Surf Forecasts:
Lagundri-The Machine surf forecast from 17 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 10AM (local time) - 4.5ft (1.4m), 17s period, SSW swell with glassy winds.
- Most powerful swell: Wednesday 19 Aug, 10PM (local time) - 10ft (3.0m), 17s period, SW swell with 4,607 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 4AM (local time) - 3.5ft (1.1m), 18s period with SW swell.
Best Forecast Surf Conditions for Lagundri-The Machine this week:
The surf forecast for Lagundri-The Machine over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 4AM. The primary swell is predicted to be 1.1m and 18s period with a secondary swell of 1.0m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Lagundri-The Machine in the next 16 days are 3.0m 17s and forecast to arrive on Wednesday (Aug 19) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Tue 18th Aug) | 3.5ft (1.1m) 18s |
| Best Surf | 10AM (Tue 18th Aug) | 4.5ft (1.4m) 17s |
| Most Powerful | 10PM (Wed 19th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Lagundri-The Machine over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the table for this stretch. We’ve got one spot on the menu, and it’s a reef setup that takes a bit of know-how, so keep that in mind.
The first few days are a write-off, I’m not gonna sugarcoat it. Monday the 17th is a total no-go with poor conditions and a messy cross-onshore wind. We’ve got a bit of a wait, but things kick into life on Tuesday the 18th.
Tuesday morning the 18th is where it all turns on. The wind drops out to glassy, and we’ve got a clean 5ft swell from the SSW. That period is a massive 17 seconds, which is proper groundswell energy. The combined energy is a solid 2135 (moderate to strong), and for a reef like Lagundri-The-Machine, that long period is going to stack up nicely. The water is sitting at 86°, which is about 1° warmer than the norm for this time of year, so nothing too wild there. This is the standout morning of the whole run – clean, lined up, and handling that energy well. Keep in mind this break is for the experienced crew.
Wednesday the 19th morning is another cracker, with glassy conditions again and a bigger 8ft swell from the SW, with a period of 18 seconds and energy up at 3773 (strong). This is big, powerful surf. Anything over 8ft is expert territory, and this is right on that edge. It’s gonna be a big, heavy reef wave. The afternoon gets a bit tricky with a cross-shore wind, so the morning is the window.
The rest of the week from Thursday the 20th through to the weekend is a bit of a mixed bag. The swell holds in the 7ft to 8ft range, but the wind swings more cross-onshore, and the surf commentary flags it as marginal. The energy is still there (between 2144 and 3350), but the quality drops off. It’s not a total loss, but it’s not the clean, glassy stuff we had mid-week.
We hit a bit of a lull around Sunday the 23rd and Monday the 24th, with the swell dropping to 4ft to 6ft and the wind turning onshore, making it poor again. Not worth paddling out for.
Then, Tuesday the 25th gives us another little gem. The morning is glassy again, with a clean 5ft SSW swell at 15 seconds. The energy is 1204 (moderate), and the conditions are set for very good surf. The afternoon also goes glassy, which is a bonus. This is the second real standout – smaller than the previous week, but still clean and fun.
The rest of the run into the end of the month and the start of September has some promising moments. The 30th of August has a glassy morning with 5ft swell and good energy (1321), and the 31st of August has a bigger 6ft to 7ft SW swell with long period (20 seconds!) and strong energy (3266), but the wind is a bit cross-onshore, so it’s a gamble. The 1st of September morning is a beauty on paper – glassy, 7ft from the SW, 17 seconds, and excellent surf for the experienced. That’s a big, clean swell, but it’s a week and a half away, so keep an eye on it.
Bottom line: The best windows are the mornings of the 18th and 19th of August, and then the morning of the 25th of August. The 1st of September is a promising long-range prospect. Expect crowds at this spot sometimes, especially on the good days. This is a reef, so the long period swells will hold shape well.
Rusty.
