
Surf Forecasts:
Wanjapu surf forecast from 10 Sep 2026:
- Best quality surf: Sunday 13 Sep, 8PM (local time) - 7.5ft (2.3m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 13 Sep, 5PM (local time) - 7.5ft (2.3m), 18s period, SW swell with 3,074 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 2AM (local time) - 7ft (2.1m), 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 Friday (Sep 11) at 2AM. The primary swell is predicted to be 2.1m and 16s period with a secondary swell of 0.1m and 27s. Another secondary swell of 0.6m and 4s 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 Sunday (Sep 13) at 5PM. 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 Wednesday (Sep 16) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Fri 11th Sep) | 7ft (2.1m) 16s |
| Best Surf | 8PM (Sun 13th Sep) | 7.5ft (2.3m) 17s |
| Most Powerful | 5PM (Sun 13th Sep) | 7.5ft (2.3m) 18s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's get into it. We've got a solid run of south-west swell lining up for Wanjapu over the next couple of weeks. The water temp is sitting at 80°, which is pretty much what you'd expect for this time of year.
First up, Thursday the 10th. It's a bit messy to start. We've got a 6ft SSW swell pushing through with a 14-second period, but that SSE wind is making things choppy. The combined energy is strong at 2282, but the conditions are just not cooperating. Don't get too excited for the afternoon either, it gets worse with a 7ft SW swell and a strong cross-shore wind.
Friday the 11th is where it starts to turn. The morning still has a bit of a cross-on breeze on that 7ft SW swell (1984 energy), but by the afternoon, things clean up nicely. The wind goes light and cross-offshore, the 7ft SW swell has a solid 15-second period, and the energy is still pumping at 1978. This is a good window for experienced surfers.
Now, Saturday the 12th morning is the standout of the whole forecast. Glassy conditions, mate. Absolutely still. A clean 5ft SW groundswell rolling in at 15 seconds. The energy is moderate at 1584, but the lack of wind makes it pure. This is the session to point the car towards Wanjapu for. The afternoon gets a bit of a cross-shore ripple, but the morning is golden.
Sunday the 13th sees a big pulse of energy with a 8ft SW swell and an 18-second period. That's a very long period groundswell. The energy jumps right up to 3124 in the afternoon. It's going to be powerful and clean with a light cross-shore breeze, but that size and period mean it's strictly for the experienced crew. It'll be a freight train out there.
Monday the 14th and Tuesday the 15th offer more solid 6ft to 7ft SW swell, but the winds are a bit mixed. Tuesday morning has a clean offshore wind on a 6ft SW swell, but the conditions are listed as unknown, so it's a bit of a gamble.
Into the second week, things get a bit more standard. Wednesday the 16th is average. Thursday the 17th morning has another glassy spell with a 7ft SW swell (1659 energy) – a solid runner-up to that Saturday morning. Friday the 18th drops off a bit in size, down to 4ft.
The weekend of the 20th and 21st brings back some size with 7ft to 7ft SW swell, but the winds are generally cross or cross-on, keeping the quality in the "marginal" category. Tuesday the 22nd and Wednesday the 23rd see another bump in energy (2691 on Wednesday morning), but the wind picks up, making for choppy afternoons. The final days, Thursday the 24th and Friday the 25th, hold size but the wind stays a problem.
Best Bet: No doubt, Saturday 12th September morning. Glassy, clean, and a nice 5ft SW groundswell.
Second Pick: Friday 11th September afternoon for the clean cross-offshore winds on a solid 7ft swell.
For the brave: Sunday 13th September afternoon for the biggest, most powerful 8ft, 18-second groundswell. Not for the faint-hearted.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Sat afternoon, min 24°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Sun afternoon, min 24°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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) | SSW 14 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 20 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 15 | SW 15 | SW 15 |
Wave Graph | |||||||||||||||||||||
1261 | 2498 | 2201 | 1909 | 1860 | 1417 | 1020 | 1006 | 1491 | 1850 | 3074 | 2344 | 2212 | 1742 | 1654 | 1650 | 1694 | 1602 | 1325 | 1446 | 1695 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | cross-on | cross-off | cross-off | glassy | cross | cross-off | cross-on | cross | cross-off | cross | cross | cross-off | on | cross | cross-off | cross | cross | cross-off |
High Tide | 9:35AM2.69m | 10:15PM2.59m | 10:16AM2.82m | 10:43PM2.82m | 10:53AM2.87m | 11:11PM2.98m | 11:26AM2.84m | 11:38PM3.05m | 11:58AM2.73m | 00:04AM3.04m | 12:27PM2.57m | 00:30AM2.95m | 12:55PM2.36m | 00:55AM2.80m | |||||||
Low Tide | 4:03PM0.29m | 4:13AM0.52m | 4:34PM0.21m | 4:49AM0.30m | 5:02PM0.18m | 5:23AM0.16m | 5:29PM0.22m | 5:55AM0.11m | 5:55PM0.30m | 6:26AM0.14m | 6:19PM0.42m | 6:56AM0.26m | 6:43PM0.58m | ||||||||
6:01 | — | — | 6:00 | — | — | 6:00 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:56 | — | — | |
— | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 26 | 26 | 26 | 27 | 26 |
Feels °C | 27 | 27 | 26 | 29 | 28 | 30 | 29 | 30 | 29 | 28 | 29 | 28 | 28 | 29 | 29 | 29 | 28 | 28 | 29 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 15 | SW 15 | SW 15 |
1261 | 2498 | 2201 | 1909 | 1860 | 1417 | 1020 | 1006 | 844 | 1850 | 3074 | 2344 | 2212 | 1742 | 1654 | 1650 | 1694 | 1602 | 1325 | 1446 | 1695 | |
Swell 2 Height (m) Direction Period (s) | SSW 18 | — | SW 27 | SSW 26 | SW 24 | SE 6 | SW 21 | SW 21 | SW 20 | SW 14 | — | — | — | — | SSE 5 | SE 5 | S 5 | SE 6 | SSE 5 | W 16 | SSE 6 |
1021 | — | 28 | 66 | 90 | 28 | 548 | 647 | 1491 | 763 | — | — | — | — | 26 | 11 | 9 | 20 | 15 | 5 | 46 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SW 24 | SE 6 | — | SE 6 | — | — | — | — | — | — | S 6 | — | SSW 5 | SSW 21 | W 16 | — |
— | — | — | — | — | 197 | 16 | — | 37 | — | — | — | — | — | — | 5 | — | 8 | 45 | 5 | — | |
Wind waves Height (m) Direction Period (s) | — | SSE 4 | SE 4 | SSE 5 | SE 5 | — | — | SSE 6 | SE 6 | SE 6 | SE 5 | SE 6 | SE 5 | SE 5 | SE 5 | — | ESE 5 | SE 6 | — | SSE 5 | SE 6 |
— | 19 | 16 | 9 | 28 | — | — | 25 | 86 | 54 | 50 | 50 | 34 | 35 | 65 | — | 16 | 69 | — | 23 | 102 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 116 | 118 | 0 | 2 | 0 | 0 | 0 | 118 | 0 | 116 | 262 | 33 | 119 | 262 | 0 | 116 | 118 | 0 | 116 | 108 | 0 |
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.










