Surf Forecasts:
Wanjapu surf forecast from 2 Sep 2026:
- Best quality surf: Thursday 3 Sep, 5AM (local time) - 6ft (1.9m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 11PM (local time) - 8ft (2.5m), 17s period, SSW swell with 3,949 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 5AM (local time) - 6ft (1.9m), 16s 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 5AM. The primary swell is predicted to be 1.9m and 16s period with a secondary swell of 0.6m 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 1.4m 5s period and expected on Thursday (Sep 03) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 3rd Sep) | 6ft (1.9m) 16s |
| Best Surf | 5AM (Thu 3rd Sep) | 6ft (1.9m) 16s |
| 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, this is Rusty.
Look, I’m not gonna lie to you, the next couple of weeks at Wanjapu are a bit of a mixed bag. We’ve got a solid run of groundswell coming through, but the wind is going to be a persistent pain in the backside for most of it. It’s not a total washout, but you’ll have to pick your moments.
The swell kicks off straight away on Wednesday the 2nd of September. We’re looking at a solid 7ft SW groundswell with a very long 16-second period. The energy is strong at 2568, but the wind is a cross-on SSE breeze at 12 mph, which will chop it up. The water temp is 80°, which is bang on average for this time of year.
The pattern continues for the rest of the first week and into the second. The swell hangs around in the 5ft to 7ft range, mostly from the SW or SSW, with that long period. But the wind stays stubbornly from the SSE or S, blowing cross-on or cross at 9-12 mph. It’s surfable, but it’s going to be a bit of a battle with the chop. The energy stays moderate to strong, with readings mostly between 800 and 2200, so there’s power in the water, the wind just isn’t doing us any favors.
Look, the real standout... the one that gets me talking is Sunday the 13th of September. That afternoon session is the one to circle on the calendar. We’ve got a 8ft SW groundswell, with a very long 17-second period, and the energy is a serious 3399. But the best part? The wind swings to a light cross-offshore from the SE. The data says "clean". That’s the magic word. For a reef break like this, that’s as good as it gets. The swell is over 8ft, so this is for experts only. The crowd factor is "sometimes", so with conditions that good, you can expect company.
In the week leading up to that, the morning of Thursday the 10th of September offers a slightly better option with lighter cross-shore winds and a 5ft SW swell, but it’s not the same quality as that Sunday stand-out.
After that Sunday high, the swell drops off a touch into the 7ft range for the start of the following week, but the wind goes back to being cross or cross-on. Then on Thursday the 17th of September, we finally get a morning with an offshore SSW wind at 6 mph, but the swell has dropped to 6ft and is a shorter 14-second period. It’s a clean way to end the run, but the energy is weak.
So, the bottom line: don’t get too excited about the first week and a half unless you love choppy, cross-wind conditions. Hold out for that Sunday the 13th. That’s the one.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Wed afternoon, min 23°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Sat afternoon, min 24°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 16 | SSW 16 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 18 | SSW 17 |
Wave Graph | ||||||||||||||||||||
2537 | 1809 | 1664 | 1265 | 924 | 915 | 799 | 419 | 1240 | 1329 | 1427 | 1700 | 2234 | 2300 | 1604 | 1582 | 1370 | 1077 | 1760 | 3814 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-on | cross | cross-off | cross-on | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross |
High Tide | 1:08AM2.92m | 1:33PM2.22m | 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 | ||||||||
Low Tide | 6:54PM0.47m | 7:40AM0.37m | 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 | |||||||
— | — | 6:05 | — | — | 6:05 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 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 | 25 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 24 |
Feels °C | 27 | 26 | 26 | 26 | 27 | 27 | 27 | 26 | 27 | 28 | 26 | 26 | 25 | 25 | 25 | 24 | 25 | 25 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 16 | SSW 16 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 17 |
2537 | 1809 | 1664 | 1265 | 924 | 915 | 799 | 405 | 1240 | 1329 | 1427 | 1700 | 2234 | 2300 | 1604 | 1582 | 1370 | 1077 | 1188 | 3814 | |
Swell 2 Height (m) Direction Period (s) | — | — | W 18 | — | SE 5 | — | SSW 6 | SSW 14 | W 16 | SSW 5 | SW 18 | — | — | — | SW 23 | SSW 22 | SSW 21 | SSW 19 | SSW 18 | — |
— | — | 6 | — | 29 | — | 7 | 419 | 5 | 2 | 154 | — | — | — | 21 | 46 | 286 | 1004 | 1760 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SSW 17 | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | 202 | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SE 4 | SE 5 | SE 4 | SE 4 | SE 5 | SE 4 | SSE 4 | SE 5 | SE 4 | SSE 4 | SSE 4 | — | S 4 | — | — | — | — | — | SSE 8 | SSE 7 |
31 | 32 | 12 | 31 | 72 | 13 | 21 | 38 | 24 | 16 | 11 | — | 14 | — | — | — | — | — | 55 | 97 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 262 | 20 | 119 | 262 | 0 | 265 | 118 | 108 | 116 | 119 | 108 | 313 | 119 | 119 | 119 | 119 | 108 | 118 | 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.











