Castlepoint - The Gap Surf Break

Lat Long: 40.91° S 176.22° E

Castlepoint - The Gap Surf Forecast and Surf Report

Issued: 11 pm 17 Aug 2026 (local time)

Forecast update in  hr  min

Today's Castlepoint - The Gap sea temperature is
11.9° C
0.8° 

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 17 Aug 2026:

  • Best quality surf: Wednesday 19 Aug, 9AM (local time) - 15ft (4.5m), 12s period, S swell with cross-shore winds.
  • Most powerful swell: Wednesday 19 Aug, 12PM (local time) - 15ft (4.5m), 14s period, S swell with 8,047 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 19 Aug, 9AM (local time) - 15ft (4.5m), 12s 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 9AM. The primary swell is predicted to be 4.5m and 12s period with a secondary swell of 4.0m and 11s. 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 Sunday (Aug 23) at 6PM.

Wave TypeTime (NZST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Wed 19th Aug)15ft (4.5m) 12s
Best Surf 9AM (Wed 19th Aug)15ft (4.5m) 12s
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, surfers, Rusty here. Let’s have a look at what’s lining up for us.

Alright, so we’ve got a bit of a wait on our hands. The forecast is pretty grim for the next few days, with a big, powerful swell arriving mid-week that’s just too damn big for our little corner of the coast. We’re looking at a solid gap of no good surf until things start to settle down.

The first real window of opportunity, and honestly the standout of the whole outlook, is Thursday morning, the 20th of August at Castlepoint - The Gap. The swell has dropped back to a more manageable 8 ft from the SSW, and the wind is a light WSW cross-off breeze. It’s going to be clean. The water temp is sitting at 53°F, which is about 1°F cooler than normal for this time of year, so nothing too out of the ordinary but you’ll want a decent wetsuit. The combined swell energy is decent at 2412, meaning there’s some proper push behind it. This is the one to aim for if you’re intermediate and up.

The rest of that week is a bit of a mixed bag. Friday morning the 21st sees a 5 ft S swell with a long 15-second period and clean NW offshore winds, but the energy is a bit weaker at 1200. It’s surfable, but not the same quality as Thursday. That long period will make it a bit walled and straight at the beach, but The Gap is a reef setup, so it should handle it well.

Then the swell drops right off for the weekend and into the early part of the following week. The 22nd and 23rd are basically write-offs with tiny, weak waves. By the 24th and 25th, we see a new SSW swell building, but the wind is howling at 25 mph from the WNW. That’s a strong offshore, which will keep the surface clean, but it’s going to be a battle to get out and hold your position. The swell is 7 ft to 8 ft with a 15-second period, which is big and powerful, but the wind is so strong it’s going to be a struggle for all but the fittest and strongest. The energy readings are high, around 2133 and 2311, but the comments say it’s marginal.

Looking further out, the 26th of August Wednesday morning offers a 5 ft S swell with a moderate 12 mph offshore wind and clean faces. The energy is a modest 565. It’s a decent option, but nothing to write home about.

The final notable mention is Friday morning, the 28th of August. We’ve got a 6 ft SSW swell with a long 15-second period and a light N cross-off breeze. The energy is solid at 1430. It’s clean and punchy, but because it’s so far out, there’s a bit of uncertainty. It’s promising, but don’t lock in your plans just yet.

Truth be told, the first week is a bust. The best bet is that Thursday morning, the 20th. After that, it’s a game of watching the wind. When it’s not blowing a gale, the swell is too small, and when the swell is there, the wind is too strong. It’s one of those stretches.

Stay stoked, and keep an eye on that Thursday session.

- Rusty

Short Range Forecast

Light rain (total 9mm), mostly falling on Tue afternoon. Very mild (max 11°C on Thu morning, min 6°C on Mon night). Winds decreasing (strong winds from the SSW on Tue night, light winds from the SSE by Thu afternoon).

Days 5-7 Weather Summary

Light rain (total 2mm), mostly falling on Sat night. Very mild (max 16°C on Sun morning, min 9°C on Thu night). Winds increasing (calm on Thu night, strong winds from the WNW by Sat morning).

Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
1
0
!
2
3
4
1
2
3
2
0
0
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.6
SE
8
3
SSW
8
4
S
10
5
S
12
4.5
S
12
3
S
15
2.5
SSW
14
2.4
SSW
13
1.6
S
8
1.5
S
13
1.6
S
15
1.4
S
13
1.1
S
12
0.9
S
11
0.9
S
11
0.7
S
10
0.5
S
10
0.4
S
10
0.3
SSW
16
Wave Graph
Metric surfscale
Energy kJ
338
1344
3328
6377
5793
3582
2610
1808
354
726
1209
704
353
198
191
106
48
32
50
Wind (km/h)
20
WSW
40
SW
45
SW
50
SSW
30
SSW
25
SSW
20
WSW
10
WSW
15
SSE
10
NNE
25
NW
20
NW
25
NW
45
WNW
40
WNW
35
NW
30
WNW
35
WNW
10
WNW
Wind State
cross-off
cross-off
cross-off
cross
cross
cross
cross-off
cross-off
cross-on
cross
off
off
off
off
off
off
off
off
off
High Tide
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
1:20PM1.26m
1:39AM1.14m
Low Tide
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
7:03AM0.24m
7:40PM0.21m
cloud
rain showers
rain showers
light rain
cloud
cloud
part cloud
part cloud
cloud
part cloud
clear
clear
clear
part cloud
part cloud
rain showers
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:01
7:00
6:58
6:56
6:54
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:37
5:37
5:38
5:39
5:40
5:42
 mm
1
4
4
2
Temp °C
9
9
8
8
9
9
9
11
10
10
13
14
11
13
15
14
16
15
12
Feels °C
1
0
-2
-1
3
3
5
8
7
7
9
9
4
5
9
7
10
7
4
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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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