Surf Forecasts:
Wanjapu surf forecast from 30 Aug 2026:
- Best quality surf: Sunday 30 Aug, 11PM (local time) - 4.5ft (1.4m), 13s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 2PM (local time) - 7.5ft (2.3m), 17s period, SSW swell with 3,057 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 5PM (local time) - 4.5ft (1.4m), 13s 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 Sunday (Aug 30) at 5PM. The primary swell is predicted to be 1.4m and 13s period with a secondary swell of 0.6m and 21s. 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 17s and forecast to arrive on Sunday (Sep 06) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Monday (Aug 31) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sun 30th Aug) | 4.5ft (1.4m) 13s |
| Best Surf | 11PM (Sun 30th Aug) | 4.5ft (1.4m) 13s |
| Most Powerful | 2PM (Sun 6th Sep) | 7.5ft (2.3m) 17s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's talk about what's on the menu at Wanjapu over the next couple of weeks. We've got a solid run of swell, but the wind's gonna be the thing that makes or breaks it, so let's get into it.
Kicking off this Sunday morning, the 30th of August, and it’s a beauty to start. We’ve got a 5ft SW groundswell, a very long 13-second period, and the wind is glassy. The water's sitting at 79°, which is pretty much bang on average for this time of year. The combined energy is moderate at 842, but it'll feel like more with that long period. Get out there early; it'll be clean and fun. The afternoon stays clean with a cross-off ESE breeze, so you could stay out all day.
Monday the 31st is the real standout here. Monday morning is looking pure magic: glassy conditions again, with a 4ft SW swell but the period has jumped to a massive 19 seconds. That is very low-frequency groundswell, packing a punch with an energy reading of 1402. This is the kind of day where you paddle out and the sets just seem to come from another world. It's broken through the "excellent" bracket, so it's one for the experienced crew. Best to grab it now because the afternoon turns to a lumpy cross-shore mess as the wind picks up.
From Tuesday the 1st of September onwards, things get a bit more of a challenge. The swell size pushes up over 7ft, sometimes hitting 8ft, so this is expert territory. But the wind goes mostly cross or cross-onshore, and the wave comment flags it as marginal. The energy readings are huge – we're talking 2994 on Tuesday morning, 4057 Tuesday afternoon, and even hitting 6430 on Sunday the 13th of September – but the wind is just not playing ball. It will be big, powerful, and lined up, but probably a washing machine.
We get a little reprieve on Saturday the 5th of September. The morning has a brief window of offshore wind (SSW at 3 mph) with a 5ft SW swell. It’s only a small window and it comes with a “questionable tide” warning, but if you’re keen on a dawny, it might be worth a look.
Fast forward to Saturday the 12th of September. Morning glass again! A 7ft SW swell with a solid 18-second period and 2744 energy. It’s another one of those special long-period swells that will be holding up beautifully at Wanjapu. Keep in mind though, this is a consistent reef break and the crowds are sometimes an issue, so get in early.
Then we hit Sunday the 13th of September. The swell holds at 8ft from the SW, period of 18 seconds, and the energy is at its peak for the whole run at 6430. The morning wind is straight onshore, which is a shame for such an incredible amount of energy. This one is really for the experts who don't mind a battle.
So, if you want the best, you’re looking at Monday morning the 31st of August and Saturday morning the 12th of September. Both have glassy wind, long-period SW groundswell, and the kind of conditions that make you fall in love with this place. The stuff in between is big but messy.
Stay salty,
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Tue afternoon, min 23°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 13 | SW 13 | SW 19 | SW 19 | 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 13 | SSW 13 | SSW 14 |
Wave Graph | |||||||||||||||||||||
711 | 690 | 738 | 1044 | 1367 | 2174 | 2994 | 2813 | 2726 | 2748 | 2384 | 1809 | 1664 | 1265 | 924 | 736 | 716 | 711 | 867 | 1077 | 1516 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | glassy | glassy | cross | cross-off | cross-on | cross | cross-off | cross-on | cross | cross-off | cross-on | cross | cross-off | cross-on | cross | cross-off | on | cross | cross |
High Tide | 11:29AM2.82m | 11:49PM2.88m | 11:58AM2.77m | 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 | |||||||
Low Tide | 5:40PM0.20m | 5:58AM0.28m | 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 | ||||||||
6:07 | — | — | 6:07 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:03 | — | — | |
— | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 27 | 25 | 25 | 26 | 25 |
Feels °C | 28 | 29 | 26 | 28 | 28 | 27 | 27 | 27 | 27 | 26 | 27 | 26 | 26 | 26 | 26 | 25 | 26 | 25 | 27 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 13 | SW 19 | 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 13 | SSW 13 | SSW 14 |
711 | 690 | 535 | 1044 | 1367 | 2174 | 2994 | 2813 | 2726 | 2748 | 2384 | 1809 | 1664 | 1265 | 924 | 736 | 716 | 711 | 867 | 1077 | 1516 | |
Swell 2 Height (m) Direction Period (s) | SSE 5 | SSW 21 | SW 19 | SW 12 | SW 12 | SW 11 | — | SW 19 | SE 6 | — | — | — | W 18 | — | — | SSW 6 | SSW 7 | SSW 6 | W 16 | W 16 | — |
10 | 302 | 738 | 336 | 278 | 128 | — | 1161 | 31 | — | — | — | 6 | — | — | 4 | 4 | 4 | 5 | 5 | — | |
Swell 3 Height (m) Direction Period (s) | SW 22 | SE 5 | SE 5 | SE 5 | — | SE 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
121 | 7 | 12 | 22 | — | 32 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | SE 6 | — | SE 5 | SE 5 | SE 6 | SE 5 | SE 5 | SE 5 | SE 5 | SE 4 | SE 5 | SE 4 | SSE 4 | SE 5 | SSE 5 | SSE 4 | SE 4 | SSE 4 | SE 4 | — |
— | 24 | — | 57 | 24 | 88 | 30 | 83 | 85 | 22 | 34 | 30 | 16 | 24 | 32 | 12 | 32 | 16 | 7 | 6 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 262 | 0 | 119 | 118 | 0 | 119 | 118 | 0 | 119 | 262 | 0 | 265 | 119 | 33 | 116 | 119 | 108 |
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.











