Castlepoint - The Gap Surf Break

Lat Long: 40.91° S 176.22° E

Castlepoint - The Gap Surf Forecast and Surf Report

Issued: 11 pm 11 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlepoint - The Gap sea temperature is
12.1°C
0.6° 

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 11 Sep 2026:

  • Best quality surf: Saturday 12 Sep, 6PM (local time) - 11ft (3.5m), 14s period, S swell with glassy winds.
  • Most powerful swell: Saturday 12 Sep, 6PM (local time) - 11ft (3.5m), 14s period, S swell with 4,529 kJ wave energy.
  • Next surfable swell (1★+): Saturday 12 Sep, 6PM (local time) - 11ft (3.5m), 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 Saturday (Sep 12) at 6PM. The primary swell is predicted to be 3.5m and 14s period with a secondary swell of 0.4m and 13s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Castlepoint - The Gap in the next 16 days are 3.5m 14s and forecast to arrive on Saturday (Sep 12) at 6PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Thursday (Sep 17) at 9PM.

Wave TypeTime (NZST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Sat 12th Sep)11ft (3.5m) 14s
Best Surf 6PM (Sat 12th Sep)11ft (3.5m) 14s
Most Powerful 6PM (Sat 12th Sep)11ft (3.5m) 14s

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


The Lowdown

Righto, let’s have a look at what’s on the cards for Castlepoint – The Gap over the next couple of weeks. It’s a bit of a mixed bag, and there’s a fair gap of flatness to sit through before things get properly interesting.

The swell energy is moderate to strong during the first few days, with the combined swell energy hitting up to 996 (moderate) on Saturday morning, but conditions are messy with a cross-on breeze messing things up. Saturday afternoon looks a bit more promising with 10ft S swell at 14 seconds and a strong combined swell energy of 3515, though the wind is cross-shore with a bit of chop.

Sunday morning 13th September is where the first proper window opens up. You’ve got a 7ft S swell (14 seconds) and a light offshore breeze, making it clean. The combined swell energy is 1672, which is moderate to strong. The setup is fairly consistent and the Gap is sheltered, so it holds a bit of size well. The water temperature feels about average for the time of year, nothing too unusual.

Monday morning 14th September has a glassy dawn with 6ft S swell, but the energy drops a bit. Still a fine session if you’re keen on mellow waves.

Then from mid-Tuesday 15th, the surf fades fast. Through to the end of the week and into the next, the swell drops to under 2ft and the combined energy sits below 100 – that’s weak. Thursday 17th, Friday 18th, just tiny barely-surfable dribble with occasional poor wind. That stretch of flatness runs for about 5 days in a row.

The next real standout comes Saturday morning 19th September. A clean 5ft SSW swell (14 seconds) is matched with offshore WNW wind, making for good, clean conditions. Combined swell energy is 1319 – solid moderate. The break is fairly consistent and you might see a few others around as crowds are listed as often, but with that offshore wind and a well-defined S groundswell, it’s a classic morning.

But the true standout of the whole window is Saturday 26th September. You’re looking at a clean 8ft S swell with a 16-second period – very long period groundswell. Combined energy is 3371, which is strong. The wind is offshore and clean. This is for experienced surfers only due to the size, but the Gap is a point-like reef setup and those long-period lines will wrap in beautifully, reforming into proper walls. It’s still a week and a half away, so keep an eye on it, but this one has serious quality written all over it.

To sum it up: Sunday 13th is the first good clean morning, and Saturday 26th September is the big-ticket session that could be absolute magic if the forecast holds.

Rusty.

Short Range Forecast

Light rain (total 3mm), mostly falling on Sat morning. Very mild (max 12°C on Sun morning, min 8°C on Sat morning). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 16°C on Tue morning, min 9°C on Mon night). Wind will be generally light.

Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
3
3
3
2
3
2
0
1
1
0
0
0
0
0
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)
0.8
SSW
17
1.4
SSW
16
3
S
14
3
S
15
2.1
S
14
2.5
SSW
13
2.3
S
12
1.8
S
12
1.6
S
11
1.3
S
10
0.9
S
9
0.8
S
9
0.6
S
9
0.5
S
8
0.3
SSW
13
0.2
SSW
14
0.4
SE
12
0.4
SE
11
0.8
SSW
6
Wave Graph
Metric surfscale
Energy kJ
399
917
3472
3620
1657
2318
1519
926
655
354
129
104
55
34
33
18
37
30
55
Wind (km/h)
15
W
20
SSE
15
SSW
20
NNW
10
W
25
S
5
WNW
0
WSW
15
NE
10
NNW
15
NNW
20
NNE
25
NNW
25
NW
25
NW
25
NW
20
NW
20
NW
25
WNW
Wind State
cross-off
cross-on
cross
cross-off
cross-off
cross
off
glassy
cross
cross-off
cross-off
cross
cross-off
off
off
off
cross-off
cross-off
off
High Tide
5:30AM1.27m
5:54PM1.34m
6:25AM1.30m
6:50PM1.31m
7:19AM1.32m
7:45PM1.29m
8:11AM1.34m
8:37PM1.28m
8:59AM1.34m
9:26PM1.27m
9:46AM1.32m
10:12PM1.25m
Low Tide
11:19PM0.07m
11:43AM-0.01m
00:17AM0.11m
12:40PM0.03m
1:11AM0.14m
1:36PM0.08m
2:01AM0.17m
2:31PM0.13m
2:50AM0.20m
3:25PM0.16m
3:37AM0.22m
4:14PM0.18m
part cloud
light rain
part cloud
part cloud
clear
clear
part cloud
clear
part cloud
part cloud
clear
clear
clear
part cloud
clear
clear
part cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:22
6:20
6:18
6:16
6:15
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:00
6:01
6:02
6:04
6:05
6:06
 mm
3
Temp °C
11
8
9
9
12
11
9
12
12
11
16
16
12
15
16
13
15
15
13
Feels °C
7
3
5
5
6
5
6
9
8
8
12
12
7
10
11
8
11
11
7
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  • 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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