Surf Forecasts:
Wanjapu surf forecast from 19 Aug 2026:
- Best quality surf: Thursday 20 Aug, 8AM (local time) - 10ft (3.0m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 8AM (local time) - 10ft (3.0m), 17s period, SW swell with 4,527 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 8AM (local time) - 10ft (3.0m), 17s 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 Thursday (Aug 20) at 8AM. The primary swell is predicted to be 3.0m and 17s period with a secondary swell of 1.1m 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 3.0m 17s and forecast to arrive on Thursday (Aug 20) 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 1.7m 6s period and expected on Thursday (Aug 20) at 8PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Thu 20th Aug) | 10ft (3.0m) 17s |
| Best Surf | 8AM (Thu 20th Aug) | 10ft (3.0m) 17s |
| Most Powerful | 8AM (Thu 20th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break it down.
Wanjapu is a consistent advanced reef break, exposed to the SW. Water temp is 79°, right where it should be for this time of year.
The action starts Thursday morning with 8ft of SW groundswell, a very long 16-second period, and a massive amount of energy. The wind is light cross-shore, so it’s okay. But Thursday afternoon is the real deal—wind shifts to a light cross-offshore, cleaning the waves right up. Still 8ft, 16 seconds, and the energy is enormous. This is the standout. If you’re experienced, this is your session.
Friday drops to 8ft, but the period is 15 seconds in the morning, then 17 seconds in the afternoon. That’s very long period groundswell—great for a reef. The wind is cross-shore, so it’s not glassy, but it’s still good.
Saturday through Monday, the swell stays between 7ft and 8ft, but the wind gets more cross-onshore, making things choppy. Saturday afternoon is a write-off.
Tuesday the 25th sees the swell drop to 5ft, but with a 14-second period and light cross-shore wind, it’s clean and small. Friday the 28th brings another pulse of 8ft, 16 seconds, but the wind is cross-onshore and messy—more for the kite crowd.
The first week of September has swells from 6ft to 7ft, with periods from 14 to 20 seconds. The 31st of August morning has a 20-second period, but the wind is onshore. A real shame.
The best session is Thursday afternoon the 20th of August. Clean, powerful, and the wind is perfect. After that, it’s a mixed bag, but there are still a few good ones if you pick your moment.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu morning, min 23°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Sun afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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 16 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 15 | SSW 15 | SW 15 | SW 15 | SSW 15 | SW 16 | SW 15 | SW 14 | SW 16 | SW 15 | SW 14 | SSW 14 | SSW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3897 | 3545 | 2687 | 2356 | 3110 | 2694 | 2821 | 2291 | 1962 | 1785 | 1597 | 1358 | 1972 | 1531 | 1377 | 731 | 1694 | 1289 | 1094 | 1247 | 946 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | cross | cross-off | cross-on | cross-on | glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross-off | cross-on | cross-on | cross-off |
High Tide | 2:29PM1.87m | 2:41AM2.37m | 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 | ||||||||
Low Tide | 8:43AM0.77m | 8:07PM0.93m | 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 | |||||||
 | |  | | | | | | | | | | |  | | | | | | | | |
 | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 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 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 27 | 27 | 26 | 27 | 28 | 26 | 27 | 28 | 26 | 27 | 25 | 25 | 26 | 27 | 25 | 26 | 27 | 25 | 27 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 15 | SSW 15 | SW 15 | SW 15 | SSW 15 | SW 16 | SW 15 | SW 14 | SW 16 | SW 15 | SW 14 | SSW 14 | SSW 13 |
| kJ | 3897 | 3545 | 2687 | 2356 | 3110 | 2694 | 2821 | 2291 | 1962 | 1785 | 1597 | 1358 | 1972 | 1531 | 1377 | 731 | 1694 | 1289 | 1094 | 1247 | 946 |
Swell 2 Height (m) Direction Period (s) | SSE 7 | — | SE 6 | SW 18 | W 19 | SE 6 | SE 6 | S 26 | SE 6 | SSW 21 | SSW 20 | SSW 18 | SW 21 | SW 19 | — | SW 17 | — | — | — | — | SW 24 |
| kJ | 29 | — | 38 | 936 | 7 | 33 | 36 | 13 | 26 | 175 | 790 | 835 | 17 | 131 | — | 354 | — | — | — | — | 22 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SSW 24 | SW 21 | — | SSE 6 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 54 | 117 | — | 28 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SE 6 | SE 6 | SSE 6 | SE 6 | SE 6 | — | SE 6 | — | SE 5 | SSE 4 | — | SE 5 | SE 5 | SE 6 | SSE 5 | SE 4 | SSE 5 | S 5 | — | — |
| kJ | — | 58 | 95 | 22 | 69 | 83 | — | 38 | — | 24 | 35 | — | 25 | 31 | 44 | 12 | 26 | 31 | 11 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 119 | 0 | 0 | 118 | 262 | 0 | 118 | 118 | 0 | 118 | 263 | 108 | 119 | 118 | 108 | 119 | 118 | 33 | 116 | 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.
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