Castlepoint - The Gap Surf Break

Lat Long: 40.91° S 176.22° E

Castlepoint - The Gap Surf Forecast and Surf Report

Issued: 5 pm 01 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlepoint - The Gap sea temperature is
11.9°C
0.7° 

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 1 Sep 2026:

  • Best quality surf: Wednesday 2 Sep, 3AM (local time) - 10ft (3.0m), 13s period, S swell with offshore winds.
  • Most powerful swell: Monday 7 Sep, 6PM (local time) - 18ft (5.5m), 12s period, SSW swell with 7,636 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 2 Sep, 3AM (local time) - 10ft (3.0m), 13s 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 (Sep 02) at 3AM. The primary swell is predicted to be 3.0m and 13s period with a secondary swell of 0.5m and 18s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Castlepoint - The Gap in the next 16 days are 5.5m 12s and forecast to arrive on Monday (Sep 07) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 7s period and expected on Monday (Sep 07) at 12PM.

Wave TypeTime (NZST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Wed 2nd Sep)10ft (3.0m) 13s
Best Surf 3AM (Wed 2nd Sep)10ft (3.0m) 13s
Most Powerful 6PM (Mon 7th Sep)18ft (5.5m) 12s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s shaping up for our local stretch.

We’ve got a bit of a mixed bag over the next couple of weeks. There’s some solid energy coming through, but it’s not all smooth sailing. The first good window is actually on Tuesday afternoon, the 1st of September, with an 12 ft swell from the south, but it’s coming in with a cross-on breeze. That’s a lot of water moving around, with combined wave energy hitting 4631, so it’s pumping, but it’s not the cleanest. The water’s sitting at 53°, which is about 1° cooler than usual for this time of year, so nothing too wild there.

The real standout for the experienced crew is going to be Wednesday morning, the 2nd of September. The Gap (Castlepoint) is the spot. We’ve got a 6 ft south swell with a 17-second period – that’s a proper long period groundswell, and it’s got a clean, moderate offshore wind from the WNW at 16 mph. The combined energy is a hefty 3364, meaning there’s plenty of push. This is excellent surf for those who know what they’re doing. The wave direction is south, but the optimum for this break is ESE, so it’s a bit of a cross-up, but the offshore wind is the key here – it’s going to keep the lines clean. It’s also fairly consistent, so you won’t be waiting around forever.

Later that same Wednesday afternoon, the swell bumps up to 8 ft, still with a fresh offshore from the WNW at 19 mph and a 15-second period. Combined energy is still strong at 3183. This is now pushing into the expert-only zone. It’s big, it’s powerful, and the wind is strong. If you’re not confident, give it a miss.

Things drop off pretty quickly after that. From Thursday the 3rd onwards, we’re looking at a long stretch of small, weak, or messy conditions. The swell drops right down, and the wind either stays too strong or swings around. There’s a gap of about a week where the surf is pretty ordinary, with heights below 3 ft and combined energy figures dropping into the double digits or low triple digits. Not much to get excited about.

Then, we start to see a glimmer of hope. On Friday morning, the 11th of September, the swell picks up a bit to 5 ft from the southeast with a 11-second period, and the wind is a light offshore from the WNW at 6 mph. Combined energy is 706. This is looking good, and the conditions should be clean. By Saturday morning, the 12th, it’s even better. The swell is 6 ft from the ESE with a 10-second period, and the wind is completely glassy. That’s a zero wind state, and you can’t ask for much more than that. The combined energy is 761. This is a great window for The Gap, with the swell direction matching the ESE optimum. It’s fairly consistent, but keep in mind the period is around 10 seconds, so it’s not the super long groundswell that can be tricky at a beach break. This spot is sheltered, so it should handle it well.

The following week has a few more moments. Tuesday morning, the 15th, has 5 ft from the ESE with a 10-second period and glassy conditions again. Combined energy is 472. Then Wednesday, the 16th, has a smaller 3 ft south swell but with a very long 16-second period, and light offshore winds. The combined energy for that is 810, which is decent for the size. That long period means it will wrap in nicely, and the light wind will keep it tidy.

So, to sum it up: the best bet is hands down the Wednesday morning of the 2nd of September for the big, clean, expert-level groundswell, and then the window around the 11th and 12th of September for the cleaner, more moderate conditions. The Gap is the only break on the menu here, and it’s the one to focus on.

Rusty out.

Short Range Forecast

Some drizzle, heaviest during Fri morning. Very mild (max 17°C on Thu morning, min 9°C on Tue afternoon). Winds increasing (calm on Tue afternoon, fresh winds from the WNW by Thu morning).

Days 5-7 Weather Summary

Light rain (total 3mm), mostly falling on Mon morning. Very mild (max 16°C on Fri afternoon, min 9°C on Mon morning). Winds increasing (light winds from the WNW on Sat morning, strong winds from the WSW by Mon morning).

Tue
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
4
3
4
3
1
0
0
0
0
0
0
0
1
0
0
0
1
0
0
2
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
13
3
S
13
1.8
S
17
2.5
S
15
2.1
S
13
1.4
S
12
1.1
S
12
0.8
S
11
0.6
S
10
0.5
S
10
0.6
SSW
8
0.4
SSW
8
0.6
SSW
9
0.8
SSW
10
0.5
SSW
10
0.3
SSW
18
0.9
ENE
8
0.8
NE
8
4
SSW
10
4
S
11
Wave Graph
Metric surfscale
Energy kJ
4619
3440
1863
3170
1561
613
333
151
73
45
40
26
64
114
56
62
113
73
2923
4427
Wind (km/h)
10
S
30
WNW
25
WNW
30
WNW
35
WNW
35
WNW
15
NW
20
NW
20
NNW
30
WNW
35
WNW
15
WNW
15
WNW
25
NNW
25
NNW
20
N
20
NW
30
WSW
55
SW
35
SSW
Wind State
cross-on
off
off
off
off
off
cross-off
cross-off
cross-off
off
off
off
off
cross-off
cross-off
cross-off
off
cross-off
cross-off
cross-off
High Tide
8:33PM1.24m
8:53AM1.31m
9:25PM1.28m
9:42AM1.37m
10:15PM1.30m
10:31AM1.42m
11:03PM1.32m
11:23AM1.45m
11:52PM1.32m
12:17PM1.46m
00:45AM1.30m
1:11PM1.46m
1:41AM1.28m
Low Tide
2:54AM0.17m
3:17PM0.12m
3:42AM0.13m
4:10PM0.07m
4:30AM0.08m
5:01PM0.03m
5:19AM0.03m
5:51PM-0.02m
6:07AM-0.01m
6:40PM-0.05m
6:56AM-0.05m
7:30PM-0.06m
clear
clear
clear
part cloud
clear
clear
clear
clear
rain showers
clear
clear
clear
clear
part cloud
cloud
cloud
cloud
light rain
light rain
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:37
6:37
6:35
6:33
6:31
6:30
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:50
5:51
5:52
5:52
5:53
5:54
5:55
 mm
1
3
2
Temp °C
10
11
15
15
13
17
17
15
15
16
12
16
16
12
14
15
14
10
9
9
Feels °C
6
5
9
8
7
14
14
10
11
9
3
12
12
7
9
11
10
4
-2
0
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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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