. Keep an eye on that glassy Friday – that’s the one.
Rusty, signing off.
Short Range ForecastHeavy rain (total 28mm), heaviest during Sat night. Very mild (max 13°C on Fri morning, min 4°C on Sun morning). Winds increasing (calm on Fri afternoon, fresh winds from the SSW by Sat night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 13°C on Wed morning, min 5°C on Mon afternoon). Mainly fresh winds. | ||||||||||||||||||||
Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | |||||||||||||||
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) | ENE 8 | ENE 8 | E 7 | SSW 17 | E 8 | SSW 6 | S 8 | S 8 | S 8 | SSE 8 | SSE 8 | SE 11 | S 8 | S 8 | S 9 | S 10 | S 9 | S 10 | S 11 | S 12 | S 11 |
Wave Graph | |||||||||||||||||||||
79 | 49 | 85 | 94 | 90 | 461 | 892 | 1034 | 903 | 789 | 699 | 635 | 717 | 783 | 1067 | 1238 | 562 | 1179 | 890 | 792 | 482 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | off | off | cross-off | cross-off | off | cross-on | cross-off |
High Tide | 5:53PM1.71m | 6:18AM1.57m | 6:46PM1.66m | 7:12AM1.55m | 7:39PM1.59m | 8:07AM1.52m | 8:32PM1.52m | 9:01AM1.49m | 9:25PM1.45m | 9:54AM1.47m | 10:17PM1.40m | 10:45AM1.44m | 11:08PM1.35m | ||||||||
Low Tide | 11:36AM-0.02m | 00:14AM0.03m | 12:32PM0.01m | 1:07AM0.05m | 1:28PM0.06m | 1:59AM0.08m | 2:23PM0.12m | 2:50AM0.13m | 3:17PM0.18m | 3:40AM0.19m | 4:10PM0.24m | 4:29AM0.24m | 5:01PM0.29m | ||||||||
7:18 | — | — | 7:18 | — | — | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:11 | — | — | 7:09 | — | — | |
— | 5:39 | — | — | 5:40 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | |
mm | — | — | — | — | 1 | 12 | 8 | 3 | 4 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 12 | 12 | 10 | 8 | 5 | 6 | 6 | 7 | 7 | 7 | 9 | 10 | 10 | 13 | 12 | 8 | 11 | 10 | 8 |
Feels °C | 11 | 11 | 11 | 8 | 6 | 2 | -2 | -2 | -2 | 0 | 1 | 1 | 2 | 5 | 5 | 8 | 8 | 4 | 8 | 7 | 6 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 8 | E 7 | E 7 | E 8 | ENE 9 | ENE 9 | E 9 | ESE 10 | SSW 15 | SSW 14 | SE 11 | E 10 | E 10 | S 9 | S 10 | S 14 | S 10 | S 11 | S 12 | S 11 |
79 | 49 | 85 | 73 | 90 | 58 | 49 | 63 | 173 | 231 | 218 | 635 | 265 | 125 | 750 | 797 | 416 | 895 | 890 | 792 | 482 | |
Swell 2 Height (m) Direction Period (s) | ESE 7 | ESE 7 | ESE 14 | SSW 17 | SSW 16 | ESE 9 | ESE 8 | E 8 | SE 15 | ESE 15 | ESE 15 | E 11 | SE 10 | SE 9 | E 10 | S 15 | SE 13 | S 14 | SE 11 | ESE 13 | S 16 |
21 | 31 | 20 | 94 | 89 | 26 | 14 | 6 | 9 | 23 | 22 | 155 | 139 | 68 | 67 | 343 | 44 | 106 | 31 | 18 | 130 | |
Swell 3 Height (m) Direction Period (s) | SE 13 | S 3 | S 18 | ESE 13 | ESE 13 | ESE 13 | ESE 13 | — | SE 15 | ESE 15 | — | S 14 | ESE 14 | SE 13 | S 14 | E 10 | E 9 | SE 12 | — | ESE 11 | SE 13 |
26 | 2 | 24 | 17 | 17 | 17 | 17 | — | 9 | 23 | — | 134 | 18 | 26 | 100 | 30 | 15 | 37 | — | 11 | 40 | |
Wind waves Height (m) Direction Period (s) | SSW 3 | SSW 3 | — | — | SSW 4 | SSW 6 | S 8 | S 8 | S 8 | SSE 8 | SSE 8 | SW 4 | S 8 | S 8 | S 9 | S 10 | S 9 | S 10 | — | ENE 2 | NNE 4 |
1 | 4 | — | — | 23 | 461 | 892 | 1034 | 903 | 789 | 699 | 16 | 717 | 783 | 1067 | 1238 | 562 | 1179 | — | 1 | 7 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 23 | 0 | 0 | 12 | 157 | 30 | 173 | 30 | 12 | 19 | 0 | 104 | 12 | 0 | 0 | 0 | 0 | 0 | 23 | 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.











