Surf Forecasts:
Wanjapu surf forecast from 13 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 5AM (local time) - 7ft (2.2m), 19s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 5AM (local time) - 10ft (3.0m), 17s period, SW swell with 4,891 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 11PM (local time) - 6ft (1.8m), 16s 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 Thursday (Aug 13) at 11PM. The primary swell is predicted to be 1.8m and 16s period with a secondary swell of 0.7m and 9s. 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 3.0m 17s and forecast to arrive on Thursday (Aug 20) 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 1.2m 6s period and expected on Sunday (Aug 16) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 13th Aug) | 6ft (1.8m) 16s |
| Best Surf | 5AM (Wed 19th Aug) | 7ft (2.2m) 19s |
| Most Powerful | 5AM (Thu 20th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s take a look at what’s coming for Wanjapu over the next couple of weeks. This is a reef break, wide open to the SW, and the best swell direction is SW – that’s the key. Water temp is around 79°, about average for this time of year, so nothing out of the ordinary.
We’re in a quiet spell right now. The first proper chance isn’t until Tuesday morning, 18 August. That’s roughly a 5-day wait from today, with only so-so conditions in between.
Tuesday the 18th, early, it gets interesting. Swell is 4ft from the SW, with a long 16-second period – proper groundswell. Winds are glassy, just a slight air, so it’ll be clean as can be. Combined energy is moderate at 1895. This is your first standout: Wanjapu with clean glass and a long-period SW swell. For a reef, that long period is a bonus – the waves will shape up nicely. At 4ft, it’s a good size for most, but the power from that period means it’s best for experienced surfers. Crowds can happen here, so you might see a few others.
Wednesday morning, 19 August, is the cream of the crop. Swell jumps to 8ft from the SW, period stretches to 18 seconds – very long-period energy, strong combined energy at 3285. Winds are glassy again, from the SSW at 5 km/h, so it’s offshore. This is prime: big, clean, powerful lines on the reef. But at 8ft, it’s expert-only – too big for beginners. The direction is dead on the optimum SW, so the reef will be firing its best.
Thursday morning, 20 August, the swell peaks at 10ft from the SW, 16-second period, combined energy strong at 4342. Winds glassy. This is heavy – for experts only. If the conditions hold, it’s a serious session.
The swell stays solid over the weekend but with more cross-shore wind. Friday 21 August morning has 7ft SW with cross-shore breezes – still fun, but not glassy.
In the second week, another notable window is Thursday morning, 27 August, with glassy winds and 6ft SW swell, period 14 seconds, combined energy 1771. That’s a clean, mellow morning for experienced surfers if you missed the early action. Long-range is always a bit less certain, but the pattern of SW groundswell with morning glass is promising.
Best of the bunch? Wednesday morning, 19 August – 8ft SW, 18-second period, glassy, optimum direction. Circle that one. Tuesday the 18th is a solid second choice for cleaner but smaller waves. The 20th and 27th are worth a look for the experienced crew.
Keep your eye on those morning glass-offs and don’t sleep on that Wednesday session.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Fri afternoon, min 23°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Sun afternoon, min 23°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Thu 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | ||||||||||||||
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) | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SW 16 | SSW 16 | SW 16 | SW 18 | SW 18 | SW 17 |
Wave Graph | ||||||||||||||||||||
1928 | 1671 | 1379 | 1102 | 974 | 1817 | 2171 | 1734 | 1811 | 1547 | 1174 | 947 | 934 | 607 | 786 | 1373 | 1852 | 3267 | 3796 | 4484 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-on | cross | cross-off | on | cross | glassy | on | cross | cross-off | on | cross | cross-off | glassy | cross | cross-off | glassy | cross | cross-off |
High Tide | 11:11PM2.60m | 11:06AM2.99m | 11:43PM2.79m | 11:45AM2.95m | 00:14AM2.90m | 12:21PM2.83m | 00:44AM2.93m | 12:55PM2.63m | 1:13AM2.88m | 1:27PM2.39m | 1:41AM2.76m | 1:58PM2.13m | 2:10AM2.58m | |||||||
Low Tide | 4:59PM0.06m | 5:02AM0.51m | 5:31PM0.03m | 5:41AM0.36m | 6:02PM0.08m | 6:19AM0.30m | 6:30PM0.18m | 6:55AM0.32m | 6:57PM0.33m | 7:31AM0.42m | 7:22PM0.52m | 8:06AM0.57m | 7:46PM0.72m | |||||||
— | — | 6:15 | — | — | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | |
6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 24 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 27 | 24 | 27 | 28 | 26 | 28 | 30 | 27 | 29 | 29 | 28 | 28 | 29 | 28 | 28 | 29 | 27 | 28 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SW 16 | SSW 16 | SW 16 | SW 18 | SW 18 | SW 17 |
1928 | 1671 | 1379 | 1102 | 974 | 1817 | 2171 | 1734 | 1811 | 1547 | 1174 | 947 | 934 | 607 | 786 | 1373 | 1852 | 3267 | 3796 | 4484 | |
Swell 2 Height (m) Direction Period (s) | SSE 9 | SSE 8 | S 7 | SSW 21 | SSW 19 | SSE 6 | S 5 | SE 6 | SE 5 | — | SSE 6 | SSE 5 | SSW 24 | SW 18 | SW 13 | SW 21 | SW 20 | SE 6 | SE 6 | SE 6 |
16 | 67 | 36 | 300 | 650 | 12 | 5 | 24 | 25 | — | 21 | 10 | 56 | 327 | 451 | 1240 | 753 | 18 | 40 | 36 | |
Swell 3 Height (m) Direction Period (s) | — | SSW 24 | SW 21 | — | S 6 | SSE 6 | — | — | — | — | — | — | SSW 20 | SSE 6 | SW 21 | SE 6 | SE 6 | — | — | — |
— | 54 | 117 | — | 10 | 6 | — | — | — | — | — | — | 38 | 21 | 658 | 42 | 29 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | SSE 8 | — | S 6 | SSE 5 | — | SE 5 | — | — | SE 6 | — | — | ESE 5 | — | — | — | — | — | — | — |
— | 110 | — | 20 | 12 | — | 13 | — | — | 38 | — | — | 19 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 118 | 0 | 116 | 118 | 0 | 2 | 118 | 0 | 116 | 118 | 0 | 2 | 108 | 0 | 0 | 108 | 0 | 0 | 118 | 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.











