
Surf Forecasts:
Wanjapu surf forecast from 13 Sep 2026:
- Best quality surf: Sunday 13 Sep, 8PM (local time) - 7.5ft (2.3m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 13 Sep, 5PM (local time) - 7.5ft (2.3m), 18s period, SW swell with 3,074 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 8PM (local time) - 7.5ft (2.3m), 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 Sunday (Sep 13) at 8PM. The primary swell is predicted to be 2.3m 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 2.3m 18s and forecast to arrive on Sunday (Sep 13) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Monday (Sep 14) at 8PM.
| Wave Type | Time (WITA) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sun 13th Sep) | 7.5ft (2.3m) 17s |
| Best Surf | 8PM (Sun 13th Sep) | 7.5ft (2.3m) 17s |
| Most Powerful | 5PM (Sun 13th Sep) | 7.5ft (2.3m) 18s |
Table - best surf conditions forecast for Wanjapu over the next 16 days.
The Lowdown
G'day, I'm Rusty, and I've got the goods on what's coming up for your local lineup. There's a solid swell window opening up, so let's get straight into it.
We're looking at a fantastic run starting this Sunday morning. The standout session is hands down Sunday morning, September 13th at Wanjapu. We've got a proper, long-period groundswell from the SW pushing in at a meaty 6 ft with an 18-second period, creating a very strong wave energy (2613). The wind is a complete zero—dead glassy—and with the water temp at a pleasant 80°, which is pretty much normal for this time of year. This is the one you circle on the calendar. It’s a powerful, clean reef break, so it’s strictly for the experienced crew, and you might find a few others out there with you, but it’ll be worth it. The swell is over 5 ft, so it's a bit much for the groms.
The energy continues through Sunday afternoon, although the wind swings cross-shore, making it a bit less perfect, and the swell builds to 8 ft. That's getting into expert-only territory. Monday still has size at 7 ft to 6 ft swell, but that cross-shore wind is still hanging around.
Tuesday afternoon, September 15th, offers a little redemption. The breeze cleans up and goes cross-offshore, giving us clean 6 ft SW swell. It's not as powerful as Sunday’s main event, but it's a solid wave for a session.
There's a bit of a lull through the middle of the week, but we get another absolute beauty on Sunday morning, September 20th. Again, glassy conditions with a chunky 6 ft SW groundswell at a 17-second period and a strong energy reading (2061). This is your second big call. It's still a long-period swell, so it'll be reeling off that reef, perfect for a point or reef setup.
The following week from the 22nd sees the swell drop off significantly, with heights around 5 ft and less energy. The wind is light and sometimes glassy, making for a fun, smaller wave, but it's nothing compared to the two Sunday standouts. We do get a spike in size on Friday the 25th afternoon with a 7 ft 18-second swell, but the wind is up and choppy, making it a bit of a messy, blown-out situation. The last real hurrah is on Monday morning, September 28th, with a small, glassy 4 ft swell to cap things off, but the party is mostly over by then.
Overall, you've got two exceptional, top-shelf mornings to aim for: Sunday the 13th and Sunday the 20th. Be there.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Sun afternoon, min 24°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SW 14 | SW 14 | SW 14 | SSW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 18 |
Wave Graph | |||||||||||||||||||||
1850 | 3074 | 2344 | 1919 | 1764 | 1654 | 1650 | 1581 | 1581 | 1325 | 1220 | 1446 | 1554 | 1533 | 1303 | 1034 | 920 | 733 | 676 | 658 | 984 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | cross-off | cross | cross | cross-off | cross-on | cross-off | cross-off | cross-on | cross-off | cross-off | on | cross-off | cross-off | cross | cross | off | cross-on | cross-on | glassy |
High Tide | 11:26AM2.84m | 11:38PM3.05m | 11:58AM2.73m | 00:04AM3.04m | 12:27PM2.57m | 00:30AM2.95m | 12:55PM2.36m | 00:55AM2.80m | 1:22PM2.13m | 1:20AM2.60m | 1:48PM1.89m | 1:46AM2.38m | 2:17PM1.65m | 2:15AM2.15m | |||||||
Low Tide | 5:29PM0.22m | 5:55AM0.11m | 5:55PM0.30m | 6:26AM0.14m | 6:19PM0.42m | 6:56AM0.26m | 6:43PM0.58m | 7:26AM0.44m | 7:04PM0.75m | 7:58AM0.66m | 7:23PM0.95m | 8:37AM0.90m | 7:38PM1.15m | ||||||||
5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:54 | — | — | |
— | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 26 | 27 | 27 | 26 | 25 | 26 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 |
Feels °C | 28 | 29 | 28 | 29 | 29 | 29 | 28 | 27 | 29 | 28 | 28 | 28 | 28 | 27 | 29 | 28 | 30 | 28 | 28 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SW 14 | SW 14 | SW 14 | SSW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 18 |
1850 | 3074 | 2344 | 1919 | 1764 | 1654 | 1650 | 1581 | 1581 | 1325 | 1220 | 1446 | 1554 | 1533 | 1303 | 1034 | 920 | 733 | 676 | 658 | 984 | |
Swell 2 Height (m) Direction Period (s) | SW 14 | — | — | — | — | SE 5 | — | — | SSE 6 | SE 5 | SW 21 | SE 6 | SE 5 | — | SE 6 | SW 22 | SW 21 | SE 5 | SW 20 | SW 18 | SW 13 |
763 | — | — | — | — | 30 | — | — | 36 | 4 | 71 | 47 | 13 | — | 25 | 18 | 18 | 6 | 134 | 332 | 286 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 24 | SSW 21 | W 16 | SW 19 | — | — | — | SW 22 | — | SW 20 | SE 6 | — | SE 6 |
— | — | — | — | — | — | — | — | 22 | 45 | 5 | 96 | — | — | — | 18 | — | 99 | 9 | — | 24 | |
Wind waves Height (m) Direction Period (s) | SE 6 | SE 5 | SE 6 | SSE 5 | SE 6 | SE 5 | SE 5 | SE 5 | — | SSW 5 | SE 5 | SE 6 | SE 5 | SE 5 | — | — | SE 6 | — | — | SSE 6 | — |
36 | 31 | 46 | 19 | 46 | 69 | 21 | 74 | — | 9 | 60 | 114 | 27 | 46 | — | — | 16 | — | — | 15 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 262 | 2 | 2 | 2 | 0 | 262 | 0 | 0 | 118 | 2 | 0 | 116 | 262 | 0 | 116 | 108 | 0 | 116 | 118 | 0 |
Best forecast wave conditions in Sumba | |||||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










