Lagundri-The Machine Surf Break

Lat Long: 0.58° N 97.72° E

Lagundri-The Machine Surf Forecast and Surf Report

Issued: 6 pm 17 Aug 2026 (local time)

Forecast update in  hr  min

Today's Lagundri-The Machine sea temperature is
30.0° C
0.8° 

Lagundri-The Machine surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


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 TypeTime (WIB) & Date Wave Height & Period
Next good surf (1 star+) 4AM (Tue 18th Aug)3.5ft (1.1m) 18s
Best Surf10AM (Tue 18th Aug)4.5ft (1.4m) 17s
Most Powerful10PM (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 Forecast

Heavy 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 Summary

Light 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
Rating
(10 max)
0
1
4
3
4
4
3
3
4
3
4
3
3
4
3
3
2
0
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
SSW
14
0.9
SSW
18
1.4
SSW
17
1.3
SW
20
2.4
SW
19
2.4
SW
18
2.5
SW
18
2.5
SSW
17
2.5
SW
16
2.5
SSW
16
2.2
SW
16
2
SSW
15
1.9
SSW
15
2
SSW
17
2.1
SSW
16
2.1
SSW
15
1.9
SSW
14
1.7
SSW
14
1.7
SSW
14
1.4
SSW
13
Wave Graph
Metric surfscale
Energy kJ
472
553
1081
1321
4192
3744
4355
4323
3319
3100
2291
1882
1655
2377
2257
2061
1525
1206
979
722
Wind (km/h)
10
SSE
5
S
5
SE
5
WSW
0
SSW
0
NNW
10
WSW
5
W
5
E
10
SE
5
E
10
SE
5
SE
5
ESE
5
SE
10
SE
10
S
15
SSE
10
SSE
5
S
Wind State
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
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
part cloud
thunderstorm
part cloud
thunderstorm
clear
thunderstorm
thunderstorm
clear
clear
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:28
6:28
6:28
6:28
6:28
6:28
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
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
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.

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