Mangamaunu Surf Break

Lat Long: 42.31° S 173.75° E

Mangamaunu Surf Forecast and Surf Report

Issued: 11 am 14 Aug 2026 (local time)

Forecast update in  hr  min

Today's Mangamaunu sea temperature is
10.1° C
0.4° 

Mangamaunu surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


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 TypeTime (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 Forecast

Heavy 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 Summary

Mostly 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
Rating
(10 max)
1
1
1
1
0
1
1
2
2
3
2
3
2
3
4
4
4
4
3
3
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
ENE
8
0.6
ENE
8
0.9
E
7
0.4
SSW
17
0.9
E
8
2.5
SSW
6
2.5
S
8
3
S
8
2.5
S
8
2.4
SSE
8
2.2
SSE
8
1.7
SE
11
2.5
S
8
2.4
S
8
2.5
S
9
2.5
S
10
1.9
S
9
2.5
S
10
1.9
S
11
1.7
S
12
1.4
S
11
Wave Graph
Metric surfscale
Energy kJ
79
49
85
94
90
461
892
1034
903
789
699
635
717
783
1067
1238
562
1179
890
792
482
Wind (km/h)
5
SSW
5
SE
5
N
15
SW
20
SSW
30
SW
30
SW
35
SSW
25
SW
20
WSW
20
SSW
20
W
30
SW
20
SW
15
W
15
WSW
15
SSW
15
SW
10
W
10
SSE
10
NNW
Wind State
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
clear
clear
clear
part cloud
light rain
heavy rain
mod rain
light rain
rain showers
clear
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:18
7:18
7:16
7:15
7:13
7:11
7:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
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
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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