Surf Forecasts:
Lagundri-The Machine surf forecast from 24 Aug 2026:
- Best quality surf: Friday 28 Aug, 1AM (local time) - 6.5ft (2.0m), 17s period, SW swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 10PM (local time) - 6.5ft (2.0m), 18s period, SW swell with 2,402 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 4AM (local time) - 6ft (1.8m), 15s period with SSW 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 25) at 4AM. The primary swell is predicted to be 1.8m and 15s period with a secondary swell of 0.3m and 8s. 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 2.0m 18s and forecast to arrive on Thursday (Aug 27) 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 25th Aug) | 6ft (1.8m) 15s |
| Best Surf | 1AM (Fri 28th Aug) | 6.5ft (2.0m) 17s |
| Most Powerful | 10PM (Thu 27th Aug) | 6.5ft (2.0m) 18s |
Table - best surf conditions forecast for Lagundri-The Machine over the next 16 days.
The Lowdown
Alright, grab your board. This is Rusty, and I’m looking at what’s ahead for us at Lagundri-The Machine. This is a sheltered reef break that handles a SW swell best, and it’s only for advanced surfers because when it’s on, it’s thick and powerful.
Right now, we’re in a bit of a lull. The first real action doesn’t kick in until Monday, August 24th, and even then it’s only offering marginal surf with questionable tides. Monday morning you’ll see a 6ft SSW swell at 17 seconds, but the energy is low (1750) and there’s a risk of thunderstorms. The wind is light from the SSE, but it’s not enough to save the day. That’s pretty much the story for Monday and Tuesday – nothing to get excited about.
The first real standout comes on Wednesday, August 26th, in the morning. The swell drops to 5ft from the SW with a 13-second period, but the magic is in the glass: a light W wind at 3 mph goes completely offshore at this break, leaving the surface glassy. The combined energy is moderate (779), so it’s not a monster, but it’ll be clean and fun for those who know the reef.
But the true highlight of this entire period is Thursday, August 27th. Both morning and afternoon are looking fantastic. You’ve got a 3ft to 4ft SW swell, but the period is a very long 19 seconds, which means real groundswell energy. The combined energy is strong (1488 and 1720), and the wind is glassy – SSE and SSW at 3 mph. This is as good as it gets for a clean, lined-up reef wave. That long period will make the sets well-spaced, so paddling out won’t be a fight, but the waves will be powerful for their size. This is the one to circle.
The water temperature is 86°F with a very small anomaly of 1°F, so it’s about as normal as you can get for this time of year. Warm and tropical.
From Friday, August 28th, through the weekend, the swell builds back up to 7ft from the SW, but the wind turns cross-onshore, and the energy climbs to strong levels (2035). It’ll be a bit bumpy, and for a reef break, that offshore wind is everything. Not the best call.
The next gem is on Tuesday, September 1st. The morning brings a 7ft SW swell at 16 seconds, with a light S wind that’s offshore. The combined energy is very strong (2729). This is a big wave day – only for experts. If you’re good enough, it’ll be a ripper, but the afternoon stays similar with a risk of thunderstorms.
Then, on Wednesday, September 2nd, the morning glass returns. A 6ft SW swell with a 16-second period and a light SSE wind at 3 mph offshore. Strong energy (1918) and glassy conditions. Another standout in the second week, but it’s a bit further out, so keep an eye on it.
The rest of the forecast fades into smaller, cross-onshore swell and poor conditions by September 8th. The surf really drops off after that, with the energy falling to weak levels and the wind picking up from the ESE at 9 mph, making it choppy and ugly.
So, overall, the best of the best is Thursday, August 27th, with a close second on Wednesday, September 2nd. Get out there when it’s glassy and the swell is from the SW, and you’ll score.
This is Rusty, signing off.
Short Range ForecastHeavy rain (total 45mm), heaviest during Mon night. Warm (max 28°C on Tue afternoon, min 26°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Sat night. Warm (max 28°C on Thu afternoon, min 26°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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 15 | SSW 14 | SW 13 | SSW 13 | SW 16 | SW 15 | SW 19 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 19 | SW 19 |
Wave Graph | |||||||||||||||||||||
1728 | 808 | 1566 | 1292 | 1208 | 774 | 732 | 590 | 539 | 738 | 1022 | 2347 | 1983 | 1651 | 1045 | 752 | 589 | 406 | 400 | 708 | 994 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross-on | cross-on | glassy | cross-on | cross | glassy | glassy | glassy | cross-on | cross-on | glassy | glassy | cross-on | glassy | cross-on | on | glassy |
High Tide | 4:32PM0.37m | 4:35AM0.67m | 5:07PM0.43m | 5:10AM0.73m | 5:37PM0.51m | 5:41AM0.78m | 6:04PM0.58m | 6:09AM0.81m | 6:32PM0.64m | 6:37AM0.82m | 7:01PM0.70m | 7:05AM0.80m | 7:30PM0.75m | ||||||||
Low Tide | 11:17AM0.19m | 9:32PM0.21m | 11:34AM0.15m | 10:24PM0.17m | 11:52AM0.11m | 11:04PM0.13m | 12:12PM0.08m | 11:41PM0.10m | 12:32PM0.05m | 00:16AM0.08m | 12:54PM0.03m | 00:50AM0.07m | 1:17PM0.02m | 1:25AM0.07m | |||||||
6:26 | — | — | 6:26 | — | — | 6:26 | — | — | 6:26 | — | — | 6:26 | — | — | 6:26 | — | — | 6:26 | — | — | |
— | 6:35 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:32 | — | |
mm | 2 | 5 | 11 | 2 | 2 | 11 | 3 | 1 | 8 | 1 | 1 | 2 | — | — | — | — | — | 3 | 1 | 1 | 3 |
Temp °C | 27 | 27 | 26 | 27 | 28 | 27 | 27 | 28 | 27 | 27 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 30 | 30 | 29 | 30 | 32 | 30 | 31 | 31 | 31 | 31 | 32 | 31 | 31 | 32 | 32 | 32 | 32 | 31 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 13 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SW 13 | SSW 13 | SW 16 | SW 15 | SW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 19 | SW 19 |
1728 | 530 | 1566 | 1292 | 1208 | 774 | 732 | 590 | 539 | 724 | 667 | 2347 | 1983 | 1651 | 1045 | 752 | 589 | 406 | 400 | 708 | 994 | |
Swell 2 Height (m) Direction Period (s) | WNW 8 | SSW 16 | WNW 9 | WNW 8 | WNW 9 | S 8 | S 7 | S 7 | SSW 12 | SW 19 | SW 19 | WNW 11 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | SSW 13 | SSW 12 |
12 | 808 | 15 | 13 | 15 | 40 | 36 | 25 | 164 | 738 | 1022 | 22 | 32 | 29 | 44 | 58 | 61 | 45 | 55 | 295 | 196 | |
Swell 3 Height (m) Direction Period (s) | WNW 10 | WNW 10 | — | W 18 | W 18 | WNW 8 | WNW 8 | SW 18 | S 7 | S 7 | S 8 | WNW 11 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | WNW 10 | SW 23 | SW 21 | S 9 | S 8 |
10 | 18 | — | 6 | 6 | 13 | 11 | 81 | 24 | 26 | 31 | 22 | 20 | 18 | 16 | 16 | 18 | 135 | 358 | 71 | 66 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 64 | 167 | 167 | 17 | 64 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 13 | 64 | 0 | 0 | 64 | 0 | 13 | 17 | 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.











