
Surf Forecasts:
Wanjapu surf forecast from 7 Sep 2026:
- Best quality surf: Sunday 13 Sep, 5PM (local time) - 7.5ft (2.3m), 18s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 5AM (local time) - 8ft (2.5m), 16s period, SSW swell with 3,823 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 5AM (local time) - 6ft (1.9m), 13s period with SSW 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 Tuesday (Sep 08) at 5AM. The primary swell is predicted to be 1.9m and 13s period with a secondary swell of 0.8m 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 2.5m 16s and forecast to arrive on Wednesday (Sep 09) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Saturday (Sep 12) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Tue 8th Sep) | 6ft (1.9m) 13s |
| Best Surf | 5PM (Sun 13th Sep) | 7.5ft (2.3m) 18s |
| Most Powerful | 5AM (Wed 9th Sep) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on offer at Wanjapu for the next couple of weeks.
Right off the bat, we’re looking at a solid, consistent run of SW groundswell pushing into this exposed reef set-up. The water temp is sitting pretty average for this time of year, nothing out of the ordinary. The first half of the week is a bit of a mixed bag, but hang in there because the waves are definitely there, it’s just the wind that’s the main character for a while.
Tuesday the 8th kicks things off with a clean 7ft SSW swell, but a light cross-onshore breeze puts a bit of a ripple on the face. The afternoon sees the size drop a touch to 5ft but the wind picks up, making it choppy. Not the best, but the swell energy is impressive at (2993).
Wednesday the 9th is a step up in size with an 8ft SSW swell, but it’s a bit messed up by a cross-shore breeze. The period is a solid 16 seconds, so there’s proper power in the water (3278), but the wind is keeping it from being clean. The afternoon is similar with a 8ft SSW swell.
Thursday the 10th and Friday the 11th mornings are still in that “marginal” zone with light cross-onshore winds, but the swell is holding around 6ft to 7ft. You’ll find some waves, but they’ll be a bit crumbly.
Now, the real standout starts to show itself on Friday the 11th afternoon. The wind swings to a cross-off from the ESE, the swell is a steady 7ft from the SW with a 15-second period, and the energy is still pumping at (2018). The conditions clean right up. This is when it starts getting good.
Saturday the 12th afternoon is another beauty. A light offshore breeze from the east, 5ft SW swell, and the wave energy is moderate (1684). It’s clean, it’s fun, and the sets will have some shape.
But the best of the whole run? That’s Sunday the 13th afternoon. The stars align. A 8ft SW swell with an 18-second period – that’s a proper long-period groundswell pushing through (3341). This is a reef break, so it will handle that long period beautifully, lining up for some excellent, drop-in waves. The wind is a gentle cross-off from the ESE, keeping the surface clean. This is the pick of the forecast. It’s a solid, experienced surfer’s wave at that size, so leave the foamies at home.
Monday the 14th afternoon cleans up again with a cross-off breeze and 7ft SW swell, but Tuesday the 15th morning looks magic. The wind goes glassy, the swell is a clean 6ft from the SW, and the energy is still strong (1625). It’s a glassy morning session that’s hard to beat.
The second week gets a bit more patchy. The swell is still pumping through, but the wind is a bit more inconsistent. The next real highlight is Friday the 18th morning. It’s dead glassy again, with a 5ft SSW swell. The period is a shorter 13 seconds, so it’s a fun, mellow size for a morning cruise.
Overall, the go-to is Sunday the 13th afternoon for the biggest, cleanest, and most powerful waves. The second best is the glassy morning on Tuesday the 15th, and that Friday the 18th glass-off is a solid option for a smaller, clean session. Crowds are *sometimes* a thing here, but on a weekday, especially the Sunday afternoon, you might get a few locals out, but it’s worth it for the quality.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Sun afternoon. Warm (max 27°C on Fri afternoon, min 25°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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) | SSW 14 | SSW 13 | SW 18 | SSW 17 | SSW 16 | SSW 16 | SW 16 | SSW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 20 | SW 18 | SW 18 | SW 16 |
Wave Graph | |||||||||||||||||||
1272 | 1309 | 1588 | 2296 | 3278 | 2864 | 2262 | 1142 | 2529 | 2201 | 1909 | 1860 | 1417 | 1124 | 1006 | 1491 | 1850 | 3273 | 2475 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | cross | cross | cross | cross-off | cross-on | cross | cross-off | cross | cross-off | cross-off | cross-on | cross-off | cross-off | cross-on | cross-off | cross-off |
High Tide | 8:33PM1.69m | 7:32AM2.27m | 9:14PM2.00m | 8:45AM2.49m | 9:46PM2.30m | 9:35AM2.69m | 10:15PM2.59m | 10:16AM2.82m | 10:43PM2.82m | 10:53AM2.87m | 11:11PM2.98m | 11:26AM2.84m | 11:38PM3.05m | ||||||
Low Tide | 1:05AM1.43m | 2:48PM0.65m | 2:41AM1.14m | 3:29PM0.44m | 3:32AM0.82m | 4:03PM0.29m | 4:13AM0.52m | 4:34PM0.21m | 4:49AM0.30m | 5:02PM0.18m | 5:23AM0.16m | 5:29PM0.22m | |||||||
— | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:00 | — | — | 6:00 | — | — | 5:58 | — | — | |
6:00 | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — |
Temp °C | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 26 | 28 | 27 | 26 | 28 | 28 | 26 | 28 | 29 | 27 | 28 | 28 | 29 | 28 | 28 | 29 | 29 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 13 | SSW 13 | SSW 17 | SSW 16 | SSW 16 | SW 16 | SSW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SW 18 | SW 18 | SW 16 |
1272 | 1309 | 1405 | 2296 | 3278 | 2864 | 2262 | 1142 | 2529 | 2201 | 1909 | 1860 | 1417 | 1124 | 1006 | 844 | 1850 | 3273 | 2475 | |
Swell 2 Height (m) Direction Period (s) | SW 20 | SSW 19 | SW 18 | SSW 12 | — | — | — | SSW 18 | — | SW 27 | SSW 26 | SW 24 | SE 6 | SW 21 | SW 21 | SW 20 | SW 14 | — | — |
338 | 1004 | 1588 | 1032 | — | — | — | 1021 | — | 28 | 66 | 90 | 33 | 548 | 647 | 1491 | 763 | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 24 | — | — | SSE 6 | SE 5 | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | 197 | — | — | 44 | 28 | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | SE 4 | — | SE 4 | SE 5 | SSE 5 | SE 5 | SE 6 | SSE 5 | SE 5 | SE 6 | — | SE 5 | SE 6 |
— | — | — | — | — | — | 14 | — | 10 | 35 | 14 | 68 | 72 | 10 | 31 | 118 | — | 68 | 46 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 118 | 118 | 108 | 118 | 118 | 108 | 116 | 118 | 108 | 118 | 0 | 0 | 116 | 0 | 0 | 265 | 0 | 2 |
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.










