
Surf Forecasts:
Lagundri-The Machine surf forecast from 10 Aug 2026:
- Best quality surf: Tuesday 11 Aug, 4AM (local time) - 6ft (1.8m), 19s period, SSW swell with glassy winds.
- Most powerful swell: Tuesday 11 Aug, 4PM (local time) - 7.5ft (2.3m), 18s period, SSW swell with 3,443 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 4AM (local time) - 6ft (1.8m), 19s 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 11) at 4AM. The primary swell is predicted to be 1.8m and 19s period with a secondary swell of 1.5m 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 2.3m 18s and forecast to arrive on Tuesday (Aug 11) at 4PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Tue 11th Aug) | 6ft (1.8m) 19s |
| Best Surf | 4AM (Tue 11th Aug) | 6ft (1.8m) 19s |
| Most Powerful | 4PM (Tue 11th Aug) | 7.5ft (2.3m) 18s |
Table - best surf conditions forecast for Lagundri-The Machine over the next 16 days.
The Lowdown
Alright folks, Rusty here, with a look at what we've got coming down the pipe.
We're dialled into a solid run of SSW groundswell for the next couple of weeks. The standout is Lagundri-The Machine, a classic reef break that's going to light up with plenty of size and clean conditions. The water temp is sitting right about average for this time of year, which is no surprise.
Let's get into it. The action kicks off Monday, August 10th, with some solid 6ft sets from the SSW, but that morning onshore breeze will put a bit of a bump on it. The real quality starts to show on Tuesday, August 11th. By Tuesday afternoon, the wind drops to glassy, and we're looking at 8ft of SSW groundswell with a period of 18 seconds. The energy is pumping at (3511) – that's proper power. This is an excellent window for experienced surfers. The 19-second period on Tuesday morning is incredibly long, meaning the sets will be fat and lined up, but the wind is a bit messy then.
Wednesday, August 12th, has a similar story: morning cross-on, but the afternoon goes glassy again with 6ft SSW swell. The energy is a bit lower at (1538), but still a very good session. Thursday and Friday, August 13th and 14th, are all about those glassy mornings. Thursday's morning cross-shore isn't ideal, but the afternoon goes glassy with 5ft of S swell. The real gem is Friday, August 14th, where the morning is glassy, the afternoon is dead calm, and we have a consistent 6ft SSW swell. The energy is in the moderate range (1852 and 1675), but the clean conditions will make it feel much better.
Saturday, August 15th, starts glassy in the morning with 5ft S swell, but the afternoon gets a touch of cross-on. Then we hit a bit of a lull. Sunday, August 16th, through Monday, August 17th, the swell drops off to 4ft or less and the wind is messy. The energy drops to (618-749). It’s not flat, but it’s not worth getting excited about.
Now, the swell builds again. Tuesday, August 18th, the energy comes back up (1536-2172) but the wind is cross or cross-on, making it tricky. The real show returns on Wednesday, August 19th, with a solid 8ft SSW swell, but it's cross-on which is a shame. The real standouts in the second week are Thursday, August 20th, and Friday, August 21st. Thursday brings 8ft SW swell with glassy offshore winds in the morning, and the energy is strong at (3398). Friday is even better – dead calm, glassy, with 7ft SW swell and a massive energy reading of (2816). These are serious, powerful waves for the experienced crew. After that, it slowly winds down through the weekend of August 22nd and 23rd, with the swell dropping to 7ft and cross-on winds. The run finishes strong on Monday, August 24th, with a glassy morning and 6ft SSW swell, and Tuesday, August 25th, with dead calm and 5ft SSW swell.
So, the best of the best is Thursday, August 20th, and Friday, August 21st. Those days are pure gold for the experienced surfer. The reefs will be handling the long-period energy beautifully.
Rusty.
Short Range ForecastHeavy rain (total 37mm), heaviest during Mon night. Warm (max 28°C on Mon morning, min 26°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 45mm), heaviest during Sat night. Warm (max 28°C on Thu morning, min 25°C on Fri afternoon). Wind will be generally light. | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
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 14 | SSW 22 | SSW 19 | SSW 19 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | S 13 | S 12 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | S 14 | S 13 | S 13 | S 12 | S 15 | SSW 14 |
Wave Graph | |||||||||||||||||||||
1187 | 1111 | 1724 | 2530 | 3443 | 2605 | 2197 | 1537 | 1518 | 633 | 566 | 1400 | 1482 | 1358 | 1441 | 869 | 784 | 563 | 513 | 711 | 752 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | glassy | glassy | cross | glassy | glassy | glassy | cross-off | glassy | glassy | cross | cross | cross-on | cross-on | on |
High Tide | 4:23PM0.40m | 4:45AM0.83m | 5:18PM0.48m | 5:33AM0.88m | 6:02PM0.56m | 6:16AM0.91m | 6:43PM0.63m | 6:56AM0.90m | 7:21PM0.69m | 7:32AM0.86m | 7:59PM0.73m | 8:06AM0.79m | 8:35PM0.74m | ||||||||
Low Tide | 11:04AM0.12m | 9:43PM0.13m | 11:46AM0.07m | 10:46PM0.08m | 12:21PM0.03m | 11:39PM0.05m | 12:53PM0.01m | 00:25AM0.03m | 1:23PM0.00m | 1:08AM0.04m | 1:50PM0.01m | 1:49AM0.07m | 2:16PM0.03m | 2:29AM0.11m | |||||||
6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:28 | — | — | 6:28 | — | — | 6:28 | — | — | |
— | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | |
mm | 2 | 1 | 9 | 5 | 7 | 2 | 2 | 2 | 7 | 4 | 6 | 8 | 7 | 1 | — | — | 2 | 17 | 2 | 4 | 4 |
Temp °C | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 25 | 26 | 28 | 28 | 27 | 27 | 27 | 26 |
Feels °C | 32 | 32 | 31 | 32 | 32 | 31 | 32 | 32 | 32 | 32 | 32 | 32 | 31 | 29 | 30 | 32 | 32 | 30 | 31 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 13 | SSW 19 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | S 13 | S 12 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | S 14 | S 13 | S 13 | S 12 | S 15 | SSW 14 |
1187 | 1111 | 867 | 2530 | 3443 | 2605 | 2197 | 1537 | 1518 | 633 | 566 | 1400 | 1482 | 1358 | 1441 | 869 | 784 | 563 | 513 | 711 | 752 | |
Swell 2 Height (m) Direction Period (s) | WNW 8 | SSW 22 | SSW 19 | SSW 13 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | SSW 20 | SW 16 | SSW 18 | S 11 | S 11 | S 11 | SW 19 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | WNW 8 |
55 | 1051 | 1724 | 632 | 22 | 22 | 22 | 12 | 77 | 236 | 540 | 401 | 272 | 282 | 184 | 547 | 299 | 411 | 318 | 221 | 39 | |
Swell 3 Height (m) Direction Period (s) | SSW 23 | WNW 8 | SW 21 | W 8 | — | WNW 10 | SSW 13 | WNW 10 | WNW 8 | SSW 19 | SW 15 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 10 | S 18 | S 16 | WNW 9 | WNW 9 | SW 26 |
365 | 55 | 548 | 34 | — | 11 | 17 | 10 | 11 | 286 | 137 | 37 | 41 | 40 | 38 | 34 | 165 | 134 | 26 | 30 | 26 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 13 | 13 | 13 | 13 | 17 | 13 | 13 | 0 | 0 | 13 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 13 | 64 | 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.











