Surf Forecasts:
Castlepoint - The Gap surf forecast from 16 Sep 2026:
- Best quality surf: Monday 21 Sep, 9AM (local time) - 13ft (4.0m), 11s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 21 Sep, 9AM (local time) - 13ft (4.0m), 11s period, SSW swell with 4,375 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 6AM (local time) - 2ft (0.6m), 10s period with SE 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 Thursday (Sep 17) at 6AM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.2m and 14s. 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 4.0m 11s and forecast to arrive on Monday (Sep 21) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 6s period and expected on Sunday (Sep 20) at 9AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 17th Sep) | 2ft (0.6m) 10s |
| Best Surf | 9AM (Mon 21st Sep) | 13ft (4.0m) 11s |
| Most Powerful | 9AM (Mon 21st Sep) | 13ft (4.0m) 11s |
Table - best surf conditions forecast for Castlepoint - The Gap over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m looking at the coming weeks for Castlepoint - The Gap.
Alright, let’s be straight with each other. The start of this outlook is pretty quiet. We’ve got a few days with only tiny, weak waves and messy conditions, so you might want to save your energy. The first real glimmer of hope shows up on Saturday the 19th.
The morning of Saturday the 19th is where things start to get interesting. We’ve got a 3ft swell from the SSW, but get this: a period of 16 seconds. That is a proper, long-period groundswell. The wind is light and offshore from the W, which is going to keep things clean. There’s some real energy behind it. This is a standout session at The Gap. That afternoon, the swell holds at 4ft from the SSW, with a still-good 15-second period and a moderate offshore from the WNW. It’s still clean and fun. The water temperature is sitting at 54°, which is pretty much normal for the time of year, so you won’t need a crazy thick suit just yet.
Sunday the 20th is a total write-off. A strong Southerly breeze is going to make a mess of things, with some rain and all sorts of chop.
Now, hold onto your board. Monday the 21st is the true standout. The morning delivers a 13ft swell from the SSW. That’s big, powerful stuff. A wave of this size is definitely for experienced surfers only. The wind is a gentle offshore from the WSW, and it’s clean. This is excellent surf, but you need to know what you’re doing. The afternoon eases to a still very solid 8ft from the S, with a moderate offshore from the NW.
Tuesday the 22nd and Wednesday the 23rd look pretty poor again, with onshore winds and lumpy conditions. Thursday the 24th brings another big, stormy-looking 8ft SSW swell, but it’s accompanied by a strong cross-shore wind, making it a messy proposition. For most, that will look better for kites than paddle surfing.
We get a brief window on the morning of Friday the 25th with some decent 5ft S swell and clean conditions, but it’s just one session before the wind picks up again.
The last real highlight is way out there, on Monday the 28th of September. Yes, that’s over a week away, so treat it as promising but not locked in. The morning shows a clean 8ft swell from the S, with a 13-second period and glassy conditions. For those who can handle it, that is excellent, powerful surf.
Overall, the best bets are Saturday the 19th for a fun, clean day, and Monday the 21st for a big, challenging session, with that Monday the 28th as a long-range target.
Rusty out.
