
Surf Forecasts:
Lagundri-The Machine surf forecast from 7 Sep 2026:
- Best quality surf: Sunday 13 Sep, 1PM (local time) - 7ft (2.1m), 17s period, SW swell with glassy winds.
- Most powerful swell: Saturday 12 Sep, 10PM (local time) - 7ft (2.1m), 19s period, SW swell with 3,219 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 1AM (local time) - 3ft (0.9m), 13s 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 (Sep 08) at 1AM. The primary swell is predicted to be 0.9m and 13s period with a secondary swell of 1.2m 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 2.1m 19s and forecast to arrive on Saturday (Sep 12) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Friday (Sep 11) at 1AM.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 8th Sep) | 3ft (0.9m) 13s |
| Best Surf | 1PM (Sun 13th Sep) | 7ft (2.1m) 17s |
| Most Powerful | 10PM (Sat 12th Sep) | 7ft (2.1m) 19s |
Table - best surf conditions forecast for Lagundri-The Machine over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's break this down for the fellas who think in feet and miles per hour.
We’re looking at Lagundri-The Machine for the next 16 days. This is an advanced reef break, so don’t expect any soft crumbly waves for learners. The first few days are a real struggle.
Monday, September 7th, starts off with a 4 ft swell from the SSW, but the wind is light onshore and there’s a risk of thunderstorms. The wave energy is moderate (1074), but the surf quality is poor. Tuesday and Wednesday stay small, with waves around 3 ft to 5 ft, and the wind stays cross-onshore. Not worth paddling out.
Thursday morning, September 10th, is the first real bright spot. The wind goes flat glassy, and we’ve got a clean 5 ft swell from the SW with a 16-second period. That’s proper groundswell. The ratings call it very good surf. This is the first standout window. The water temp is 86°, which is a touch warmer than usual for this time of year. Crowds can be an issue here, so get out there early.
Friday and Saturday see the swell creep up to 5 ft to 6 ft, but the wind shifts around, keeping the surface messy on and off. The energy gets strong (up to 2945). Then Sunday, September 13th, the afternoon turns glassy again with a 7 ft swell from the SW at 17 seconds. The file calls it excellent for experienced surfers. That size is squarely in expert territory, but the conditions will be pristine. This is the top-tier day of the first week.
We hit a mellow patch Monday and Tuesday with 6 ft to 6 ft waves and bumpy cross-onshore winds. Then Wednesday morning, September 16th, the glass returns for a 5 ft swell at 14 seconds. Clean, good waves.
Thursday, September 17th, gets wild. The wind cranks up from the WNW at 19 mph with a cross-offshore angle. The swell is 5 ft to 6 ft and the energy is strong (1773). The wind line will be clean, but that’s a heavy session for experts only.
Now, Friday, September 18th, and Saturday, September 19th, are the real standouts. Friday morning is glassy with a 6 ft SSW groundswell (15 seconds). Very good. But Saturday, September 19th, is the heavyweight. Both morning and afternoon are glassy with a 7 ft to 8 ft SSW swell at 16 seconds. The energy is very strong (up to 2579). This is an excellent day for experienced surfers. Long, powerful walls from a perfect direction.
The final few days taper off with smaller but clean options on Sunday and Monday mornings with 5 ft to 7 ft swells and glassy winds. By Tuesday the 22nd, the swell fades to just 3 ft, even with a long 20-second period. It’s done.
Your two sessions to circle are Thursday morning the 10th and Saturday the 19th. Both will be clean, have proper swell direction, and the reef will fire. Crowds can be thick here, so time it right. For the first few days, just wait it out. The juice comes later.
Rusty.
