
Surf Forecasts:
Wanjapu surf forecast from 8 Sep 2026:
- Best quality surf: Thursday 10 Sep, 5AM (local time) - 7ft (2.2m), 15s 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★+): Thursday 10 Sep, 5AM (local time) - 7ft (2.2m), 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 Thursday (Sep 10) at 5AM. The primary swell is predicted to be 2.2m and 15s period with a secondary swell of 1.2m and 18s. 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 2.5m 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 8PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 10th Sep) | 7ft (2.2m) 15s |
| Best Surf | 5AM (Thu 10th Sep) | 7ft (2.2m) 15s |
| 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, let’s get into it. There’s a bit of a slow start here, but the second half of this window has some serious potential. We’ve got a long period SW groundswell running the whole time, but the wind and conditions are going to be the deciding factor for a lot of these sessions. Right now, it’s a waiting game for the clean windows to line up with the size.
Right out of the gate, to be honest, the first few days are a bit of a write-off for great waves. Wednesday and Thursday are looking at a bumpy 8ft of SW swell, but that cross-shore wind is going to have it all chopped up. There’s plenty of energy in the water – we're looking at moderate to strong energy readings around 3278 and 2888 – but it’s not going to be pretty. You’d be fighting a cross-chop more than riding a wave. Then Friday rolls in with a bit less size, around 7ft, but that cross-on wind keeps things messy. This is a period for the kites, not the paddles, at Wanjapu (Reef).
Now, hold on, because Saturday the 12th is where it starts to get interesting. Saturday morning the wind drops right out and it goes glassy. The swell settles to a clean 5ft from the SW at 15 seconds. The energy is still solid at 1615, but the surface is going to be like a mirror. That’s your first real window for a proper surf. It’s an advanced wave, so it'll be a bit much for the learners, but for the crew that knows what they’re doing, Saturday morning is pure gold.
Sunday morning is a step back, with the cross-on breeze and a bit of chop on a 6ft SW swell. But don't sleep on Sunday afternoon. The wind swings around to the east, going cross-off, and the swell bumps up to 8ft with a very long 18-second period. The energy jumps to 3145 and it cleans right up. This is another standout session. The long period will have it lining up nicely on the reef.
The following week stays pretty consistent, but nothing quite hits those heights. We go through a run of clean but smaller surf, with most days offering waves in the 6ft range. Monday afternoon and Tuesday morning have their moments, but the light cross-shore winds keep it from being epic. The energy dips a bit too, down into the 1600s and 1700s.
The standouts for this whole period, though, are clear. The first is that glassy Saturday morning, and the second is the bigger, cleaner Sunday afternoon. Both are clean, both have proper SW groundswell, and both have a serious amount of energy behind them. If you can only pick two sessions, those are the ones.
The glassy conditions are back again on Thursday the 17th morning. There’s 7ft of SW swell at 15 seconds and energy around 1846. Another good call, though maybe not quite as clean as the weekend before. After that, we see a little dip in size and energy around the 19th, with waves dropping to 5ft and energy falling under 1000. It’ll be weak and a bit average.
But don’t worry, the models are showing a fresh pulse filling back in for the 22nd and especially the 23rd. By Wednesday the 23rd, we could be looking at 8ft of SSW groundswell with energy jumping back up to 3900. It’s still a week and a half out, so we’re locking it in as promising, but not certain. The wind is a bit dicey though, with some cross-shore energy in the afternoons that could mess it up. Keep an eye on it.
So, get out there this weekend, keep the faith for next week, and I’ll see you in the water.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Fri afternoon, min 24°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 27°C on Sat afternoon, min 24°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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 17 | SSW 16 | SSW 16 | SW 16 | 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 |
Wave Graph | |||||||||||||||||||
2296 | 3278 | 2864 | 2262 | 1261 | 2498 | 2201 | 2066 | 1860 | 1417 | 1020 | 911 | 1491 | 1850 | 3074 | 2344 | 1919 | 1764 | 1654 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | cross | cross | cross-off | cross-on | cross | cross-off | glassy | cross-off | glassy | cross-on | cross-off | cross-off | cross | cross-off | cross-off |
High Tide | 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 | 11:58AM2.73m | 00:04AM3.04m | ||||||
Low Tide | 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 | 5:55AM0.11m | 5:55PM0.30m | |||||||
— | 6:01 | — | — | 6:01 | — | — | 6:00 | — | — | 6:00 | — | — | 5:58 | — | — | 5:58 | — | — | |
6:00 | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — |
Temp °C | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 26 | 28 | 28 | 26 | 28 | 28 | 27 | 28 | 28 | 29 | 29 | 29 | 29 | 30 | 28 | 29 | 28 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 16 | SSW 16 | SW 16 | 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 |
2296 | 3278 | 2864 | 2262 | 1261 | 2498 | 2201 | 2066 | 1860 | 1417 | 1020 | 911 | 1491 | 1850 | 3074 | 2344 | 1919 | 1764 | 1654 | |
Swell 2 Height (m) Direction Period (s) | SSW 12 | — | — | — | SSW 18 | — | SW 27 | SSW 26 | SW 24 | SE 6 | SW 21 | SW 21 | SW 15 | SW 14 | — | SSE 6 | — | — | SSE 6 |
1032 | — | — | — | 1021 | — | 28 | 66 | 90 | 37 | 548 | 647 | 757 | 598 | — | 41 | — | — | 41 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SSW 26 | — | SW 24 | SE 6 | — | SSE 6 | — | — | — | — | — | — |
— | — | — | — | — | — | — | 66 | — | 197 | 16 | — | 49 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | SE 4 | SE 4 | SE 4 | SE 4 | SE 5 | — | SE 5 | — | SE 6 | SE 5 | SE 6 | SSE 6 | SE 5 | SE 6 | SSE 5 | SE 5 | SE 6 |
— | — | 24 | 19 | 14 | 15 | 18 | — | 37 | — | 31 | 27 | 135 | 20 | 71 | 104 | 26 | 57 | 92 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 108 | 118 | 118 | 108 | 119 | 262 | 0 | 118 | 118 | 0 | 0 | 0 | 0 | 116 | 0 | 33 | 119 | 0 | 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.










