Mangamaunu Surf Break

Lat Long: 42.31° S 173.75° E

Mangamaunu Surf Forecast and Surf Report

Issued: 5 pm 20 Jul 2026 (local time)

Forecast update in  hr  min

Today's Mangamaunu sea temperature is
11.5° C
0.7° 

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


Mangamaunu surf forecast from 20 Jul 2026:

  • Best quality surf: Tuesday 21 Jul, 3AM (local time) - 5.5ft (1.7m), 15s period, S swell with cross-offshore winds.
  • Most powerful swell: Tuesday 21 Jul, 3AM (local time) - 5.5ft (1.7m), 15s period, S swell with 1,229 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 21 Jul, 3AM (local time) - 5.5ft (1.7m), 15s 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 Tuesday (Jul 21) at 3AM. The primary swell is predicted to be 1.7m and 15s period with a secondary swell of 0.5m and 11s. Another secondary swell of 0.5m and 3s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Mangamaunu in the next 16 days are 1.7m 15s and forecast to arrive on Tuesday (Jul 21) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 5s period and expected on Saturday (Jul 25) at 3AM.

Wave TypeTime (NZST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Tue 21st Jul)5.5ft (1.7m) 15s
Best Surf 3AM (Tue 21st Jul)5.5ft (1.7m) 15s
Most Powerful 3AM (Tue 21st Jul)5.5ft (1.7m) 15s

Table - best surf conditions forecast for Mangamaunu over the next 16 days.


The Lowdown

Alright, this is Rusty. Let's get into it.

The first few days are a bit of a waiting game, but once the wind and swell line up, this spot really fires. The main event is a solid, long-period South swell that pushes through the middle of the window, and we’ve got a couple of real standout sessions.

We start off Monday, July 20th with a bit of a tease. The swell is a solid 7ft from the South, running on a very long 18-second period, which gives it some serious grunt. The combined wave energy is a massive 3140, so it’s a powerful groundswell. But the wind is from the East, putting it onshore, and the report calls it marginal. It’s a big, lumpy setup for now.

Things change fast. Tuesday morning, July 21st is where it starts to get interesting. The swell drops to 5ft from the South, but the period is still a solid 14 seconds. The wind swings to the West, giving us clean offshore conditions. The energy is a moderate 923. This is a really good wave, but it’s going to be for advanced surfers only. The crowd is rare here, so you’ll have plenty of room.

Tuesday afternoon is a dream. The swell settles to 5ft from the South, period at 13 seconds, and the wind goes completely flat. Glassy. The energy is 733. Conditions are described as "very good," and for a point break like Mangamaunu, that’s as good as it gets. This is the best of the first week.

The next few days drop off quickly. Wednesday, July 22nd sees the swell drop to 3ft, and by Thursday, we’re down to knee-high dribble. The wind is good, but there’s no push. There’s a long gap of poor to no surf from the 23rd through the 25th. On Saturday, July 25th, the wind is howling from the WSW at 19 mph, and while there’s a 5ft swell, it’s short-period slop. Not worth it.

The second week brings a new pulse. Monday, July 27th is a real standout. The morning shows a 4ft swell from the East with a 15-second period, clean with a cross-offshore wind and an energy of 799. The afternoon gets even better: 5ft from the ESE, 13-second period, light wind, and an energy of 1042. The report calls it "excellent for experienced surfers." This is the best of the second week, but it’s a long-range call, so it’s promising but not guaranteed.

Tuesday, July 28th is a bit messy with cross-on winds, but the swell is similar. Then Wednesday, July 29th cleans up again with a 4ft ESE swell and light offshore winds. The energy is 588.

There’s another small window at the very end. Sunday, August 2nd is a big one. The morning brings a 10ft swell from the South, period of 10 seconds, and glassy conditions. The energy is a massive 2059. That is a big wave. It’s for experts only, and it’s at the very end of the forecast, so treat it with caution. The period is short, so it might be a bit lumpy, but on a point break, it could still be a beast.

The water temperature is 53°F with a slight anomaly of 1°F warmer, so it’s about average for this time of year at Mangamaunu. Bring a good suit.

The standout sessions are Tuesday afternoon, July 21st for the glassy, clean perfection, and Monday afternoon, July 27th for the punchy, longer-period swell. The big one on August 2nd is a promise for the brave.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 14°C on Thu morning, min 7°C on Mon afternoon). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 26mm), heaviest during Sun morning. Very mild (max 16°C on Fri afternoon, min 5°C on Fri night). Winds increasing (calm on Thu afternoon, fresh winds from the SSW by Sun morning).

Mon
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
5
3
3
3
2
2
1
0
1
0
0
0
0
1
0
2
2
0
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.1
S
18
1.8
S
15
1.5
S
14
1.4
S
13
1.1
S
12
0.9
S
11
0.5
S
13
0.4
SSE
13
0.8
NNE
5
0.3
SSW
9
0.3
SSW
8
0.3
S
9
0.3
S
9
0.3
SSW
16
1.6
S
8
1.3
S
8
0.6
ESE
16
0.8
ESE
14
0.8
ESE
14
0.8
ESE
13
Wave Graph
Metric surfscale
Energy kJ
2890
1472
844
663
336
203
89
55
29
15
12
13
15
48
294
224
169
268
261
222
Wind (km/h)
5
E
10
N
5
W
0
SE
5
W
5
SW
5
SE
10
N
5
NW
0
NNE
10
NW
10
NW
5
WNW
5
NW
30
WSW
10
ENE
10
W
35
SSW
20
WSW
10
NNW
Wind State
on
cross
off
glassy
off
cross-off
glassy
cross
cross-off
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross-on
off
cross-off
cross-off
cross-off
High Tide
9:55PM1.52m
10:26AM1.47m
10:48PM1.45m
11:19AM1.45m
11:40PM1.39m
12:10PM1.43m
00:30AM1.35m
12:59PM1.43m
1:18AM1.33m
1:45PM1.43m
2:04AM1.32m
2:30PM1.44m
2:48AM1.32m
Low Tide
4:14AM0.13m
4:39PM0.19m
5:04AM0.18m
5:32PM0.25m
5:52AM0.23m
6:23PM0.30m
6:39AM0.27m
7:13PM0.33m
7:24AM0.30m
8:00PM0.34m
8:09AM0.31m
8:46PM0.34m
clear
clear
part cloud
cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
rain showers
rain showers
part cloud
cloud
heavy rain
rain showers
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:46
7:45
7:43
7:43
7:41
7:41
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:15
5:16
5:16
5:17
5:19
5:20
5:21
 mm
3
1
22
3
Temp °C
10
7
11
11
10
11
11
10
14
15
12
15
16
11
7
9
9
6
5
4
Feels °C
7
4
9
9
7
8
9
7
12
13
9
12
14
8
2
5
6
-2
-1
0
  • Map Icons:
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  • 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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