Short Range ForecastHeavy rain (total 20mm), heaviest during Tue night. Warm (max 28°C on Mon afternoon, min 26°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Thu night. Warm (max 28°C on Thu afternoon, min 26°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 14 | SSW 18 | SSW 17 | SW 20 | SW 19 | SW 18 | SW 18 | SSW 17 | SW 16 | SSW 16 | SW 16 | SSW 15 | SSW 15 | SSW 17 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 |
Wave Graph | ||||||||||||||||||||
472 | 553 | 1081 | 1321 | 4192 | 3744 | 4355 | 4323 | 3319 | 3100 | 2291 | 1882 | 1655 | 2377 | 2257 | 2061 | 1525 | 1206 | 979 | 722 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | glassy | cross | glassy | glassy | cross | cross | glassy | cross-on | glassy | cross-on | cross-on | glassy | cross-on | cross-on | on | on | on | on |
High Tide | 9:12PM0.73m | 9:06AM0.61m | 9:50PM0.69m | 9:32AM0.51m | 10:32PM0.64m | 9:54AM0.43m | 11:28PM0.58m | 10:07AM0.35m | 00:55AM0.55m | 12:26PM0.29m | 2:40AM0.56m | 3:36PM0.31m | 3:50AM0.61m | |||||||
Low Tide | 3:09AM0.17m | 3:04PM0.08m | 3:50AM0.22m | 3:28PM0.11m | 4:40AM0.28m | 3:55PM0.15m | 6:04AM0.32m | 4:30PM0.19m | 11:12AM0.29m | 5:37PM0.23m | 11:03AM0.23m | 8:02PM0.24m | ||||||||
— | — | 6:28 | — | — | 6:28 | — | — | 6:28 | — | — | 6:28 | — | — | 6:28 | — | — | 6:28 | — | — | |
6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:36 | — | — | 6:36 | — | — | 6:36 | — | — | 6:35 | — | |
mm | — | — | 1 | 2 | 5 | 2 | 3 | 7 | — | — | 4 | — | 1 | — | 1 | 1 | — | — | — | 1 |
Temp °C | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 31 | 31 | 33 | 32 | 31 | 33 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 31 | 30 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 18 | SSW 17 | SSW 16 | SW 19 | SW 18 | SW 18 | SSW 17 | SW 16 | SSW 16 | SW 16 | SSW 15 | SSW 15 | SSW 17 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 |
472 | 553 | 1081 | 1321 | 4192 | 3744 | 4355 | 4323 | 3319 | 3100 | 2291 | 1882 | 1655 | 2377 | 2257 | 2061 | 1525 | 1206 | 979 | 722 | |
Swell 2 Height (m) Direction Period (s) | SSE 4 | SW 13 | SW 21 | SW 20 | W 8 | W 8 | W 8 | W 8 | W 8 | WSW 10 | S 5 | SSW 20 | SSW 19 | SW 16 | W 8 | WNW 7 | WNW 8 | SSW 21 | SSW 20 | SSW 19 |
8 | 176 | 742 | 1223 | 33 | 29 | 30 | 36 | 33 | 55 | 13 | 223 | 644 | 352 | 34 | 10 | 22 | 260 | 339 | 446 | |
Swell 3 Height (m) Direction Period (s) | WNW 8 | S 11 | SSW 13 | WNW 8 | S 9 | — | WSW 19 | — | — | — | WNW 9 | W 8 | WNW 9 | W 9 | W 15 | WNW 8 | SSW 24 | WNW 8 | WNW 8 | WNW 8 |
21 | 112 | 277 | 35 | 40 | — | 37 | — | — | — | 28 | 28 | 17 | 39 | 4 | 14 | 54 | 21 | 20 | 22 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 4 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 9 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 167 | 64 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 64 | 0 | 13 | 13 | 0 | 13 | 64 | 64 | 64 | 167 | 13 |
Best forecast wave conditions in Nias | ||||||||||||||||||||
Best forecast wave conditions in Indonesia | ||||||||||||||||||||
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Information about the Lagundri-The Machine Surf forecast
The above surf forecast table for Lagundri-The Machine provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Lagundri-The Machine can be found by selecting the local surf guide option on the grey menu. Our Lagundri-The Machine 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 (Lagundri-The Machine) 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 Lagundri-The Machine 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.
Are you planning a holiday in Nias? If you are looking for accommodation near Lagundri-The Machine, camping, hotels and holiday cottages in Nias, consider staying in Afia which is 91 km (57 miles) away.











