
Surf Forecasts:
Lagundri-The Machine surf forecast from 14 Sep 2026:
- Best quality surf: Monday 14 Sep, 7PM (local time) - 6ft (1.8m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 1AM (local time) - 6ft (1.9m), 16s period, SW swell with 1,964 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 7PM (local time) - 6ft (1.8m), 16s 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 Monday (Sep 14) at 7PM. The primary swell is predicted to be 1.8m and 16s period with a secondary swell of 0.9m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Lagundri-The Machine in the next 16 days are 1.9m 16s and forecast to arrive on Sunday (Sep 20) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Friday (Sep 18) at 1PM.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Mon 14th Sep) | 6ft (1.8m) 16s |
| Best Surf | 7PM (Mon 14th Sep) | 6ft (1.8m) 16s |
| Most Powerful | 1AM (Sun 20th Sep) | 6ft (1.9m) 16s |
Table - best surf conditions forecast for Lagundri-The Machine over the next 16 days.
The Lowdown
Alright, let’s talk about Lagundri-The Machine. This is a reef setup, sheltered from the open ocean, and it’s firing on a solid southwest groundswell. The water’s sitting at 86°, which is pretty much spot on for this time of year – nothing weird going on there.
The first real window is Monday morning, September 14th. We’ve got a clean 6ft SW swell with a 15-second period, and it’s glassy out there – just a whisper of ENE air. That’s proper. The energy’s sitting at 1487, so there’s a decent push behind it. This is the kind of morning where you want to be early, before the afternoon trades and storm risk mess things up. It’s a bit on the bigger side for beginners, but for anyone who knows what they’re doing, it’s on.
Tuesday morning, the 15th, is another standout – dead calm, 6ft SW, 15 seconds, crystal clear skies. No wind at all. That’s a glassy, clean session and the energy is still strong at 1431. This spot loves that southwest direction, and you can feel it.
Then we hit a bit of a lull. From Wednesday the 16th through to Sunday the 20th, it’s pretty average. The swell drops a touch, the winds get messy – mostly cross-on or onshore, and there’s a lot of storm risk. The energy dips down to around 551-760 on the 18th, and the surf gets a bit ragged. Not a total write-off, but you’d be scratching for a good one. The swell direction shifts a little more to the SSW, which still works, but the quality just isn’t there.
Now, here’s the standout of the whole run. Sunday the 27th into Monday the 28th. This is where it gets serious. Sunday morning, we’ve got 5ft SSW with a 21-second period – that’s proper groundswell, very long period. Energy is pumping at 2588. And it’s glassy. Sunday afternoon it jumps to 6ft, 19 seconds, and the energy is 3514. That’s strong. Then Monday morning the 28th, we’re looking at 7ft SSW, 17 seconds, energy at 2675, and again, glassy. This is for experienced surfers only – over 6ft on a reef with that kind of power, you need to know what you’re doing. The long period means it’s going to jack up and throw, and on a reef like this, that’s a beautiful thing – not like a beach break where it would just close out. This is the best of the whole forecast.
Before that, there’s a real dead patch around the 24th and 25th – poor conditions, choppy, light cross-onshore winds, and the swell drops to under 3ft. Honestly, that’s a good time to stay home or go for a paddle.
Also, the 21st and 22nd are worth a mention – Monday the 21st morning is glassy again with 6ft SSW and 14 seconds, energy at 1340. That’s a solid session. Tuesday the 22nd morning is clean too, though smaller at 4ft.
So, to sum it up: the early part of the run has a couple of clean mornings, but the real gold is right at the end – Sunday the 27th and Monday the 28th. That’s the one you want to clear your schedule for. Long period, solid size, glassy – it doesn’t get much better than that. And with the crowd factor being “sometimes,” you might get a few others out, but it’s not a circus.
Keep an eye on the tides and be ready to go when it’s glassy. This place can hold a lot of power, so don’t be shy, but respect the reef.
Rusty.