Short Range ForecastLight rain (total 9mm), mostly falling on Fri night. Very mild (max 16°C on Wed afternoon, min 8°C on Fri night). Winds increasing (light winds from the SSW on Thu night, fresh winds from the SSW by Fri night). | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Sun morning. Very mild (max 14°C on Sat afternoon, min 8°C on Sun morning). Winds decreasing (strong winds from the SSW on Sun morning, calm by Mon morning). | |||||||||||||||||||
Wed 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | ||||||||||||||
PM | 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) | SE 11 | SE 10 | SE 10 | ESE 10 | ESE 14 | ESE 12 | SE 12 | SE 12 | SSW 16 | SSW 15 | SSW 13 | SE 11 | SSW 9 | S 11 | SSW 11 | S 10 | SSW 9 | SSE 8 | S 7 | S 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 34 | 59 | 82 | 63 | 76 | 255 | 220 | 195 | 582 | 543 | 238 | 58 | 1644 | 3876 | 4375 | 1119 | 222 | 93 | 262 | 318 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross-off | cross | cross-off | on | cross | off | off | off | cross | cross | cross-off | cross-off | off | off | cross-off | cross | off |
High Tide | 9:26PM1.27m | 9:46AM1.32m | 10:12PM1.25m | 10:31AM1.30m | 10:54PM1.23m | 11:15AM1.27m | 11:35PM1.19m | 11:58AM1.24m | 00:15AM1.15m | 12:40PM1.22m | 00:57AM1.12m | 1:21PM1.21m | 1:41AM1.10m | |||||||
Low Tide | 3:25PM0.16m | 3:37AM0.22m | 4:14PM0.18m | 4:23AM0.23m | 5:00PM0.19m | 5:06AM0.23m | 5:43PM0.18m | 5:46AM0.23m | 6:22PM0.17m | 6:24AM0.22m | 7:01PM0.16m | 7:01AM0.21m | 7:38PM0.17m | |||||||
 |  |  |  |  | |  |  | | |  |  | | | | | | | | | |
 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:05 | — | — |
 | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — |
mm | — | — | — | — | 1 | — | 2 | 6 | — | — | — | 7 | — | — | — | — | — | 2 | 1 | — |
Temp °C | 16 | 13 | 15 | 16 | 13 | 12 | 11 | 11 | 13 | 14 | 14 | 11 | 11 | 9 | 13 | 14 | 12 | 13 | 9 | 8 |
Feels °C | 11 | 8 | 12 | 13 | 11 | 10 | 10 | 5 | 10 | 9 | 7 | 2 | 1 | 0 | 11 | 10 | 6 | 8 | 3 | 5 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 10 | SE 10 | ESE 10 | SE 9 | ESE 12 | SE 12 | SE 12 | SE 6 | SE 7 | SSW 13 | SE 11 | SE 11 | ESE 11 | S 11 | S 10 | SSW 9 | SSE 8 | SE 12 | S 8 |
| kJ | 34 | 59 | 82 | 63 | 42 | 255 | 220 | 195 | 149 | 152 | 238 | 58 | 29 | 38 | 2626 | 1119 | 222 | 93 | 37 | 318 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 12 | SSW 15 | SSW 14 | ESE 14 | SSW 7 | S 6 | NE 8 | SSW 16 | SSW 15 | SE 7 | ENE 9 | ENE 10 | — | SSW 18 | SSW 18 | SSE 7 | SSW 8 | S 18 | SSW 16 |
| kJ | 32 | 34 | 44 | 37 | 76 | 36 | 30 | 28 | 582 | 543 | 56 | 30 | 18 | — | 114 | 64 | 86 | 62 | 25 | 91 |
Swell 3 Height (m) Direction Period (s) | S 8 | SSW 14 | S 8 | NE 12 | SSW 14 | ENE 6 | NE 7 | SSW 15 | SE 12 | SE 11 | ESE 11 | SE 7 | — | — | — | ESE 10 | SE 10 | SE 10 | — | SE 12 |
| kJ | 12 | 18 | 1 | 5 | 41 | 13 | 21 | 130 | 137 | 126 | 82 | 12 | — | — | — | 20 | 35 | 24 | — | 34 |
Wind waves Height (m) Direction Period (s) | NW 3 | NW 3 | NW 3 | NNE 3 | SSW 2 | — | — | SSE 6 | — | — | WNW 3 | SSW 6 | SSW 9 | S 11 | SSW 11 | — | WNW 4 | — | S 7 | — |
| kJ | 3 | 2 | 2 | 2 | 1 | — | — | 131 | — | — | 9 | 265 | 1644 | 3876 | 4375 | — | 8 | — | 262 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1 | 25 | 0 | 0 | 1 | 0 | 55 | 102 | 0 | 0 | 135 | 235 | 335 | 102 | 0 | 0 | 16 | 1 | 1 | 0 |
Best forecast wave conditions in The Wairarapa | ||||||||||||||||||||
Best forecast wave conditions in New Zealand | ||||||||||||||||||||
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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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