
Surf Forecasts:
Wanjapu surf forecast from 11 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: Wednesday 19 Aug, 8AM (local time) - 7.5ft (2.3m), 19s period, SW swell with 3,565 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 5AM (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 5AM. The primary swell is predicted to be 1.8m and 16s period with a secondary swell of 1.0m and 5s. 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 19s and forecast to arrive on Wednesday (Aug 19) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Monday (Aug 17) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 13th Aug) | 6ft (1.8m) 16s |
| Best Surf | 5AM (Wed 19th Aug) | 7ft (2.2m) 19s |
| Most Powerful | 8AM (Wed 19th Aug) | 7.5ft (2.3m) 19s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let’s get into it.
We’ve got a slow start on the radar for the next couple of weeks, but don’t let that fool you. There’s a pulse of proper energy coming through, and it’s all about waiting for the winds to play nice. The water’s sitting at 79°, which is pretty much normal for this time of year, so no surprises there.
The first few days are a bit of a write-off for quality. Wednesday morning sees some 7ft southwest swell, but it’s coming with a cross-shore breeze and the call is marginal – just a bit lumpy and not doing the reef any favors. The combined energy is strong at 2351, but the wind is just messing with the surface. Thursday and Friday are similar stories; there’s swell in the water, but the cross and cross-on winds keep things chopped up. You’ll see a lot of movement, but not many clean ones.
Now, here’s the first window to get excited about. Saturday morning, the 15th. We’ve got a strong 6ft southwest groundswell with a 17-second period, and it’s glassy. The energy is reading at 1832, which is solid, and that light air is exactly what this reef needs. It’s not huge, but it’s clean and organized. This is the standout for the first week, for my money. The afternoon gets a little more wind on it, so make the most of the morning. Tuesday the 18th morning also looks like a gem – glassy again with a 4ft southwest swell and a long 16-second period, but with softer energy at 2104. It might be a bit smaller, but it’ll be clean and fun on the longer boards.
After that, things start to build. We’re watching a bigger southwest swell for the 19th and 20th. By the 20th, we’re looking at a solid 10ft southwest swell, but the wind is going to be a problem – cross-shore, and the period drops to 16 seconds. It’s a lot of water moving (energy readings around 4074), but it’s going to be a bit of a beast and probably not that clean. The 22nd could be even bigger – 10ft again – but the winds are all over the place. This is expert territory, for sure, and even then, conditions look challenging. This isn’t the kind of swell you want if you’re after a relaxing paddle.
The timing is tight. The cleanest, most manageable waves are on Saturday the 15th and Tuesday the 18th. That’s your window. The bigger stuff later in the week is powerful, but the winds are not our friend.
For the second week, it’s less inspiring. The swell backs off a bit, but the wind stays mostly cross or cross-on, keeping things lumpy. There are a few moments on the 24th morning and the 25th where it could be borderline, but nothing that really gets the heart racing. The 26th looks poor, so don’t plan your life around it. It just fades out from there.
So, my call: if you can only make one session, make it Saturday the 15th morning. If it’s about the size, be patient for the big swells but be prepared for a battle. Keep an eye on the on the 19th and 20th – the size is there, but you’ll need a spot that can handle the power and wind.
Rusty, out.
Short Range ForecastMostly dry. Warm (max 26°C on Fri afternoon, min 23°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Sat afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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 15 | SSW 17 | SSW 13 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SW 14 | SW 14 | SSW 16 | SW 16 | SW 16 |
Wave Graph | |||||||||||||||||||||
1804 | 2380 | 755 | 1729 | 1928 | 1671 | 1379 | 1102 | 974 | 1817 | 1978 | 1734 | 1811 | 1629 | 1174 | 947 | 834 | 661 | 897 | 1631 | 2008 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | on | cross-on | cross-off | cross-on | cross | cross-off | glassy | cross-on | glassy | cross-on | cross | cross | cross-on | cross | cross-off | glassy | cross | cross-off |
High Tide | 9:36AM2.79m | 10:39PM2.37m | 10:24AM2.94m | 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 | |||||||
Low Tide | 4:23PM0.17m | 4:18AM0.72m | 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 | ||||||||
6:16 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | |
— | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 25 | 24 | 25 | 26 | 25 | 25 | 26 | 26 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 26 | 26 | 25 | 28 | 27 | 24 | 27 | 27 | 26 | 28 | 29 | 28 | 27 | 29 | 28 | 27 | 29 | 28 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 17 | SSW 13 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SW 14 | SW 14 | SSW 16 | SW 16 | SW 16 |
1804 | 2380 | 755 | 1729 | 1928 | 1671 | 1379 | 1102 | 974 | 1817 | 1978 | 1734 | 1811 | 1629 | 1174 | 947 | 834 | 661 | 897 | 1631 | 2008 | |
Swell 2 Height (m) Direction Period (s) | SSW 18 | — | SSW 16 | — | — | SSE 8 | S 7 | SSW 21 | SSW 19 | S 6 | SSE 5 | SE 5 | SE 5 | — | SE 6 | SSE 5 | SE 5 | SW 18 | SW 13 | SW 20 | SSW 20 |
547 | — | 651 | — | — | 83 | 36 | 300 | 650 | 15 | 10 | 13 | 14 | — | 26 | 10 | 7 | 327 | 451 | 1061 | 485 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SSW 24 | SW 21 | — | — | — | S 6 | — | — | — | — | SW 25 | SW 24 | SE 6 | SW 21 | — | SE 6 |
— | — | — | — | — | 54 | 117 | — | — | — | 5 | — | — | — | — | 25 | 90 | 37 | 756 | — | 30 | |
Wind waves Height (m) Direction Period (s) | — | SSE 5 | SE 5 | — | — | SSE 8 | SSE 7 | SSE 6 | SSE 7 | — | — | — | — | SE 5 | — | — | SE 5 | SE 6 | — | SE 6 | — |
— | 39 | 51 | — | — | 113 | 53 | 23 | 25 | — | — | — | — | 29 | — | — | 25 | 102 | — | 25 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 118 | 33 | 2 | 118 | 108 | 116 | 116 | 0 | 0 | 118 | 0 | 116 | 118 | 2 | 116 | 116 | 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.











