
Surf Forecasts:
Wanjapu surf forecast from 15 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 8PM (local time) - 6ft (1.8m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 11PM (local time) - 7ft (2.1m), 16s period, SW swell with 2,203 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 8PM (local time) - 6ft (1.8m), 15s 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 Tuesday (Sep 15) at 8PM. The primary swell is predicted to be 1.8m and 15s period with a secondary swell of 0.9m and 5s. 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 2.1m 16s and forecast to arrive on Sunday (Sep 20) at 11PM. Winds are predicted to be offshore 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+) | 8PM (Tue 15th Sep) | 6ft (1.8m) 15s |
| Best Surf | 8PM (Tue 15th Sep) | 6ft (1.8m) 15s |
| Most Powerful | 11PM (Sun 20th Sep) | 7ft (2.1m) 16s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
IMPERIAL
Alright folks, Rusty here. We’ve got a bit of a mixed bag for the next couple of weeks at Wanjapu. This reef break is a consistent spot and exposed to the southwest swell, so there's almost always something happening, but we’re looking at some early days with average conditions before some real firecrackers roll in later.
The water is sitting at a warm 79°, which is about average for this time of year, nothing too wild there.
The forecast has a little bit of a lull in quality early on. For the first several days, through the 18th of September, we've got some decent sized swell in the water, around 5ft to 7ft from the southwest, but the wind is mostly cross or cross-onshore. That's going to put a bit of a chop on the surface. The energy is there, but the quality just isn’t locking in. It’s surfable, but you'll be working for your keepers.
Keep an eye on the morning of Saturday the 19th. The swell drops a touch to 4ft from the southwest, but the wind goes glassy. For a reef like Wanjapu, that glassy surface is gold, and the 14-second period from the SW will have some push. With no wind, the shape should be clean and fun. It’s not going to be huge, but it’ll be the first real window of clean waves in this run.
The quiet spell will continue through to the 25th with a mix of small to moderate swell and cross-shore winds.
The big news is for the final few days. Starting on the morning of Saturday the 26th of September, the ocean lights up. We’re looking at a serious pulse of groundswell hitting. The period jumps to a very long 23 seconds, and the swell height is 5ft, but the combined energy is massive! By the afternoon, it’s a solid 10ft from the SSW with a period of 20 seconds and even more energy. This is a serious, deep ocean swell. The wind on Saturday afternoon is a gentle cross-shore from the SE, which should keep it fairly clean.
However, this is big. Over 8ft, this is strictly for the experts out there. That long period is going to make for some super clean, powerful lines at this reef, but it will also be challenging. Sunday the 27th keeps the 10ft swell going, again for experienced surfers only. After that, it drops back to a more manageable 5ft to 8ft range for the last couple of days into the end of the month.
The true standout here is the morning of Tuesday the 29th of September. The swell has dropped to a friendly 5ft from the SSW, period at 14 seconds, with glassy, offshore wind. The guidance is calling it “excellent surf conditions for experienced surfers,” and I’m with that. For the advanced crew, this is the session to circle on your calendar. Conditions are perfect. Wanjapu can get a crowd, as it can get “sometimes” busy, but on a Tuesday morning with that kind of perfection, you might just score.
So to wrap it up: The first week is a bit average with chop. The weekend of the 19th has a nice glassy day for smaller waves. The big story is the huge, expert-only swell starting the 26th, but the absolute pick of the whole run is that glassy Tuesday the 29th.
Rusty.
Short Range ForecastSome drizzle, heaviest during Tue night. Warm (max 27°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 24°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
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 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SSW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 |
Wave Graph | |||||||||||||||||||||
1650 | 1581 | 1581 | 1446 | 1307 | 1446 | 1690 | 1533 | 1285 | 990 | 907 | 661 | 676 | 581 | 609 | 1915 | 1968 | 2203 | 1801 | 1521 | 1115 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross-on | cross | cross-off | cross-on | cross | glassy | cross | cross | cross-off | glassy | cross | off | on | cross | cross-off | cross-on | cross | cross |
High Tide | 12:27PM2.57m | 00:30AM2.95m | 12:55PM2.36m | 00:55AM2.80m | 1:22PM2.13m | 1:20AM2.60m | 1:48PM1.89m | 1:46AM2.38m | 2:17PM1.65m | 2:15AM2.15m | 3:29PM1.42m | 3:12AM1.92m | 10:26PM1.63m | ||||||||
Low Tide | 6:19PM0.42m | 6:56AM0.26m | 6:43PM0.58m | 7:26AM0.44m | 7:04PM0.75m | 7:58AM0.66m | 7:23PM0.95m | 8:37AM0.90m | 7:38PM1.15m | 9:42AM1.13m | 7:23PM1.36m | 1:41PM1.16m | 00:30AM1.62m | ||||||||
5:58 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | |
— | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 26 | 26 | 26 | 27 | 25 | 26 | 27 | 26 |
Feels °C | 27 | 27 | 28 | 28 | 27 | 29 | 28 | 28 | 29 | 28 | 30 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 28 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SSW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 |
1650 | 1581 | 1581 | 1446 | 1307 | 1446 | 1690 | 1533 | 1285 | 990 | 907 | 661 | 676 | 581 | 422 | 1915 | 1968 | 2203 | 1801 | 1521 | 1115 | |
Swell 2 Height (m) Direction Period (s) | — | — | SW 24 | SSW 21 | SSW 21 | SE 6 | SE 5 | — | SE 6 | SE 5 | SW 21 | SE 5 | SW 19 | SW 19 | SW 18 | SE 6 | — | SE 6 | SE 5 | — | SE 5 |
— | — | 22 | 45 | 45 | 33 | 22 | — | 26 | 6 | 18 | 4 | 175 | 339 | 609 | 18 | — | 38 | 29 | — | 23 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | W 16 | W 16 | SSW 5 | — | — | — | SW 22 | — | SW 20 | SE 6 | — | SE 6 | — | — | — | — | — | SW 20 |
— | — | — | 5 | 5 | 6 | — | — | — | 18 | — | 61 | 10 | — | 27 | — | — | — | — | — | 16 | |
Wind waves Height (m) Direction Period (s) | SE 4 | SE 5 | SE 5 | SE 4 | SE 5 | SE 6 | — | SE 4 | SE 6 | — | SE 6 | — | — | SE 6 | — | — | SE 5 | — | — | SE 6 | SE 5 |
19 | 56 | 27 | 12 | 56 | 77 | — | 26 | 72 | — | 16 | — | — | 21 | — | — | 34 | — | — | 25 | 67 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 116 | 262 | 0 | 116 | 118 | 0 | 116 | 265 | 0 | 116 | 118 | 0 | 0 | 118 | 0 | 116 | 118 | 0 | 116 | 118 | 20 |
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.










