Castlepoint - The Gap Surf Break

Lat Long: 40.91° S 176.22° E

Castlepoint - The Gap Surf Forecast and Surf Report

Issued: 5 pm 16 Aug 2026 (local time)

Forecast update in  hr  min

Today's Castlepoint - The Gap sea temperature is
11.7° C
1.0° 

Castlepoint - The Gap surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Castlepoint - The Gap surf forecast from 16 Aug 2026:

  • Best quality surf: Wednesday 19 Aug, 12PM (local time) - 15ft (4.5m), 14s period, S swell with cross-shore winds.
  • Most powerful swell: Wednesday 19 Aug, 12PM (local time) - 15ft (4.5m), 14s period, S swell with 8,130 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 19 Aug, 12PM (local time) - 15ft (4.5m), 14s period with S swell.

Best Forecast Surf Conditions for Castlepoint - The Gap this week:

The surf forecast for Castlepoint - The Gap over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 19) at 12PM. The primary swell is predicted to be 4.5m and 14s period with a secondary swell of 4.0m and 14s. Another secondary swell of 0.3m and 14s is also forecast. The wind is predicted to be cross-shore as the swell arrives.

The most powerful waves expected at Castlepoint - The Gap in the next 16 days are 4.5m 14s and forecast to arrive on Wednesday (Aug 19) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Aug 22) at 9AM.

Wave TypeTime (NZST) & Date Wave Height & Period
Next good surf (1 star+)12PM (Wed 19th Aug)15ft (4.5m) 14s
Best Surf12PM (Wed 19th Aug)15ft (4.5m) 14s
Most Powerful12PM (Wed 19th Aug)15ft (4.5m) 14s

Table - best surf conditions forecast for Castlepoint - The Gap over the next 16 days.


The Lowdown

Alright folks, Rusty here with a look at what’s on the menu at The Gap (Castlepoint).

To be straight with you, the next week or so is a tough watch. We’ve got plenty of swell energy, but the wind is just wrecking it for a paddle surfer. Starting Sunday the 16th, a strong southerly breeze is tearing things up, making for messy, poor conditions despite a solid 12ft southerly swell. The water is sitting at 53°, which is a bit colder than normal for this time of year. That combo of strong cross-shore wind and big, unruly swell is a write-off for the boards. Honestly, with the wind and chop, this setup looks more interesting for kite surfing than paddle surfing.

Monday the 17th and Tuesday the 18th are a similar story – the swell stays up over 7ft, but the wind stays on it. Tuesday afternoon even sees a 13ft swell with a near gale blowing. It’s clean, but that’s a lot of power and wind; only for the experts, and even then, it’s a battle.

Things start to look a bit better towards the end of the week. Thursday morning the 20th is the first real glimmer of hope. We’ve got a clean 5ft southerly groundswell (13-second period) with a light offshore westerly breeze. The combined energy is moderate (975). It’s not huge, but it’s clean and rideable, and for a sheltered spot like The Gap, that offshore wind is gold. Friday morning the 21st also looks clean with a moderate offshore northwesterly and a 5ft southerly groundswell (704 energy). These are the windows to get out for a fun, uncrowded session.

We hit a flat spell from Saturday the 22nd through Monday the 24th. The swell drops right away, with energy readings down to 66 and 46 on the Sunday. The wind is offshore but it’s too strong, and there’s just not enough push. A three-day gap of no real surf to speak of.

Now, for the true standout. Hold onto your boardies, because Thursday the 27th of August is the one to circle on the calendar. Thursday morning is looking excellent. We have a clean 6ft southerly groundswell, but the period is a very long 13 seconds, offering proper energy and shape. The wind is a gentle offshore westerly, meaning it will be glassy and clean. The combined swell energy is strong (1307). The Gap loves a long-period swell from the south, and with those conditions, it’s going to be the best waves we’ve seen in this outlook. The offshore wind is a major positive, promising clean, lined-up walls. Keep in mind that with a long-period swell like this, the sets can be a bit more spaced out, but the quality will make up for it.

