
Surf Forecasts:
Wanjapu surf forecast from 16 Sep 2026:
- Best quality surf: Thursday 17 Sep, 2AM (local time) - 6ft (1.9m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 11PM (local time) - 7ft (2.2m), 16s period, SW swell with 2,354 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 2AM (local time) - 6ft (1.9m), 15s period with SW swell.
Best Forecast Surf Conditions for Wanjapu this week:
The surf forecast for Wanjapu over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 17) at 2AM. The primary swell is predicted to be 1.9m and 15s period with a secondary swell of 0.4m and 19s. Another secondary swell of 0.8m and 6s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Wanjapu in the next 16 days are 2.2m 16s and forecast to arrive on Sunday (Sep 20) at 11PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Thursday (Sep 17) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 17th Sep) | 6ft (1.9m) 15s |
| Best Surf | 2AM (Thu 17th Sep) | 6ft (1.9m) 15s |
| Most Powerful | 11PM (Sun 20th Sep) | 7ft (2.2m) 16s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
Alright, this is Rusty coming at you with a look at what’s shaping up for Wanjapu over the next couple of weeks. We’ve got a real mixed bag here, but there are a few moments that’ll get the stoke going.
First things first – the water temp is sitting at 79°F, with a small anomaly of -1°F, so pretty much right where it should be for this time of year. That’s a good start.
Right now, the pattern is a bit frustrating. We’ve got some solid SW groundswell on the cards, but the wind and conditions are making it hard to get excited. That 15-second period on the 16th is a good sign for energy, but the wind is all over the place, and the surf comment keeps saying “marginal” – so don’t expect much.
Now, let’s talk about the best window. Honestly, the standout here is the morning of Saturday the 19th. The swell drops to 4ft from the SW, but the wind goes glassy with a WNW direction. That’s as clean as it gets. The wave energy is moderate, sitting at around 754, but for a reef break with that kind of offshore and glass, the quality will be way above what the size suggests. It’s a great window for a patient surfer who wants smooth lines, not a big drop. Keep in mind, Wanjapu is an advanced reef break, so it’s not for beginners anyway.
After that, the swell builds again, but the wind isn’t kind. Sunday the 20th afternoon sees 7ft from the SW with a clean, cross-off breeze from the ESE – that’s promising, and the energy jumps to 2306 (moderate to strong). If you can get out then, it’ll be worth it.
Looking further out, we’ve got a massive pulse arriving around the 27th and 28th of September. On Sunday the 27th, the swell hits 10ft from the SW with an 18-second period – that’s serious groundswell. The energy reading is huge at 5742 on the morning, so this is powerful stuff. But that size is strictly for experts only; anything over 8ft here is for the big dogs. The morning of Monday the 28th is even more interesting: 8ft, glassy, with a 16-second period. That’s prime for an experienced surfer who wants clean, solid waves without the full-on chaos of the day before. The comment even says “excellent surf conditions for experienced surfers” – that’s your call to action.
After that, the swell slowly fades through the end of the month and into October. The morning of October 1st sees a drop to 4ft, but a clean cross-off wind and a long 20-second period makes for a sneaky good session at a smaller, more manageable size. Energy is still moderate at 1171, and the comment says “excellent surf conditions for experienced surfers.”
So, if you’re asking me: the absolute best on offer is the morning of Monday the 28th of September – glassy, 8ft SW groundswell, and that quality is going to be hard to beat. Saturday the 19th morning is your pick for a smaller, glassy session. Keep the second week in mind for that big event around the 27th-28th, but know that the long-range stuff is a bit less certain.
A word to the wise: Wanjapu can get crowded sometimes, so if the conditions line up, get in early.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Sat afternoon, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | |||||||||||||||
AM | 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) | SW 15 | SW 14 | SW 15 | SSW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 17 |
Wave Graph | |||||||||||||||||||||
1446 | 1307 | 1446 | 1690 | 1533 | 1368 | 1089 | 907 | 661 | 614 | 581 | 609 | 1893 | 2287 | 2325 | 1889 | 1602 | 1115 | 846 | 600 | 885 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | cross-off | on | cross | cross-off | cross | cross | cross-off | glassy | cross | cross-off | on | cross-off | cross-off | cross-on | cross | cross-off | cross-on | cross | cross-off |
High Tide | 12:55PM2.36m | 00:55AM2.80m | 1:22PM2.13m | 1:20AM2.60m | 1:48PM1.89m | 1:46AM2.38m | 2:17PM1.65m | 2:15AM2.15m | 3:29PM1.42m | 3:12AM1.92m | 10:26PM1.63m | 7:03AM1.89m | 9:15PM1.85m | ||||||||
Low Tide | 6:43PM0.58m | 7:26AM0.44m | 7:04PM0.75m | 7:58AM0.66m | 7:23PM0.95m | 8:37AM0.90m | 7:38PM1.15m | 9:42AM1.13m | 7:23PM1.36m | 1:41PM1.16m | 00:30AM1.62m | 2:38PM0.96m | 2:35AM1.38m | ||||||||
5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | |
— | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 5:59 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 |
Feels °C | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 31 | 29 | 29 | 30 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 27 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 15 | SSW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 |
1446 | 1307 | 1446 | 1690 | 1533 | 1368 | 1089 | 907 | 661 | 614 | 581 | 428 | 1893 | 2287 | 2325 | 1889 | 1602 | 1115 | 846 | 600 | 527 | |
Swell 2 Height (m) Direction Period (s) | SSW 21 | SSW 21 | SW 19 | — | — | SE 6 | SW 22 | SW 21 | SE 5 | SW 19 | SW 19 | SW 18 | SE 6 | — | SE 6 | SE 6 | — | SE 6 | SW 20 | SSW 19 | SW 17 |
45 | 45 | 96 | — | — | 25 | 18 | 18 | 7 | 126 | 343 | 609 | 20 | — | 38 | 39 | — | 25 | 98 | 231 | 885 | |
Swell 3 Height (m) Direction Period (s) | W 16 | W 16 | SSW 6 | — | — | — | SW 22 | — | SW 20 | SE 6 | — | SE 6 | — | — | — | — | — | SW 20 | — | — | SE 6 |
5 | 5 | 6 | — | — | — | 18 | — | 61 | 14 | — | 31 | — | — | — | — | — | 15 | — | — | 31 | |
Wind waves Height (m) Direction Period (s) | — | SE 4 | SE 6 | SE 5 | SE 5 | — | — | SE 6 | — | — | SE 6 | — | — | SE 5 | — | — | SE 6 | — | SE 5 | SE 4 | ESE 6 |
— | 40 | 38 | 19 | 47 | — | — | 15 | — | — | 20 | — | — | 19 | — | — | 26 | — | 17 | 16 | 84 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 116 | 262 | 0 | 116 | 118 | 0 | 116 | 108 | 0 | 0 | 108 | 0 | 116 | 2 | 0 | 116 | 118 | 0 | 116 | 262 | 0 |
Best forecast wave conditions in Sumba | |||||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||||
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Information about the Wanjapu Surf forecast
The above surf forecast table for Wanjapu provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Wanjapu can be found by selecting the local surf guide option on the grey menu. Our Wanjapu 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 (Wanjapu) 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 Wanjapu 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.
Wanjapu is 24 km (15 miles) from the city of Adalara. If you plan a holiday in Sumba, look for hotels and other accommodation in Adalara. Adalara has rooms for a wide range of budgets as well as car hire and transport links.