Short Range ForecastHeavy rain (total 29mm), heaviest during Mon morning. Warm (max 28°C on Tue morning, min 26°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 49mm), heaviest during Fri morning. Warm (max 28°C on Thu afternoon, min 25°C on Fri afternoon). Wind will be generally light. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 15 | SW 16 | SSW 13 | SW 14 | SW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SSW 15 |
Wave Graph | |||||||||||||||||||||
1399 | 1664 | 1761 | 1380 | 1254 | 1031 | 915 | 928 | 857 | 1016 | 1163 | 1208 | 351 | 614 | 589 | 694 | 1297 | 1964 | 1845 | 1672 | 1487 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | cross-off | glassy | cross-on | glassy | cross-on | on | on | cross-on | on | cross-on | cross-on | cross-off | cross-off | on | on | cross | cross | cross-on | glassy |
High Tide | 7:58PM0.80m | 8:02AM0.62m | 8:30PM0.77m | 8:28AM0.54m | 9:02PM0.71m | 8:50AM0.47m | 9:37PM0.64m | 9:07AM0.40m | 10:24PM0.58m | 9:09AM0.34m | 11:47PM0.53m | 1:56AM0.53m | |||||||||
Low Tide | 1:28PM0.02m | 2:06AM0.09m | 1:50PM0.04m | 2:40AM0.13m | 2:13PM0.06m | 3:15AM0.18m | 2:36PM0.10m | 3:56AM0.24m | 3:01PM0.14m | 5:01AM0.29m | 3:29PM0.20m | 4:19PM0.26m | |||||||||
6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:28 | — | — | 6:27 | — | — | 6:27 | — | — | 6:27 | — | — | 6:25 | — | — | 6:25 | — | — | 6:25 | — | |
mm | 7 | 2 | — | 1 | 1 | 4 | 3 | 2 | 9 | 1 | — | 14 | 13 | 5 | 13 | 3 | — | — | — | — | — |
Temp °C | 27 | 26 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 28 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 28 | 28 | 27 |
Feels °C | 32 | 30 | 30 | 33 | 32 | 31 | 31 | 31 | 30 | 30 | 31 | 30 | 30 | 26 | 27 | 29 | 29 | 31 | 31 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 15 | SW 16 | SSW 13 | SW 14 | SW 14 | SSW 14 | SW 17 | SW 16 | SW 16 | SW 16 | SSW 15 |
1399 | 1664 | 1761 | 1380 | 1254 | 1031 | 915 | 928 | 857 | 1016 | 1163 | 1208 | 351 | 614 | 589 | 501 | 1297 | 1964 | 1845 | 1672 | 1487 | |
Swell 2 Height (m) Direction Period (s) | S 6 | S 7 | S 8 | S 8 | S 8 | S 7 | S 6 | SW 20 | S 6 | W 10 | W 9 | WNW 9 | S 5 | SSW 5 | WNW 8 | SW 18 | SSW 13 | W 10 | WNW 9 | S 8 | WNW 8 |
66 | 77 | 58 | 44 | 43 | 40 | 39 | 186 | 101 | 117 | 83 | 110 | 43 | 36 | 70 | 694 | 427 | 49 | 25 | 33 | 20 | |
Swell 3 Height (m) Direction Period (s) | W 17 | S 6 | WSW 16 | W 9 | W 9 | W 8 | WNW 8 | WNW 8 | SW 18 | SW 18 | W 9 | SW 22 | WNW 10 | WNW 9 | SW 18 | W 8 | W 8 | — | W 13 | WNW 8 | WNW 8 |
22 | 53 | 24 | 7 | 6 | 5 | 13 | 13 | 311 | 111 | 61 | 18 | 157 | 110 | 263 | 31 | 31 | — | 3 | 22 | 12 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | S 6 | — | S 6 | — | S 6 | S 6 | S 6 | — | NW 4 | — | — | — | — | — | — | — |
— | — | — | — | — | 26 | — | 50 | — | 66 | 64 | 52 | — | 6 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 1 | 0 | 0 | 64 | 0 | 64 | 64 | 64 | 13 | 167 | 64 | 13 | 1 | 342 | 64 | 64 | 13 | 13 | 13 | 0 |
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.










