
Surf Forecasts:
Wanjapu surf forecast from 17 Jul 2026:
- Best quality surf: Saturday 18 Jul, 5AM (local time) - 4.5ft (1.4m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 20 Jul, 2PM (local time) - 6.5ft (2.0m), 17s period, SW swell with 2,320 kJ wave energy.
- Next surfable swell (1★+): Saturday 18 Jul, 5AM (local time) - 4.5ft (1.4m), 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 Saturday (Jul 18) at 5AM. The primary swell is predicted to be 1.4m and 16s period with a secondary swell of 0.8m and 6s. Another secondary swell of 1.4m and 7s 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 2.0m 17s and forecast to arrive on Monday (Jul 20) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 7s period and expected on Saturday (Jul 18) at 11PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sat 18th Jul) | 4.5ft (1.4m) 16s |
| Best Surf | 5AM (Sat 18th Jul) | 4.5ft (1.4m) 16s |
| Most Powerful | 2PM (Mon 20th Jul) | 6.5ft (2.0m) 17s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
G’day, Rusty here, and I’ve been staring at the charts for Wanjapu. This is a reef break that’s exposed to the SW, and it’s a consistent spot for the advanced crew. Right now, the water is sitting at 80°, which is pretty much bang on average for this time of year—nothing unusual there.
The next couple of weeks are a mixed bag. We’ve got a few pulses of SW groundswell, but the wind is a real pain. It’s mostly cross-shore from the SE, which isn’t doing this place any favours. The first week is pretty average, with a few small windows of cleaner conditions.
Friday the 17th kicks off with a 4ft SW swell at 14 seconds, but the cross-shore wind is light, so waves will be a bit bumpy. The combined energy is strong (1109), but the quality is only marginal. It’s not a write-off, but it’s not a standout.
The real highlight looks like Monday the 20th. The morning shows a 6ft SW swell at 17 seconds, with combined energy skyrocketing to 2247. It’s a big, powerful groundswell. The wind is still cross-shore, but by the afternoon it turns cross-offshore from the ESE, and the report says “clean.” That’s your moment. 7ft of SW swell, perfect for experienced surfers. The longer period (16 seconds) means well-shaped waves, but it’s a reef, so it should handle that energy well. Crowds are sometimes here, so there might be a few out, but for that quality, it’s worth it.
After that, the wind gets messy again. Tuesday the 21st has a 6ft swell, but it’s blown out with 16 mph cross-shore winds. The rest of the week drops off fast.
The second week is lean. There’s a small uptick on the 27th of July with a 5ft SE swell (short period, 7 seconds), but the wind is clean for the afternoon. It’s a weird direction for this spot, so it’s a gamble.
Looking way out, the 31st of July and 1st of August are the long-range promise. The 31st has a 7ft SW swell at 18 seconds, with combined energy over 3000 – that’s massive. The wind is light, but cross-on, which might soften things up. The 1st of August shows a 7ft SW swell at 17 seconds. These are the biggest swells of the window, but they’re two weeks out, so treat them as promising but not locked in. If they come together, that’s an expert-only session.
Overall, the best bet is Monday the 20th for the afternoon session. The rest of the time, you’ll be battling the cross-shore. If you’re a beginner, stay away when the swell is over 5ft, which is most of the time here.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Fri afternoon. Warm (max 26°C on Fri morning, min 23°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Mon afternoon, min 24°C on Mon morning). Mainly fresh winds. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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 14 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 17 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 13 | SSW 13 | SSW 13 | SSW 14 | SW 14 | SSW 14 |
Wave Graph | |||||||||||||||||||||
597 | 1115 | 574 | 879 | 844 | 810 | 647 | 628 | 637 | 2191 | 2033 | 1909 | 1426 | 1187 | 975 | 632 | 563 | 555 | 264 | 463 | 261 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross | cross-off | cross | cross | cross-off | cross | cross-off | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-off |
High Tide | 11:57AM3.01m | 00:44AM2.65m | 12:39PM2.86m | 1:20AM2.70m | 1:20PM2.65m | 1:56AM2.69m | 2:00PM2.39m | 2:32AM2.62m | 2:41PM2.12m | 3:10AM2.50m | 3:28PM1.85m | 3:54AM2.36m | 4:35PM1.62m | 4:51AM2.22m | |||||||
Low Tide | 6:29PM0.03m | 6:36AM0.53m | 7:03PM0.15m | 7:20AM0.56m | 7:35PM0.32m | 8:04AM0.64m | 8:06PM0.52m | 8:49AM0.76m | 8:36PM0.74m | 9:39AM0.90m | 9:06PM0.96m | 10:44AM1.01m | 9:41PM1.16m | ||||||||
6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | |
— | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 5:59 | — | — | 5:59 | — | |
mm | — | 1 | 2 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 26 | 25 |
Feels °C | 28 | 27 | 26 | 27 | 26 | 24 | 26 | 26 | 24 | 25 | 25 | 24 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 16 | SW 13 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 17 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 13 | SSW 13 | SSW 13 | SW 12 | SW 14 | SSW 14 |
597 | 1115 | 352 | 879 | 844 | 810 | 647 | 628 | 637 | 2191 | 2033 | 1909 | 1426 | 1187 | 975 | 632 | 563 | 555 | 199 | 463 | 261 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | — | SE 6 | — | — | SSE 7 | SW 22 | SW 21 | SSE 6 | — | — | — | — | — | — | SW 18 | SSW 16 | — | SSW 14 | SW 18 | SW 11 |
449 | — | 78 | — | — | 76 | 19 | 112 | 69 | — | — | — | — | — | — | 80 | 104 | — | 264 | 12 | 90 | |
Swell 3 Height (m) Direction Period (s) | — | — | SW 16 | — | — | — | — | — | SSW 19 | — | — | — | — | — | — | — | — | — | SW 19 | — | SW 18 |
— | — | 574 | — | — | — | — | — | 475 | — | — | — | — | — | — | — | — | — | 15 | — | 12 | |
Wind waves Height (m) Direction Period (s) | SE 7 | SE 6 | SE 7 | SSE 6 | SE 6 | SE 7 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SSE 5 | SSE 5 | SSE 5 | SSE 5 | SSE 5 | SSE 5 | SSE 5 | SSE 6 |
63 | 136 | 230 | 49 | 132 | 204 | 88 | 145 | 186 | 56 | 61 | 64 | 46 | 39 | 32 | 42 | 54 | 58 | 45 | 59 | 85 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 116 | 118 | 20 | 119 | 118 | 0 | 119 | 116 | 20 | 119 | 0 | 108 | 116 | 265 | 263 | 313 | 265 | 262 | 313 | 265 | 33 |
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.










