
Surf Forecasts:
Wanjapu surf forecast from 10 Aug 2026:
- Best quality surf: Tuesday 11 Aug, 8AM (local time) - 8ft (2.5m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 11 Aug, 8AM (local time) - 8ft (2.5m), 17s period, SSW swell with 4,222 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 8AM (local time) - 8ft (2.5m), 17s 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 Tuesday (Aug 11) at 8AM. The primary swell is predicted to be 2.5m and 17s period with a secondary swell of 0.5m and 21s. 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 17s and forecast to arrive on Tuesday (Aug 11) 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 0.9m 6s period and expected on Tuesday (Aug 18) at 5AM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Tue 11th Aug) | 8ft (2.5m) 17s |
| Best Surf | 8AM (Tue 11th Aug) | 8ft (2.5m) 17s |
| Most Powerful | 8AM (Tue 11th Aug) | 8ft (2.5m) 17s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
Rusty here, lookin’ at what we’ve got for the next couple weeks. Wanjapu (this is a reef setup, so it’s got some structure to it) is the only spot we’re working with, and overall, it’s not gonna blow your mind at first. There’s a rough start, with no real gems right away. The first few days from Tuesday, August 11th, through to the end of that week, you’ve got swell showing up around 5ft to 8ft, but the wind’s mostly cross or cross-on, keeping things messy. The water temp sits around 78°F, which is pretty much normal for this time of year.
Come Saturday morning, August 15th, things get interesting. Swell from the SSW at 6ft, period a long 17 seconds—that’s proper groundswell energy—and the wind goes glassy. The combined wave energy is decent at (1852), and for an experienced surfer, those long period lines will peel nicely over the reef. Crowds are possible though, so keep that in mind. The Saturday afternoon turns a bit cross again, so the morning window is the one.
Then there’s a bit of a lull into Sunday and Monday—still some swell but that cross-on wind makes it tough to get stoked about. The Monday morning, August 17th, has another glassy period with 5ft swell and a 14-second period, energy (1107), but the size is a little smaller.
Now, here’s the real standout: hold on for Friday, August 21st, morning. That’s when the conditions lock in. SSW swell hitting 8ft, period 17 seconds, combined energy a hearty (4021). And the wind? Glass. Dead calm. That’s a solid groundswell for experienced surfers only—over 8ft is expert territory—and the long period will wrap into the reef with some serious shape. Crowds might be around, but for a morning like that, it’s worth it.
Saturday, August 22nd, morning also gets glassy with the same 8ft SSW swell, period 16 seconds, energy (3208). Another excellent window, but the afternoon goes cross-on again.
After that, the second week fades a bit. Swell sticks around 5ft to 8ft but the wind turns mostly cross or onshore, and the quality gets patchy. The glassy windows are the only real highlights here, so aim for that late August 21st morning.
If you’re not on the reef those glassy mornings, the rest is either cross-onshore chop or just average. This reef handles the long period well, but you need the wind to play nice. Don’t wait too long.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Wed morning, 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 Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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 16 | SSW 16 | 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 | SSW 14 | SW 14 |
Wave Graph | |||||||||||||||||||||
3937 | 3085 | 2751 | 1567 | 2173 | 755 | 1907 | 1951 | 1671 | 1379 | 1102 | 974 | 1817 | 1978 | 1904 | 1811 | 1629 | 1174 | 1057 | 934 | 661 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-off | cross-off | cross-on | cross-on | cross | cross-on | cross-on | cross-off | glassy | cross | glassy | cross-on | cross | cross-off | glassy | cross | cross-off |
High Tide | 8:37AM2.59m | 10:03PM2.10m | 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 | |||||||
Low Tide | 3:43PM0.35m | 3:28AM0.99m | 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 | ||||||||
6:16 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | |
— | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 24 | 26 | 26 | 25 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 25 | 24 | 23 | 26 | 26 | 25 | 26 | 25 | 24 | 27 | 27 | 24 | 28 | 27 | 26 | 27 | 29 | 28 | 28 | 29 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 16 | SSW 16 | 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 | SSW 14 | SW 14 |
3937 | 3085 | 2751 | 1567 | 2173 | 755 | 1907 | 1951 | 1671 | 1379 | 1102 | 974 | 1817 | 1978 | 1904 | 1811 | 1629 | 1174 | 1057 | 934 | 661 | |
Swell 2 Height (m) Direction Period (s) | — | SW 19 | — | SSW 18 | — | SSW 16 | — | SSE 9 | S 8 | SSE 7 | SSW 21 | SSW 19 | SSE 6 | SSE 5 | SE 5 | — | — | SE 6 | SW 25 | SE 5 | SW 18 |
— | 1100 | — | 547 | — | 651 | — | 27 | 84 | 37 | 300 | 650 | 12 | 10 | 23 | — | — | 15 | 25 | 6 | 258 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SSW 24 | SW 21 | — | — | — | — | — | — | — | — | SW 25 | SW 23 | SE 6 |
— | — | — | — | — | — | — | — | 54 | 117 | — | — | — | — | — | — | — | — | 25 | 85 | 28 | |
Wind waves Height (m) Direction Period (s) | — | SSE 4 | SE 4 | SSE 5 | — | E 4 | — | — | — | — | S 6 | SSE 7 | SSE 6 | SSE 5 | — | SE 5 | SE 5 | — | — | SE 5 | — |
— | 13 | 19 | 19 | — | 7 | — | — | — | — | 22 | 26 | 23 | 16 | — | 15 | 14 | — | — | 21 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 119 | 119 | 118 | 116 | 118 | 108 | 116 | 118 | 108 | 118 | 118 | 0 | 0 | 118 | 0 | 2 | 118 | 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.











