Surf Forecasts:
Wanjapu surf forecast from 29 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: Wednesday 2 Sep, 5AM (local time) - 7.5ft (2.3m), 17s period, SW swell with 3,016 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 8PM (local time) - 6ft (1.8m), 14s 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 Saturday (Aug 29) at 8PM. The primary swell is predicted to be 1.8m and 14s period with a secondary swell of 0.1m and 22s. Another secondary swell of 0.6m and 5s 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 17s and forecast to arrive on Wednesday (Sep 02) at 5AM. Winds are predicted to be cross-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 Monday (Aug 31) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sat 29th Aug) | 6ft (1.8m) 14s |
| Best Surf | 5AM (Wed 2nd Sep) | 7.5ft (2.3m) 17s |
| Most Powerful | 5AM (Wed 2nd Sep) | 7.5ft (2.3m) 17s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
G'day, I'm Rusty. Let's have a look at what's on the cards for Wanjapu over the next fortnight.
The opening window kicks off Saturday morning the 29th of August, and the good news is there's some serious energy rolling in straight away. A solid SW groundswell is pushing in, and early Saturday the water is dead flat calm—a pure glass off. We're looking at a 7 ft swell with a period of 16 seconds from the SW, which is proper groundswell, and the combined energy is a hefty 2178 (moderate to strong). This is a serious wave for experienced surfers only. That long period will make for clean, well-shaped walls at this reef break, but you'll want your wits about you as it's pushing well over 5 ft and heading toward 8 ft. The water temp is 79°, which is about average for the time of year. Wanjapu is a consistent, exposed reef that works best on a true SW swell like this. Head in early, because by the afternoon the wind switches to a 15 km/h SE cross-shore, which will mess up the surface a bit.
Sunday the 30th sees the swell drop to 5 ft, but the period remains solid at 13 seconds. The morning starts with a 10 km/h SSW onshore wind, which isn't ideal, but the afternoon turns it around. The SE wind at 15 km/h goes cross-offshore, cleaning up the 5 ft SW swell and the energy sits at a solid 1001 (moderate). That makes for a decent, crowd-friendly option for the afternoon session.
Monday the 31st is an absolute standout in the first week. The morning delivers a textbook glass-off—zero wind, flat calm. The swell is 4 ft with a very long period of 19 seconds from the SW, and the energy is still pumping at 1399 (moderate). That long period is perfect for this reef, giving you smooth, powerful lines with plenty of time between sets to paddle back out. It's not huge, so it's accessible to stronger intermediates, but the quality is top-notch. This is the best session on offer.
From Tuesday the 1st of September onwards, the swell stays solid, ranging from 5 ft to 7 ft, with periods between 16 and 18 seconds, but the winds become the main story. For almost every session after Monday, we're battling cross-shore, cross-onshore, or just plain choppy conditions. The energy values are often high—like 4096 on Tuesday afternoon (strong)—but the surface is going to be lumpy and bumpy due to SE and SSE winds blowing 15 to 25 km/h. There's a lot of swell on offer, but the quality is marginal for a paddle surfer. Given the consistent strong cross-shore winds and the beach-and-reef nature of the setup, these days might actually look more interesting for kite surfing than paddle surfing.
There's a gap of several days where the forecast is just marginal. Friday the 4th and Saturday the 5th of September serve up 5 ft to 6 ft SW swells but with choppy, cross-onshore winds that make it hard to get excited about.
The second week sees a bit of a pulse again. Wednesday the 9th of September morning has 4 ft swell but with a very long 18-second period and light onshore wind, which could offer some cleanish waves if you pick your tide. By Thursday the 10th and Friday the 11th, the swell builds back to 6 ft–7 ft from the SW with a 16-second period and moderate cross-shore winds—still not perfect, but the consistent energy (around 1900–2300) means there'll be waves to be had if you're patient and don't mind a bit of chop.
The best bet overall remains Monday morning the 31st of August. Get on it. The glassy conditions and long-period SW groundswell at 4 ft will deliver the cleanest, most enjoyable waves of the entire outlook.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sat afternoon, min 23°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Tue morning, min 23°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||||
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 16 | SW 15 | SW 14 | 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 |
Wave Graph | |||||||||||||||||||||
2158 | 1576 | 1094 | 711 | 690 | 738 | 1044 | 1367 | 2318 | 2994 | 2846 | 2561 | 2716 | 2220 | 1809 | 1552 | 1265 | 924 | 821 | 787 | 792 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | glassy | on | cross-off | cross-off | glassy | cross | cross-off | cross | cross | cross-off | cross-on | cross | cross-off | cross-on | cross | cross-off | cross-on | cross | cross |
High Tide | 10:59AM2.81m | 11:26PM2.76m | 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 | |||||||
Low Tide | 5:16PM0.20m | 5:28AM0.39m | 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 | ||||||||
6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
— | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 27 | 29 | 27 | 28 | 28 | 27 | 29 | 29 | 28 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 27 | 26 | 26 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 14 | 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 |
2158 | 1576 | 1094 | 711 | 690 | 535 | 1044 | 1367 | 2318 | 2994 | 2846 | 2561 | 2716 | 2220 | 1809 | 1552 | 1265 | 924 | 821 | 787 | 792 | |
Swell 2 Height (m) Direction Period (s) | SE 5 | S 26 | SE 6 | SSE 5 | SSW 21 | SW 19 | SW 12 | SSW 12 | SSW 11 | — | SW 19 | SE 6 | — | — | — | W 18 | — | SSE 5 | SSW 6 | SSW 7 | — |
20 | 13 | 28 | 9 | 302 | 738 | 336 | 347 | 160 | — | 1161 | 31 | — | — | — | 6 | — | 23 | 8 | 9 | — | |
Swell 3 Height (m) Direction Period (s) | — | S 26 | SSW 24 | SW 22 | — | SE 5 | — | — | SE 6 | — | — | — | — | — | — | — | — | SSW 7 | — | — | — |
— | 13 | 54 | 121 | — | 14 | — | — | 26 | — | — | — | — | — | — | — | — | 5 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | SE 5 | — | — | SSE 5 | — | SE 5 | SE 5 | SE 6 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | S 4 | SSE 4 | SSE 4 |
— | 26 | — | — | 9 | — | 19 | 36 | 69 | 30 | 89 | 67 | 19 | 58 | 35 | 13 | 49 | 51 | 9 | 24 | 9 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 116 | 0 | 116 | 0 | 0 | 0 | 262 | 2 | 119 | 262 | 0 | 265 | 262 | 0 | 119 | 118 | 0 | 116 | 118 | 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.











