Surf Forecasts:
Wanjapu surf forecast from 14 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 4,484 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 8AM (local time) - 4ft (1.2m), 18s 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 Saturday (Aug 15) at 8AM. The primary swell is predicted to be 1.2m and 18s period with a secondary swell of 1.3m and 14s. Another secondary swell of 0.8m 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 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 1.5m 6s period and expected on Thursday (Aug 20) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sat 15th Aug) | 4ft (1.2m) 18s |
| 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
Alright, let’s get into it. The only spot firing in the forecast is Wanjapu, a solid reef break that’s got some serious pulse coming through. This is a consistent, advanced wave that loves a southwest swell, and we’ve got plenty of that lined up. The water temp is sitting right around 79°, which is bang on average for this time of year, so no surprises there.
The best of the whole window lands on Wednesday morning, August 19th. We’re looking at a clean 8ft groundswell out of the southwest, with a very long 18-second period pushing a heap of energy (combined energy of 3396). The wind is glassy, coming light from the west-southwest, so the surface will be smooth as butter. This is a standout session for experienced surfers only—if you’re not comfortable in solid, powerful reef waves, sit this one out.
Thursday morning, August 20th, is another cracker. The swell jumps to 10ft from the southwest, still with a long 17-second period, and the energy is thumping hard (4161). The wind is glassy again from the south. This is big, serious surf—experts only. The sets will be meaty and well-spaced, making the paddle out a bit easier, but the takeoff will demand respect.
There’s a gap after that, with marginal conditions for the next few days. The wind turns cross-shore or cross-onshore, and the quality drops right off. Not worth paddling out for.
Then we get another promising window late in the run. Saturday morning, August 30th, brings a clean 7ft southwest groundswell, 17-second period, and glassy conditions from the south-southwest. The energy is solid (2860). This is another excellent morning for the experienced crew, but remember, it’s two weeks out, so treat it as a promising call rather than a sure thing.
The earlier standout window is the one to lock in. Wednesday morning, August 19th, is the pick of the entire forecast. Glassy, powerful, long-period groundswell—this is the kind of session that makes you remember why you put in the time.
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Sat afternoon, min 24°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Tue morning, min 23°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
AM | 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 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SW 16 | SW 16 | SW 16 | SW 18 | SW 18 | SW 17 | SW 17 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2001 | 2171 | 1734 | 1811 | 1875 | 1174 | 947 | 934 | 607 | 786 | 1333 | 2008 | 3377 | 4091 | 4284 | 4133 | 4039 | 2687 | 2075 | 2657 | 2408 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | off | cross-on | cross | cross-off | cross-on | cross | cross-off | cross-on | cross | cross-off | glassy | cross | cross-off | glassy | cross | cross-off | cross-on | cross | cross-off |
High Tide | 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 | 2:29PM1.87m | 2:41AM2.37m | 3:08PM1.61m | 3:22AM2.16m | |||||||
Low Tide | 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 | 8:43AM0.77m | 8:07PM0.93m | 9:30AM0.97m | 8:25PM1.13m | ||||||||
 |  |  | | | | | |  | | | | | | | | | | | | | |
 | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 28 | 29 | 28 | 29 | 29 | 27 | 29 | 30 | 26 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SW 16 | SW 16 | SW 18 | SW 18 | SW 17 | SW 17 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 |
| kJ | 2001 | 2171 | 1734 | 1811 | 1875 | 1174 | 947 | 934 | 607 | 465 | 1333 | 2008 | 3377 | 4091 | 4284 | 4133 | 4039 | 2687 | 2075 | 2657 | 2408 |
Swell 2 Height (m) Direction Period (s) | SSE 5 | S 5 | SSE 6 | SE 5 | — | SSE 5 | SSE 5 | SSW 24 | SW 18 | SW 16 | SW 20 | SW 20 | SE 6 | — | SE 6 | SE 7 | — | SE 6 | SE 6 | — | SE 6 |
| kJ | 17 | 5 | 21 | 20 | — | 18 | 9 | 56 | 258 | 786 | 1228 | 392 | 19 | — | 30 | 28 | — | 35 | 16 | — | 33 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SSW 20 | SW 23 | SW 21 | SE 6 | SE 6 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | 38 | 193 | 742 | 25 | 28 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SE 5 | SE 5 | — | — | SE 5 | — | — | SE 5 | — | — | SSE 6 | — | — | ESE 6 | — | — | SE 5 | — | — | SE 5 | SE 6 |
| kJ | 23 | 19 | — | — | 25 | — | — | 18 | — | — | 12 | — | — | 69 | — | — | 119 | — | — | 35 | 83 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 108 | 0 | 116 | 108 | 0 | 2 | 108 | 0 | 2 | 108 | 0 | 0 | 108 | 0 | 0 | 118 | 0 | 119 | 262 | 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.
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