Surf Forecasts:
Wanjapu surf forecast from 21 Aug 2026:
- Best quality surf: Friday 28 Aug, 8AM (local time) - 8ft (2.5m), 18s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 28 Aug, 8AM (local time) - 8ft (2.5m), 18s period, SW swell with 4,257 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 11PM (local time) - 7.5ft (2.3m), 16s period with SW 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 Friday (Aug 21) at 11PM. The primary swell is predicted to be 2.3m and 16s period with a secondary swell of 1.0m and 6s. 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 18s and forecast to arrive on Friday (Aug 28) 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 1.5m 6s period and expected on Sunday (Aug 23) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Fri 21st Aug) | 7.5ft (2.3m) 16s |
| Best Surf | 8AM (Fri 28th Aug) | 8ft (2.5m) 18s |
| Most Powerful | 8AM (Fri 28th Aug) | 8ft (2.5m) 18s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
Alright, Rusty here, let’s talk about Wanjapu.
Right now, there’s some surf on the way, but it’s not going to be perfect straight away. We’ve got a solid run of swell coming through, but the wind is going to be a bit of a pain for most of it. The water temp is sitting at 79°, which is pretty much what you’d expect for this time of year, nothing unusual there.
Friday the 21st kicks things off with a chunky 7ft SW groundswell, with a long period of 15 seconds. That’s a lot of energy coming in (3151). The wind is light cross-shore in the morning, which isn’t terrible, but the tide and conditions are making it a bit messy. It’s surfable, but it’s not the standout.
The real moment to watch is Wednesday the 2nd of September. Early morning looks special: glassy conditions, with a solid 8ft SW swell at 17 seconds. The energy is pumping (4233) and the wind is off. That’s the one for the experienced crew – it’s going to be a bit heavy and clean. For beginners, that’s too big, but for anyone who knows what they’re doing, that’s the best of the whole forecast.
Before that, we’ve got a bit of a lull in quality. The swell stays around 5ft to 8ft through the week, but the wind is mostly cross or cross-onshore. It’s consistent, but not clean. You’ll still find waves, just not the kind you’ll write home about.
After that Wednesday standout, the swell drops a bit but hangs around. Thursday the 3rd still has 8ft SW swell, but the wind gets up and chops things up. By Saturday the 5th, we get a nice 4ft SW groundswell with a very long 20-second period, but with light cross wind. That’s more of a mellow day for the reefs and points.
Overall, Wanjapu is a consistent reef break, so it won’t go flat, but the best call is Wednesday the 2nd of September morning – glassy, powerful, and for the experienced only. Crowds are possible, but on a Wednesday morning, you might get lucky.
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Fri morning, min 23°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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) | SW 15 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SSW 15 | SW 15 | SW 15 | SSW 15 | SW 16 | SW 15 | SSW 14 | SW 16 | SW 15 | SW 14 | SSW 14 | SSW 13 | SW 13 | SW 16 | SW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2197 | 2893 | 2694 | 2627 | 2291 | 1962 | 1785 | 1597 | 1358 | 1972 | 1531 | 1237 | 1126 | 1449 | 1140 | 1094 | 1065 | 888 | 511 | 644 | 3578 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross-on | cross | cross | cross-on | cross | cross-off | cross-on | cross | cross-off | cross | cross | cross-off | on | cross-on | cross | cross-on | cross-on | cross |
High Tide | 3:08PM1.61m | 3:22AM2.16m | 5:09PM1.39m | 4:56AM1.98m | 10:23PM1.56m | 7:25AM2.01m | 9:48PM1.77m | 8:39AM2.20m | 10:04PM1.98m | 9:23AM2.40m | 10:23PM2.20m | 9:58AM2.59m | 10:44PM2.40m | ||||||||
Low Tide | 9:30AM0.97m | 8:25PM1.13m | 10:54AM1.14m | 8:29PM1.34m | 2:18PM1.08m | 11:41PM1.56m | 3:12PM0.86m | 2:42AM1.40m | 3:41PM0.66m | 3:26AM1.18m | 4:06PM0.49m | 3:59AM0.96m | 4:30PM0.34m | 4:29AM0.75m | |||||||
 | |  | | | | |  | | | | | | | | | | | | | | |
 | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 27 | 27 | 26 | 27 | 29 | 27 | 27 | 28 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SSW 15 | SW 15 | SW 15 | SSW 15 | SW 16 | SW 15 | SSW 14 | SW 16 | SW 15 | SW 14 | SSW 14 | SSW 13 | SW 13 | SSW 12 | SW 18 |
| kJ | 2197 | 2893 | 2694 | 2627 | 2291 | 1962 | 1785 | 1597 | 1358 | 1972 | 1531 | 1237 | 1126 | 1449 | 1140 | 1094 | 1065 | 888 | 511 | 496 | 3578 |
Swell 2 Height (m) Direction Period (s) | SW 18 | W 19 | SE 6 | SE 5 | S 26 | SE 6 | SSW 21 | SSW 20 | SSW 18 | SW 21 | SW 19 | SE 5 | — | — | SSW 5 | S 5 | SW 20 | SW 18 | SW 16 | SW 16 | — |
| kJ | 936 | 7 | 33 | 35 | 13 | 28 | 175 | 790 | 835 | 17 | 131 | 42 | — | — | 5 | 7 | 15 | 150 | 318 | 644 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SSW 24 | — | — | SE 6 | — | — | — | — | — | — | — | — | SW 24 | S 7 | SW 21 | — |
| kJ | — | — | — | — | — | 54 | — | — | 38 | — | — | — | — | — | — | — | — | 22 | 27 | 454 | — |
Wind waves Height (m) Direction Period (s) | SE 6 | SE 6 | — | — | SE 5 | — | SE 5 | SE 5 | ESE 6 | SE 5 | SE 5 | ESE 6 | SE 4 | SE 4 | SE 5 | — | — | SE 4 | SE 4 | SE 4 | SE 5 |
| kJ | 18 | 52 | — | — | 35 | — | 19 | 63 | 101 | 38 | 45 | 101 | 18 | 17 | 24 | — | — | 17 | 4 | 5 | 33 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 118 | 119 | 0 | 118 | 108 | 2 | 118 | 118 | 0 | 262 | 119 | 108 | 119 | 118 | 0 | 116 | 118 | 33 | 116 | 119 | 108 |
Best forecast wave conditions in Sumba | |||||||||||||||||||||
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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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