Castlepoint - The Gap Surf Break

Lat Long: 40.91° S 176.22° E

Castlepoint - The Gap Surf Forecast and Surf Report

Issued: 11 pm 19 Aug 2026 (local time)

Forecast update in  hr  min

Today's Castlepoint - The Gap sea temperature is
11.8° C
0.9° 

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 19 Aug 2026:

  • Best quality surf: Friday 21 Aug, 12AM (local time) - 5ft (1.6m), 13s period, S swell with glassy winds.
  • Most powerful swell: Thursday 20 Aug, 6AM (local time) - 8ft (2.5m), 13s period, SSW swell with 2,268 kJ wave energy.
  • Next surfable swell (1★+): Friday 21 Aug, 12AM (local time) - 5ft (1.6m), 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 Friday (Aug 21) at 12AM. The primary swell is predicted to be 1.6m and 13s period with a secondary swell of 0.7m and 16s. 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 2.5m 13s and forecast to arrive on Thursday (Aug 20) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Tuesday (Aug 25) at 3AM.

Wave TypeTime (NZST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Fri 21st Aug)5ft (1.6m) 13s
Best Surf12AM (Fri 21st Aug)5ft (1.6m) 13s
Most Powerful 6AM (Thu 20th Aug)8ft (2.5m) 13s

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


The Lowdown

Alright, it's your local surf reporter Rusty here. Let's have a look at what's coming up for Castlepoint - The Gap. Water temp is sitting at 53°, which is pretty much average for this time of year, so nothing unusual there.

The next couple of days are a bit of a write-off, I won't lie. Wednesday afternoon (19th August) is a no-go with a big 10ft southerly swell and a 16 mph cross-shore wind making things a messy, lumpy cross-chop. The energy is pumping at 4184, but it's just not surfable.

Thursday (20th August) is also a washout. The morning has some cleaner water with a 6ft swell and light cross-off wind, but it's just not shaping up. The afternoon is even worse with poor conditions.

Then we get a quick glimpse of something good. Friday morning (21st August) is the standout. The wind is light out of the north at 3 mph, almost glassy, and it's a clean cross-off. There's a solid 5ft southerly groundswell with a very long 16-second period - that's a lot of energy, but at a beach break, that long period can make it break a bit too straight. Still, the conditions are very good, and the energy is strong (1316). This is a quality window for anyone who knows the break.

Friday afternoon (21st August) stays clean with a 5ft southerly swell and a 13-second period, but the wind is a bit stronger out of the northwest at 9 mph. It's still good.

Saturday (22nd August) sees a drop in size. The morning has a clean 3ft swell with a strong offshore wind, but it's just small. The energy is weak (257). The afternoon is much the same with 3ft. Sunday (23rd August) is tiny and blown out.

Monday morning (24th August) is a decent option. There's a clean 4ft SSW swell with a 12-second period and a moderate offshore breeze. The energy is moderate (430), and conditions are good. This is a solid pick for a session.

From Monday afternoon through the rest of the week, it's a slow grind. The swells are small (3ft to 4ft), mostly from the SSW, with strong offshore winds that are just too much for the size. The water is clean but hard to paddle into. Crowds are often at The Gap, but with these conditions, it won't be an issue.

The end of the month and into September shows a bit of a pulse, but the wind is terrible. The first week of September (1st to 3rd) sees a building south/southwest swell reaching 8ft, but it's all onshore and cross-shore, making for lumpy, choppy, and generally poor surf. The energy on Thursday morning (3rd September) is strong (1294), but with a 16 mph cross-shore, it's a mess.

So, to sum it up: Friday morning (21st August) is the clear winner. It's the best on offer, hands down. Monday morning (24th August) is your backup. After that, it's a long wait for something rideable, but the forecasts can change, so don't lose hope entirely.

Rusty out.

Short Range Forecast

Some drizzle, heaviest during Wed night. Very mild (max 14°C on Sat afternoon, min 9°C on Wed night). Winds increasing (calm on Thu night, strong winds from the WNW by Sat morning).

Days 5-7 Weather Summary

Mostly dry. Very mild (max 16°C on Sun morning, min 9°C on Sun night). Winds increasing (light winds from the NW on Sun night, fresh winds from the WNW by Tue afternoon).

Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
1
1
3
2
1
0
0
0
0
0
0
0
1
3
1
2
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
SSW
14
1.7
S
8
1.9
S
8
1.6
S
13
1.7
S
16
1.5
S
13
1.3
S
12
1.1
S
11
0.9
S
11
0.7
S
10
0.5
S
10
0.3
ESE
13
0.3
ESE
13
0.6
SSW
15
1.9
SSW
15
1.5
SSW
14
1.3
SSW
14
1
SSW
13
0.8
SSW
15
Wave Graph
Metric surfscale
Energy kJ
3069
392
493
839
1384
796
472
300
189
106
48
33
32
169
1459
874
580
372
288
Wind (km/h)
20
SW
20
SW
20
SSW
5
SSW
10
NNE
20
NW
25
NW
35
WNW
35
WNW
35
NW
30
WNW
30
WNW
15
W
20
WNW
25
NW
25
NW
20
NW
35
WNW
40
WNW
Wind State
cross-off
cross-off
cross
glassy
cross
cross-off
cross-off
off
off
off
off
off
off
off
off
cross-off
off
off
off
High Tide
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
2:01PM1.24m
2:24AM1.10m
2:42PM1.22m
Low Tide
4:59AM0.17m
5:31PM0.16m
5:43AM0.20m
6:17PM0.18m
6:24AM0.22m
6:59PM0.20m
7:03AM0.24m
7:40PM0.21m
7:42AM0.24m
8:20PM0.21m
8:22AM0.24m
9:01PM0.22m
light rain
cloud
cloud
cloud
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:58
6:56
6:54
6:54
6:52
6:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:38
5:39
5:40
5:42
5:42
5:43
 mm
1
Temp °C
10
11
10
9
12
13
10
13
14
14
16
15
11
14
14
11
14
14
15
Feels °C
5
6
5
7
9
9
4
5
6
8
11
9
7
9
8
6
7
6
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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