Surf Forecasts:
Wanjapu surf forecast from 4 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 5AM (local time) - 6ft (1.8m), 13s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 2AM (local time) - 8ft (2.5m), 17s period, SSW swell with 4,060 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 5AM (local time) - 6ft (1.8m), 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 1.8m and 13s 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 2.5m 17s and forecast to arrive on Wednesday (Sep 09) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Sep 05) at 8AM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Tue 8th Sep) | 6ft (1.8m) 13s |
| Best Surf | 5AM (Tue 8th Sep) | 6ft (1.8m) 13s |
| Most Powerful | 2AM (Wed 9th Sep) | 8ft (2.5m) 17s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s see what Wanjapu is cooking up over the next couple of weeks.
From Friday the 4th of September, there’s swell around, but it’s a mixed bag. The wind is mostly cross or cross-onshore, and the wave reports keep calling it marginal. The combined energy is building from 815 up past 1200 on Saturday, but the onshore breeze is putting a chop on it. Not the cleanest.
The real standout looks like Sunday the 13th of September. That morning, the wind turns light onshore from the southwest at just 6 mph, which is about as clean as it gets here, and the swell is a solid 7ft out of the southwest with a very long period of 18 seconds. That’s proper groundswell. The energy is strong (3570), and with those light winds, the reef should hold some great lines. This is for advanced surfers only. The long period means longer lulls between sets, but the waves will have real punch.
Another good one is Saturday the 12th of September. The morning is glassy with a light offshore from the southwest at 3 mph, and a 6ft SW swell at 15 seconds. Clean, moderate energy (1799), and fun for those who know the break.
Crowds can show up sometimes, so on those cleaner days, you won’t be alone.
Water temp is 79°, right around average for this time of year. And since it’s a reef, those long-period swells will wrap in nicely.
Later in the second week, around the 18th and 19th, another pulse of SW groundswell rolls through, but the wind gets cross-onshore again. Worth checking if the forecast sharpens, but less certain.
If you’re an advanced surfer, aim for the morning of Sunday the 13th or Saturday the 12th. Those are your best bets.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Mon afternoon, min 24°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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 13 | SW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SW 18 | SSW 17 | SSW 16 | SSW 16 | SW 16 | SW 15 | SW 16 | SW 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 799 | 419 | 1179 | 1512 | 1560 | 1193 | 2699 | 2441 | 1748 | 1582 | 1204 | 1151 | 1588 | 4060 | 3062 | 2663 | 2262 | 1358 | 2320 | 2379 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross |
High Tide | 2:11PM1.94m | 2:20AM2.60m | 3:06PM1.65m | 3:17AM2.37m | 5:44PM1.46m | 5:18AM2.18m | 8:33PM1.69m | 7:32AM2.27m | 9:14PM2.00m | 8:45AM2.49m | 9:46PM2.30m | 9:35AM2.69m | 10:15PM2.59m | |||||||
Low Tide | 7:48PM0.86m | 9:21AM0.78m | 8:20PM1.10m | 11:03AM0.97m | 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 | |||||||
 |  | |  | | | | | | | | | |  | | | | | | | |
 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — |
 | 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 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 24 |
Feels °C | 27 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 27 | 26 | 25 | 28 | 26 | 25 | 26 | 26 | 26 | 27 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 17 | SSW 16 | SSW 16 | SW 16 | SW 15 | SW 16 | SW 16 |
| kJ | 799 | 405 | 1179 | 1512 | 1560 | 1193 | 2699 | 2441 | 1748 | 1582 | 1204 | 1151 | 1427 | 4060 | 3062 | 2663 | 2262 | 1358 | 2320 | 2379 |
Swell 2 Height (m) Direction Period (s) | SSW 6 | SSW 14 | W 16 | SSW 5 | SW 18 | SSW 17 | SSW 13 | — | SW 24 | SW 22 | SW 20 | SSW 19 | SW 18 | — | — | SSW 21 | — | SW 18 | — | SW 26 |
| kJ | 4 | 419 | 5 | 2 | 154 | 510 | 784 | — | 22 | 73 | 338 | 1004 | 1588 | — | — | 45 | — | 790 | — | 28 |
Swell 3 Height (m) Direction Period (s) | — | SSW 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 202 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSE 4 | SE 4 | SSE 4 | SE 4 | SE 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 12 | 28 | 21 | 17 | 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 118 | 108 | 116 | 118 | 108 | 118 | 118 | 108 | 313 | 118 | 108 | 118 | 118 | 118 | 118 | 119 | 119 | 119 | 119 | 108 |
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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