The following Saturday morning the 29th also has some potential with a solid 8ft south swell, light winds, and strong energy (1558), but the Thursday morning is the clear winner.

The very end of the month looks to close out with a return of onshore wind and messy surf. So, get on it Thursday the 27th.

Rusty, signing off.

Short Range Forecast

Light rain (total 7mm), mostly falling on Tue afternoon. Very mild (max 10°C on Tue morning, min 7°C on Mon night). Winds increasing (moderate winds from the WSW on Mon night, near gales from the SSW by Tue night).

Days 5-7 Weather Summary

Light rain (total 3mm), mostly falling on Wed afternoon. Very mild (max 14°C on Fri morning, min 8°C on Wed night). Winds increasing (calm on Thu morning, strong winds from the WNW by Fri night).

Sun
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
1
0
0
0
1
2
3
2
2
2
2
0
1
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3.5
S
10
3
S
9
2.5
SSE
9
2.2
SSE
8
1.5
SE
8
3
SSW
9
4
SSW
10
5
S
12
4
S
12
3
S
14
3
SSW
14
1.6
S
13
1.5
S
12
1.6
S
12
1.4
S
13
1.1
S
12
1.2
S
14
0.9
SSW
12
0.8
SSW
11
0.6
S
10
Wave Graph
Metric surfscale
Energy kJ
2474
1741
1023
699
299
1441
3594
6208
3755
4028
3121
822
628
678
663
339
537
228
161
74
Wind (km/h)
45
S
40
S
30
S
25
SSW
20
WSW
40
SW
50
SSW
45
SSW
30
SSW
25
SW
20
SW
10
W
5
SE
5
NW
20
NW
25
NW
35
WNW
45
WNW
30
WNW
30
NW
Wind State
cross
cross-on
cross
cross
cross-off
cross-off
cross-off
cross
cross
cross-off
cross-off
off
on
glassy
off
cross-off
off
off
off
off
High Tide
8:10PM1.35m
8:38AM1.34m
9:04PM1.33m
9:29AM1.35m
9:55PM1.31m
10:17AM1.34m
10:43PM1.29m
11:05AM1.33m
11:28PM1.26m
11:52AM1.31m
00:11AM1.22m
12:37PM1.28m
00:54AM1.18m
Low Tide
2:32AM0.06m
2:55PM0.03m
3:23AM0.10m
3:50PM0.08m
4:12AM0.13m
4:42PM0.13m
4:59AM0.17m
5:31PM0.16m
5:43AM0.20m
6:17PM0.18m
6:24AM0.22m
6:59PM0.20m
light rain
cloud
cloud
part cloud
part cloud
rain showers
rain showers
light rain
light rain
light rain
part cloud
clear
part cloud
clear
clear
clear
clear
part cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:01
7:01
7:00
6:58
6:56
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:35
5:36
5:37
5:37
5:38
5:39
5:40
 mm
1
1
2
2
1
3
Temp °C
9
9
8
9
8
10
8
8
8
9
9
11
11
9
14
14
12
14
14
14
Feels °C
-2
-1
0
2
0
1
-3
-1
0
4
4
10
9
7
9
8
3
7
9
8
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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 Castlepoint - The Gap Surf forecast

The above surf forecast table for Castlepoint - The Gap provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Castlepoint - The Gap can be found by selecting the local surf guide option on the grey menu. Our Castlepoint - The Gap 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 (Castlepoint - The Gap) 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 Castlepoint - The Gap 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.

Are you planning a holiday in The Wairarapa? If you are looking for accommodation near Castlepoint - The Gap, camping, hotels and holiday cottages in The Wairarapa, consider staying in Masterton which is 48 km (30 miles) away. Other places in and around The Wairarapa where you can find information about places to rent, and car hire include Palmerston North which is 80 km (50 miles) away and Levin, 86 km (53 miles) away.

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