Surf Forecasts:
Castlepoint - The Gap surf forecast from 15 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 12AM (local time) - 16ft (5.0m), 12s period, S swell with cross-offshore winds.
- Most powerful swell: Wednesday 19 Aug, 12PM (local time) - 16ft (5.0m), 14s period, S swell with 9,181 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 12AM (local time) - 16ft (5.0m), 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 12AM. The primary swell is predicted to be 5.0m and 12s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Castlepoint - The Gap in the next 16 days are 5.0m 14s and forecast to arrive on Wednesday (Aug 19) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Friday (Aug 21) at 9PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 19th Aug) | 16ft (5.0m) 12s |
| Best Surf | 12AM (Wed 19th Aug) | 16ft (5.0m) 12s |
| Most Powerful | 12PM (Wed 19th Aug) | 16ft (5.0m) 14s |
Table - best surf conditions forecast for Castlepoint - The Gap over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what Castlepoint – The Gap has lined up for the next couple of weeks.
The first few days are a total bust. From the 16th through the 19th of August, don't even think about it. The wind is screaming out of the south at 30 to 50 km/h, absolutely ruining the surface. The swell is big, pushing 10ft to 15ft, but it's all short-period mess from the S or SSW. The combined energy is enormous, hitting numbers like 1725 and up to 13713, but it's just raw, ugly power. This is more of a kite-surfing show than a surf break.
Things calm down on Thursday the 20th. The swell settles to a much more manageable 7ft from the south, with a 10-second interval and an energy reading of 735. The wind goes light, giving us clean conditions in the morning. It won't be epic, but it’s a paddle.
Now, for the good stuff. Friday the 21st of August is the one to circle. The morning has a clean 5ft swell from the S with a 12-second period, combined energy of 1133, and a light offshore breeze from the NW. The afternoon steps it up: the swell pushes to 7ft, the period hits a very long 16 seconds, and the energy jumps to 2114. The wind stays light offshore. That long period is prime for a reef setup like The Gap. This is one for the experienced surfers. The water temp is about what you’d expect for this time of year.
Saturday the 22nd keeps the clean, offshore flow from the WNW, but the swell drops to a smaller 4ft. A good day for a fun, cruisy session, but the magic is gone.
From there, it fades into small, ordinary waves through the end of the month. Swell drops under 3ft and energy sinks below 300. Then, looking at the 27th and 28th of August, the forecasts are hinting at another pulse of 10ft to 11ft S swell with clean winds, showing energy of 1965 and 3111. That’s over a week out, so it’s promising but not locked in. If it shows, it’ll be another day for the experienced crew.
So, the plan is simple: sit out the first few, make Friday the 21st your target, and keep your fingers crossed for the 27th and 28th.
- Rusty
Short Range ForecastModerate rain (total 12mm), heaviest on Sun morning. Very mild (max 12°C on Sat night, min 5°C on Mon night). Winds increasing (light winds from the WSW on Sat night, strong winds from the S by Sun morning). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Wed morning. Very mild (max 14°C on Fri afternoon, min 8°C on Thu night). Winds decreasing (strong winds from the SSW on Tue night, calm by Thu night). | ||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | ENE 9 | SSW 8 | S 10 | S 10 | SSE 9 | SSE 9 | SSE 8 | S 9 | S 10 | S 12 | S 12 | S 15 | S 14 | S 10 | S 9 | S 11 | S 12 | S 16 | S 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 299 | 1442 | 2923 | 2090 | 1258 | 811 | 614 | 1405 | 3772 | 7808 | 5308 | 7987 | 2858 | 715 | 568 | 757 | 596 | 2028 | 1033 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross | cross-off | off | cross-off | cross-off |
High Tide | 7:45AM1.32m | 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 | |||||||
Low Tide | 1:39AM0.04m | 1:57PM-0.02m | 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 | |||||||
 |  | | |  | |  | |  | | | | | | | | |  |  | |
 | — | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:56 | — | — |
 | — | — | 5:35 | — | — | 5:36 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — |
mm | 2 | 5 | 2 | 1 | — | — | — | — | 2 | — | 1 | 1 | — | — | — | — | — | — | — |
Temp °C | 12 | 7 | 9 | 9 | 8 | 9 | 7 | 9 | 10 | 9 | 9 | 10 | 10 | 11 | 10 | 9 | 12 | 14 | 11 |
Feels °C | 11 | -3 | -2 | -1 | 0 | 3 | 0 | -1 | 0 | -2 | 1 | 3 | 4 | 7 | 6 | 8 | 9 | 11 | 6 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | ENE 9 | ENE 9 | E 9 | E 10 | SSE 9 | SSE 9 | SE 10 | E 9 | — | — | S 15 | S 14 | S 10 | S 9 | S 11 | S 12 | S 16 | S 14 |
| kJ | 299 | 283 | 98 | 276 | 327 | 811 | 537 | 110 | 43 | — | — | 5726 | 2858 | 715 | 568 | 757 | 596 | 2028 | 1033 |
Swell 2 Height (m) Direction Period (s) | ESE 8 | — | E 9 | SSW 17 | SSW 15 | E 10 | E 10 | E 9 | — | — | — | — | — | SE 11 | ESE 13 | ESE 12 | S 16 | SE 10 | ESE 10 |
| kJ | 94 | — | 73 | 304 | 312 | 347 | 172 | 83 | — | — | — | — | — | 20 | 17 | 15 | 527 | 27 | 21 |
Swell 3 Height (m) Direction Period (s) | SSW 18 | — | SSW 15 | — | — | SSW 15 | SSW 14 | ESE 9 | — | — | — | — | — | — | ESE 13 | ESE 12 | ESE 10 | — | E 16 |
| kJ | 268 | — | 93 | — | — | 284 | 226 | 8 | — | — | — | — | — | — | 17 | 15 | 10 | — | 5 |
Wind waves Height (m) Direction Period (s) | SW 3 | SSW 8 | S 10 | S 10 | SSE 9 | SSW 8 | SSE 8 | S 9 | S 10 | S 12 | S 12 | S 15 | — | — | — | — | NW 3 | ENE 10 | NNW 4 |
| kJ | 3 | 1442 | 2923 | 2090 | 1258 | 243 | 614 | 1405 | 3772 | 7808 | 5308 | 7987 | — | — | — | — | 6 | 59 | 19 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 137 | 316 | 310 | 102 | 102 | 102 | 16 | 102 | 273 | 235 | 244 | 169 | 1 | 0 | 1 | 0 | 0 | 0 | 28 |
Best forecast wave conditions in The Wairarapa | |||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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