Surf Forecasts:
Wanjapu surf forecast from 3 Sep 2026:
- Best quality surf: Saturday 5 Sep, 8AM (local time) - 5.5ft (1.7m), 14s period, SSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 11PM (local time) - 8ft (2.5m), 17s period, SSW swell with 3,832 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 11PM (local time) - 5ft (1.5m), 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 03) at 11PM. The primary swell is predicted to be 1.5m and 15s period with a secondary swell of 0.8m and 5s. 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 2.5m 17s and forecast to arrive on Tuesday (Sep 08) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Friday (Sep 04) at 2AM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 3rd Sep) | 5ft (1.5m) 15s |
| Best Surf | 8AM (Sat 5th Sep) | 5.5ft (1.7m) 14s |
| Most Powerful | 11PM (Tue 8th Sep) | 8ft (2.5m) 17s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it.
Well, it’s a bit of a mixed bag on the horizon. We’ve got some solid swell on the way, but the wind is going to be a persistent issue, making it tough to find any clean waves. The first few days are a write-off for any decent surf, with the wind howling out of the south-southeast most of the time, putting a chop on everything. We’re looking at a bit of a wait until we get a window of clean conditions.
We’ve got a long stretch of poor to marginal conditions from Thursday afternoon, September 3rd right through until the end of the second week. The wind is mostly cross or cross-on, and the wave comment is consistently “marginal” or “poor.” The swell sticks around, but it’s just not cooperating with the wind. The standout window is looking like the very end of the forecast.
The pick of the period is shaping up to be Wanjapu on Friday morning, September 18th. The wind is forecast to go glassy, which is a huge deal. You’ll have a solid 6 ft swell from the SSW, with a very long period of 18 seconds. That’s a proper groundswell, and it’s packing a lot of punch. This is a wave that will handle the reef setup perfectly, and the wind will be dead calm. It’s an advanced wave, so it’s not for the faint of heart, but for those who can handle it, the conditions will be absolutely world-class. It’s a long way out, so keep an eye on it, but that’s the one to circle on the calendar.
The water temperature is sitting at 79°F with a very slight anomaly, so it’s pretty much average for this time of year. The crowds are listed as “sometimes,” so don’t be surprised if you’ve got a few others with the same idea, especially on that glassy morning.
Before that, there’s a long stretch of chop. From the 3rd through to the 17th, it’s mostly a battle with the wind. The swell is there, but it’s rarely clean. The best of a bad bunch might be the Saturday afternoon, September 12th, when the wind swings to a cross-off, giving you a clean look at 6 ft of SW swell. It’s a minor win, but it’s something.
For the beginners out there, keep your eyes peeled for the second week. The swell regularly pushes over 5 ft and up to 8 ft, so a lot of these days will be too big for a learner session, especially with the chop.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 26°C on Thu afternoon, min 23°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Sun afternoon, min 23°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Thu 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SW 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1265 | 924 | 915 | 799 | 419 | 1196 | 1329 | 1560 | 1080 | 2699 | 2441 | 1604 | 1582 | 1370 | 1289 | 1652 | 3657 | 2936 | 2359 | 1822 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross |
High Tide | 1:40AM2.79m | 2:11PM1.94m | 2:20AM2.60m | 3:06PM1.65m | 3:17AM2.37m | 5:44PM1.46m | 5:18AM2.18m | 8:33PM1.69m | 7:32AM2.27m | 9:14PM2.00m | 8:45AM2.49m | 9:46PM2.30m | ||||||||
Low Tide | 7:21PM0.65m | 8:23AM0.55m | 7:48PM0.86m | 9:21AM0.78m | 8:20PM1.10m | 11:03AM0.97m | 9:18PM1.37m | 1:39PM0.88m | 1:05AM1.43m | 2:48PM0.65m | 2:41AM1.14m | 3:29PM0.44m | 3:32AM0.82m | |||||||
 |  | | | | | | | |  |  | | | | | | | | | | |
 | — | — | 6:05 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:01 | — | — | 6:01 | — | — |
 | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 25 | 25 | 25 | 25 | 24 | 24 | 25 | 24 |
Feels °C | 27 | 26 | 27 | 27 | 25 | 26 | 27 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 25 | 24 | 24 | 24 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 17 | SSW 16 | SSW 16 | SW 16 |
| kJ | 1265 | 924 | 915 | 799 | 405 | 1196 | 1329 | 1560 | 1080 | 2699 | 2441 | 1604 | 1582 | 1370 | 1289 | 1162 | 3657 | 2936 | 2359 | 1822 |
Swell 2 Height (m) Direction Period (s) | — | SSE 5 | SE 4 | SSW 6 | SSW 14 | W 16 | — | SW 18 | SSW 17 | SSW 16 | — | SW 24 | SW 22 | SSW 20 | SW 19 | SSW 18 | — | SW 24 | SSW 22 | S 8 |
| kJ | — | 24 | 9 | 7 | 419 | 5 | — | 154 | 510 | 1244 | — | 22 | 73 | 275 | 863 | 1652 | — | 22 | 45 | 44 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SSW 17 | — | — | — | — | — | — | — | — | SW 20 | — | — | — | — | — | SW 20 |
| kJ | — | — | — | — | 202 | — | — | — | — | — | — | — | — | 328 | — | — | — | — | — | 309 |
Wind waves Height (m) Direction Period (s) | SE 4 | SE 5 | — | SSE 4 | SSE 5 | SE 4 | SSE 4 | SE 4 | SE 4 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 20 | 53 | — | 17 | 32 | 10 | 11 | 12 | 7 | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 262 | 0 | 119 | 118 | 108 | 116 | 118 | 118 | 118 | 119 | 33 | 119 | 1682 | 119 | 118 | 119 | 119 | 119 | 119 | 119 |
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.
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