Surf Forecasts:
Wanjapu surf forecast from 31 Aug 2026:
- Best quality surf: Wednesday 2 Sep, 5AM (local time) - 7.5ft (2.3m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 1 Sep, 11AM (local time) - 7.5ft (2.3m), 18s period, SW swell with 3,219 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 11PM (local time) - 6ft (1.9m), 18s 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 Monday (Aug 31) at 11PM. The primary swell is predicted to be 1.9m and 18s period with a secondary swell of 0.9m and 11s. Another secondary swell of 0.9m 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 2.3m 18s and forecast to arrive on Tuesday (Sep 01) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Wednesday (Sep 02) at 2AM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Mon 31st Aug) | 6ft (1.9m) 18s |
| Best Surf | 5AM (Wed 2nd Sep) | 7.5ft (2.3m) 17s |
| Most Powerful | 11AM (Tue 1st Sep) | 7.5ft (2.3m) 18s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
G’day, Rusty here. Alright, listen up, we’ve got a solid run of swell on the horizon for Wanjapu, but it’s a bit of a mixed bag with the wind. The standout window is the first morning, Monday the 31st of August, with the rest of the week a bit of a gamble until conditions clean up again later.
The surf kicks off with a beauty on Monday morning. We’re looking at a 4ft SW groundswell, and the period is a very long 19 seconds. That’s proper energy, with a combined swell energy reading of 1393 (moderate), and the water temp is a comfortable 79°, which is about average for the time of year. The wind is glassy from the SSW at 3 mph. That’s dead clean, perfect for the advanced crew that this reef break demands. It’s a consistent spot, too, so expect sets to roll through. Just be aware, crowds are sometimes an issue here.
By Monday afternoon, the wind swings to a cross-shore 9 mph from the SSE, and the swell bumps up to 5ft. The glass is gone, and it becomes marginal. The rest of the week is a bit of a grind. Tuesday the 1st of September shows a 7ft SW swell (18-second period) with a cross-onshore wind, making it choppy. Tuesday afternoon cleans up a bit with a cross-offshore breeze, but the quality is still just okay. Wednesday the 2nd and Thursday the 3rd are similar stories: plenty of swell (8ft and 6ft) but the wind is never quite right, leaving a light chop on the surface.
You hit a bit of a lull from Friday the 4th through the weekend, with smaller swell dropping to 5ft and periods shortening to 14 seconds. The energy drops (combined energy down to 825 on Friday arvo), and the wind stays messy. Not worth getting excited about.
Now, things start looking up again on Tuesday the 9th of September. Wednesday morning the 9th has a 8ft SSW swell with a 16-second period, and while the wind is onshore, the energy is building (combined energy 3744). The real turn comes Wednesday afternoon: the wind shifts to a cross-offshore breeze from the SE at 9 mph, and you’ve got a 8ft SSW swell running. That’s clean, powerful surf. The combined energy is 3404 (strong). This is the second standout of the forecast.
Thursday the 10th of September also has decent potential in the afternoon with a clean cross-offshore wind again, with a 7ft SSW swell. After that, the second week settles into a pattern of consistent 5ft to 8ft SW swells, but mostly with cross or cross-onshore winds, so it’ll be a matter of picking the morning windows when the breeze is lighter. The best of the later week is probably Tuesday the 15th of September morning, with a 7ft SW swell (16-second period) and light cross-onshore winds, but it’s a long way out. For now, lock in that Monday morning glass-off and the Wednesday the 9th arvo session.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Warm (max 26°C on Thu afternoon, min 23°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | ||||||||||||||
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 18 | SW 18 | SW 18 | SW 17 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 14 | SSW 16 | SSW 14 | SSW 14 | SSW 17 | SSW 16 |
Wave Graph | ||||||||||||||||||||
1367 | 2318 | 3219 | 2846 | 2726 | 2913 | 2384 | 1809 | 1694 | 1265 | 924 | 915 | 799 | 488 | 1179 | 1832 | 1447 | 1463 | 3022 | 2550 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross | cross-off | cross-off | cross-on | cross | cross-off | cross-on | cross | cross-off | cross-on | cross | cross-off | cross-on | cross | cross | cross | cross | cross |
High Tide | 00:13AM2.96m | 12:28PM2.65m | 00:39AM2.97m | 12:59PM2.46m | 1:08AM2.92m | 1:33PM2.22m | 1:40AM2.79m | 2:11PM1.94m | 2:20AM2.60m | 3:06PM1.65m | 3:17AM2.37m | 5:44PM1.46m | ||||||||
Low Tide | 6:04PM0.24m | 6:30AM0.24m | 6:29PM0.34m | 7:03AM0.26m | 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 | |||||||
— | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:03 | — | — | 6:03 | — | — | |
6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — |
Temp °C | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 28 | 26 | 27 | 26 | 26 | 27 | 27 | 26 | 28 | 26 | 26 | 25 | 25 | 25 | 27 | 28 | 26 | 26 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 14 | SSW 16 | SSW 14 | SSW 14 | SSW 17 | SSW 16 |
1367 | 2318 | 3219 | 2846 | 2726 | 2913 | 2384 | 1809 | 1694 | 1265 | 924 | 915 | 799 | 488 | 1179 | 1832 | 1447 | 1463 | 3022 | 2550 | |
Swell 2 Height (m) Direction Period (s) | SW 12 | SW 11 | — | SW 19 | SE 5 | — | — | — | W 18 | — | SE 5 | — | SSW 6 | SSW 14 | W 16 | — | SW 18 | SSW 18 | SSW 13 | — |
278 | 128 | — | 1161 | 30 | — | — | — | 6 | — | 28 | — | 4 | 268 | 5 | — | 155 | 503 | 769 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 17 | — | — | SSW 21 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | 202 | — | — | 45 | — | — | — | |
Wind waves Height (m) Direction Period (s) | SSE 5 | SE 6 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SSE 4 | SE 5 | SE 4 | — | SE 4 | — | — | — |
18 | 36 | 40 | 77 | 62 | 17 | 35 | 30 | 25 | 61 | 62 | 13 | 20 | 30 | 5 | — | 12 | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 262 | 0 | 119 | 118 | 0 | 119 | 118 | 20 | 119 | 262 | 0 | 116 | 118 | 33 | 116 | 118 | 108 | 116 | 118 |
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.











