
Surf Forecasts:
Wanjapu surf forecast from 12 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: Sunday 13 Sep, 5PM (local time) - 7.5ft (2.3m), 18s period, SW swell with 3,074 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 8PM (local time) - 4.5ft (1.4m), 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 (Sep 12) at 8PM. The primary swell is predicted to be 1.4m and 14s 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 2.3m 18s and forecast to arrive on Sunday (Sep 13) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Monday (Sep 14) at 8PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sat 12th Sep) | 4.5ft (1.4m) 14s |
| Best Surf | 5PM (Sun 13th Sep) | 7.5ft (2.3m) 18s |
| 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
G’day, I’m Rusty. Let’s have a look at what’s on the table for Wanjapu over the next couple of weeks. This is a solid reef break, an advanced wave, and it’s exposed to a southwest direction, which is exactly where the swell wants to come from. The water temp is sitting at 79.5°F which is pretty much normal for this time of year, so no surprises there—just nice warm water.
The next few mornings and afternoons start off with a bit of a mixed bag. Saturday the 12th shows a 5.2ft SW swell, but the wind is a light cross breeze and the energy is already cooking with a combined 1668 reading—moderate to strong energy. It’s very surfable but the conditions are described as marginal, probably due to tide. So it’s not a total write-off but not the standout.
Now, Sunday the 13th is the real moment to circle. Morning brings in a 5.6ft SW groundswell with an 18-second period—that’s proper long-period energy, and the wind is glassy, mate. It’s crystal clean. The combined energy jumps to 2613, solid and powerful. This is excellent for those who know how to handle a reef. Experienced surfers will be rewarded. The afternoon gets even bigger at 7.5ft, still that long 18-second period, and it turns cross-off with light breeze. Perfect. That afternoon session on the 13th is easily your best bet early on—big, clean, and that deep SW pulse.
Monday the 14th drops a little, 6.9ft and 6.2ft, but still decent. The wind stays light cross-shore, but the wave comment says marginal tide conditions, so you’ll need to pick your time. Tuesday the 15th is similar, with a bit more cross-chop in the afternoon. Wednesday the 16th afternoon sees a return to clean conditions with cross-off winds and 5.9ft from the SW. A solid option if you missed Sunday.
From the 18th onwards, the swell starts to drop—4.6ft to 5.2ft, energy falling to under 1000—so things go quiet for a few days. But hold on, because Sunday the 20th kicks back up with a 5.9ft SW pulse and 17-second period, energy back over 1700. It’s a bit cross-on in the morning, but the afternoon is cross-shore. Still, the real return to form is Monday the 21st morning: glassy conditions, 6.2ft SW, clean as a whistle. Another beauty for those in the know.
The 22nd brings a shift in direction—SSW, with a 3.6ft swell but a very long 19-second period. That’s a long-period groundswell and it’s glassy again in the morning. A sneaky good session for the experts on a low tide? Could be special.
Then we start building toward the end of the period. The 25th has a 6.9ft SSW swell and combined energy of 3098 in the morning—strong stuff. The 26th morning goes huge: 9.8ft SSW with an 18-second period and energy of 5290. That is seriously strong. Over 8ft means it’s expert territory only. The wind is light cross-on, so it might be a little lumpy, but for chargers, that’s a proper big-wave reef day. The 27th morning cleans up nicely with cross-off winds and a still-solid 7.2ft SSW. A fantastic end to the run.
Crowds at Wanjapu are listed as “sometimes.” This is a consistent, exposed reef—when it’s on, you won’t be totally alone, but it’s no circus.
The standout without a doubt is Sunday the 13th: that 5.6ft morning glass and the 7.5ft afternoon with cross-off winds is the pick of the first week. For the second week, Monday the 21st glassy morning and the big 9.8ft on Saturday the 26th are the ones to watch—but that 26th is for experts only, and long-range, so keep an eye on it.
There’s no real gap with no surf here—waves are around most days, just varying in quality. The swell runs strong and consistent for an exposed SW reef.
Stay safe out there.
Short Range ForecastMostly dry. Warm (max 26°C on Sat afternoon, min 24°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
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 14 | SW 20 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 |
Wave Graph | ||||||||||||||||||||
1006 | 1491 | 1850 | 3074 | 2344 | 2212 | 1742 | 1654 | 1650 | 1581 | 1581 | 1446 | 1307 | 1446 | 1554 | 1533 | 1285 | 1089 | 907 | 406 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | glassy | cross-off | cross-off | cross | cross | cross-off | cross-on | cross | cross-off | on | cross-off | cross-off | on | cross-off | cross-off | cross-on | cross | cross-off |
High Tide | 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 | 1:22PM2.13m | 1:20AM2.60m | 1:48PM1.89m | 1:46AM2.38m | |||||||
Low Tide | 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 | 7:26AM0.44m | 7:04PM0.75m | 7:58AM0.66m | 7:23PM0.95m | |||||||
— | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | |
6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 27 | 25 | 26 | 26 | 25 |
Feels °C | 28 | 28 | 29 | 28 | 27 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 15 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 |
1006 | 844 | 1850 | 3074 | 2344 | 2212 | 1742 | 1654 | 1650 | 1581 | 1581 | 1446 | 1307 | 1446 | 1554 | 1533 | 1285 | 1089 | 907 | 388 | |
Swell 2 Height (m) Direction Period (s) | SW 21 | SW 20 | SW 14 | — | — | — | — | — | — | — | SSE 6 | SSW 21 | SW 21 | SE 6 | — | — | SE 6 | SW 22 | SW 21 | SW 16 |
647 | 1491 | 763 | — | — | — | — | — | — | — | 27 | 45 | 71 | 47 | — | — | 25 | 18 | 18 | 406 | |
Swell 3 Height (m) Direction Period (s) | — | SE 6 | — | — | — | — | — | — | — | — | SW 24 | W 16 | SSW 6 | SW 19 | — | — | — | SW 22 | — | SE 5 |
— | 30 | — | — | — | — | — | — | — | — | 22 | 5 | 3 | 59 | — | — | — | 18 | — | 6 | |
Wind waves Height (m) Direction Period (s) | SSE 5 | — | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 6 | SE 5 | SE 5 | — | SE 5 | SE 5 | SE 6 | SE 5 | SE 5 | — | — | SE 5 | — |
15 | — | 32 | 65 | 35 | 49 | 42 | 44 | 18 | 47 | — | 24 | 60 | 114 | 13 | 68 | — | — | 12 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 108 | 0 | 0 | 0 | 2 | 119 | 262 | 0 | 116 | 118 | 0 | 116 | 0 | 0 | 116 | 2 | 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.