Short Range ForecastHeavy rain (total 24mm), heaviest during Mon morning. Warm (max 28°C on Tue morning, min 26°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 51mm), heaviest during Thu night. Warm (max 28°C on Thu afternoon, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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 15 | SSW 14 | SSW 20 | SSW 18 | SSW 18 | SSW 16 | SSW 15 | SSW 15 | SW 14 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | SW 21 | SW 15 | SW 19 | SW 18 | SW 17 | SW 17 | SW 16 |
Wave Graph | |||||||||||||||||||||
544 | 400 | 277 | 578 | 673 | 993 | 1014 | 829 | 482 | 929 | 1165 | 1115 | 1194 | 979 | 1302 | 773 | 2286 | 3020 | 2414 | 2275 | 1787 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | glassy | cross-on | cross-on | on | cross-on | on | on | glassy | cross-on | glassy | cross-on | on | cross-on | cross | on | cross-on | cross-on | glassy | off |
High Tide | 3:27PM0.38m | 3:42AM0.73m | 4:26PM0.47m | 4:35AM0.79m | 5:09PM0.57m | 5:18AM0.83m | 5:46PM0.66m | 5:56AM0.84m | 6:21PM0.74m | 6:31AM0.82m | 6:54PM0.79m | 7:04AM0.77m | 7:26PM0.81m | ||||||||
Low Tide | 10:11AM0.18m | 8:38PM0.21m | 10:51AM0.12m | 9:57PM0.16m | 11:23AM0.07m | 10:52PM0.10m | 11:51AM0.04m | 11:38PM0.06m | 12:17PM0.02m | 00:18AM0.04m | 12:42PM0.01m | 00:56AM0.04m | 1:05PM0.01m | 1:32AM0.06m | |||||||
6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | |
— | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:29 | — | — | 6:29 | — | — | 6:28 | — | |
mm | 5 | — | 5 | — | — | 5 | 2 | 1 | 6 | 1 | 2 | 14 | 3 | 1 | 10 | 6 | 1 | 13 | 3 | — | 2 |
Temp °C | 27 | 27 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 28 | 27 | 27 | 27 | 27 | 28 | 28 | 26 | 25 | 26 | 26 |
Feels °C | 30 | 29 | 29 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 30 | 30 | 30 | 31 | 32 | 31 | 30 | 28 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 8 | S 8 | S 10 | S 10 | SSW 16 | SSW 15 | SSW 15 | S 11 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 15 | SW 19 | SW 18 | SW 17 | SW 17 | SW 16 |
198 | 191 | 205 | 273 | 220 | 993 | 1014 | 829 | 274 | 929 | 1165 | 1115 | 1194 | 979 | 833 | 773 | 2286 | 3020 | 2414 | 2275 | 1787 | |
Swell 2 Height (m) Direction Period (s) | SSW 15 | SSW 14 | SSW 13 | SSW 18 | SSW 18 | S 10 | S 9 | S 9 | SW 14 | S 11 | S 10 | S 11 | W 8 | W 8 | SW 21 | SW 20 | SW 14 | S 9 | WNW 8 | SSE 6 | S 6 |
544 | 400 | 277 | 578 | 673 | 179 | 168 | 160 | 482 | 269 | 218 | 181 | 302 | 111 | 1302 | 746 | 598 | 61 | 6 | 43 | 38 | |
Swell 3 Height (m) Direction Period (s) | SSW 21 | SW 21 | SSW 20 | SSW 13 | SSW 12 | SSW 12 | S 15 | SSE 13 | SW 18 | W 11 | SSE 12 | SW 26 | S 10 | S 10 | S 10 | S 9 | S 9 | WNW 8 | WNW 8 | WNW 7 | WNW 8 |
45 | 109 | 259 | 189 | 117 | 82 | 39 | 57 | 255 | 9 | 15 | 26 | 130 | 96 | 92 | 64 | 61 | 6 | 6 | 5 | 7 | |
Wind waves Height (m) Direction Period (s) | S 8 | — | — | — | — | — | — | — | — | — | — | W 6 | — | — | — | — | — | — | SSE 5 | — | — |
287 | — | — | — | — | — | — | — | — | — | — | 64 | — | — | — | — | — | — | 32 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 64 | 64 | 0 | 13 | 64 | 13 | 13 | 64 | 64 | 0 | 167 | 0 | 13 | 64 | 13 | 13 | 64 | 13 | 13 | 0 | 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.










