Surf Forecasts:
Wanjapu surf forecast from 6 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 3,586 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 0.7m 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-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 Sunday (Sep 13) 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
G’day, Rusty here. Let’s get into it.
We’ve got a solid run of SW groundswell heading for Wanjapu, a reef break that’s exposed and picks up the good stuff from that direction. The water temp anomaly isn’t flagged, so it’s about average for this time of year – nothing weird going on.
The pattern through the week is a bit of a mixed bag. The combined swell energy is strong to very strong, sitting in the 1857 to 3349 range, but for the first few days the wind and conditions keep things marginal. Monday the 7th and Tuesday the 8th have cross-shore breezes and a bit of chop, so the quality isn’t there despite solid 7ft to 7ft SSW swell and a long 14-second period. Wednesday the 9th is similar – 8ft of SSW swell (16 sec) in the morning but cross-onshore wind messes it up. It’s really not worth paddling out yet.
The first standout comes on Sunday the 13th of September. Afternoon sees a clean, cross-off breeze from the ESE with 8ft SW swell and a very long 18-second period. That’s proper groundswell, and for a reef like Wanjapu that’s a dream. The combined energy is pumping at 3349. This is the best of the whole run – powerful, clean, and built for experienced surfers. Keep in mind it’s a reef, so it’s not a beginner wave at 8ft. Crowds are possible here sometimes, so don’t expect it empty.
Monday the 14th afternoon also looks good – similar 7ft SW swell, 16 sec, and clean conditions with that cross-off ESE breeze. Another excellent session for those who know the wave.
From there, the swell holds around 5ft to 7ft through the second week, and the best windows are on the 15th, 17th, and 20th of September. The 20th Sunday morning stands out – glassy conditions with 7ft SW swell at 16 sec. That’s about as clean as it gets for a reef. The combined energy is 2153, still solid.
Overall, the first few days are a write-off. The real action kicks off Sunday the 13th afternoon, and if you can get out then, you’ll be smiling. After that, the second week has a few clean windows but nothing as powerful as that Sunday.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Mon morning, min 24°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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 16 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 19 |
Wave Graph  | |||||||||||||||||||
 kJ | 2441 | 1835 | 1582 | 1272 | 1309 | 1588 | 2296 | 3062 | 2864 | 2330 | 1261 | 2529 | 2201 | 2066 | 1860 | 1520 | 1124 | 1006 | 1476 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross-off | cross | cross | cross-off | cross-on | cross-off | cross | cross-on | cross | cross-off |
High Tide | 5:18AM2.18m | 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 | |||||||
Low Tide | 9:18PM1.37m | 1:39PM0.88m | 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 | |||||||
 |  |  | | | |  | | | | | | | | | | | | | |
 | — | 6:03 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:00 | — | — | 6:00 | — | — |
 | 6:00 | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 26 | 27 | 26 |
Feels °C | 25 | 26 | 26 | 25 | 27 | 27 | 26 | 27 | 27 | 26 | 29 | 28 | 25 | 28 | 28 | 29 | 29 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 19 |
| kJ | 2441 | 1835 | 1582 | 1272 | 1309 | 1405 | 2296 | 3062 | 2864 | 2330 | 1261 | 2529 | 2201 | 2066 | 1860 | 1520 | 1124 | 1006 | 1476 |
Swell 2 Height (m) Direction Period (s) | — | SW 24 | SW 22 | SW 20 | SSW 19 | SW 18 | SSW 12 | — | — | — | SSW 18 | — | SE 5 | SSW 26 | SW 24 | SE 6 | SW 21 | SW 21 | SW 14 |
| kJ | — | 22 | 73 | 338 | 1004 | 1588 | 1032 | — | — | — | 1021 | — | 28 | 66 | 90 | 33 | 548 | 647 | 746 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 27 | — | — | SW 24 | SSE 5 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 28 | — | — | 197 | 10 | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SE 4 | SE 4 | SE 4 | ESE 5 | SE 5 | SE 5 | SE 6 | SE 5 | SE 5 | SE 5 |
| kJ | — | — | — | — | — | — | — | — | — | 19 | 13 | 14 | 75 | 22 | 58 | 88 | 20 | 53 | 57 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 108 | 118 | 118 | 108 | 118 | 118 | 108 | 118 | 118 | 108 | 2 | 265 | 108 | 118 | 2 | 33 | 116 | 262 | 33 |
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.
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