Surf Forecasts:
Lagundri-The Machine surf forecast from 19 Jul 2026:
- Best quality surf: Monday 20 Jul, 7AM (local time) - 4ft (1.2m), 17s period, SSW swell with glassy winds.
- Most powerful swell: Monday 20 Jul, 1PM (local time) - 5.5ft (1.7m), 17s period, SSW swell with 1,657 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 7AM (local time) - 4ft (1.2m), 17s 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 Monday (Jul 20) at 7AM. The primary swell is predicted to be 1.2m and 17s period with a secondary swell of 0.9m 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 1.7m 17s and forecast to arrive on Monday (Jul 20) at 1PM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Mon 20th Jul) | 4ft (1.2m) 17s |
| Best Surf | 7AM (Mon 20th Jul) | 4ft (1.2m) 17s |
| Most Powerful | 1PM (Mon 20th Jul) | 5.5ft (1.7m) 17s |
Table - best surf conditions forecast for Lagundri-The Machine over the next 16 days.
The Lowdown
Hey, Rusty here again, same outlook but in feet and miles per hour.
We’ve got a solid run of waves starting Monday, 20 July, with a big pulse of long-period groundswell out of the SSW. Water temp is about average for this time of year, nothing to worry about. This is a sheltered reef, so it needs the right direction, and it’s got it. The energy is pumping at 1576, and with glassy conditions first thing Monday morning, we’re looking at clean 5ft waves on a 17-second period. That’s proper juice – 17 seconds is a long wait between sets but the waves will be packing a punch. Made for the advanced crew. Tuesday morning drops a bit to 5ft with a 14-second period and a light cross-on, so quality slips a little. Wednesday morning sees 4ft and glassy again, fun for a paddle. The swell keeps easing into the end of the week, with Saturday 25 July morning offering 4ft and glassy – a nice little cruisy session if you’ve got a log.
Then we hit a quiet spell. From Sunday 27 July through to Wednesday 30 July, it’s small – 2ft to 3ft – surfable but nothing to write home about.
But the end of the forecast window is the real deal. Thursday 30 July, we get a new very long-period groundswell starting to build, with 2ft waves on a 19-second period. It’s small but the period is wild, and it’s glassy. Friday 31 July is the standout – 4ft to 5ft of SSW swell, 16 to 17-second period, glassy all day. The energy is well over 1000, and the wind is dead calm. This reef is going to be firing. Saturday 1 August keeps the quality going into the first week of August with 5ft of clean SSW swell and glassy or light air.
Sunday 2 August holds good quality, with 5ft to 5ft and clean offshore winds from the NNW. Monday 3 August is still clean but easing a little, and Tuesday 4 August is back to 3ft with offshore winds.
This is a reef that loves a good SSW swell. The best days without question are Friday 31 July and Saturday 1 August – glassy, solid, long-period swell. It can get a few heads out there, so expect company. But for quality, that’s as good as it gets.
Rusty out.
Short Range ForecastModerate rain (total 17mm), heaviest on Sun night. Warm (max 28°C on Mon morning, min 26°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Wed night. Warm (max 28°C on Thu morning, min 26°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | S 12 | S 11 | S 10 | S 11 | S 10 | S 10 | SW 15 | SW 14 | SW 13 | SW 14 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1543 | 1487 | 1397 | 1010 | 822 | 682 | 547 | 384 | 227 | 169 | 327 | 323 | 424 | 459 | 361 | 239 | 262 | 241 | 215 | 218 | 189 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross-on | cross-on | on | glassy | glassy | on | cross-on | cross | cross-on | glassy | cross-on | cross-on | glassy | glassy | cross-on | glassy | glassy | glassy | glassy |
High Tide | 9:50AM0.66m | 10:43PM0.64m | 10:26AM0.56m | 11:36PM0.63m | 11:05AM0.46m | 00:40AM0.61m | 12:01PM0.38m | 1:54AM0.60m | 1:44PM0.33m | 3:07AM0.61m | 3:28PM0.33m | 4:06AM0.64m | 4:34PM0.35m | ||||||||
Low Tide | 4:04PM0.11m | 4:32AM0.26m | 4:34PM0.14m | 5:40AM0.31m | 5:08PM0.17m | 7:30AM0.32m | 5:54PM0.19m | 9:51AM0.29m | 7:03PM0.21m | 10:55AM0.23m | 8:28PM0.20m | 11:30AM0.18m | 9:38PM0.17m | ||||||||
 | |  | |  |  | | |  | | |  |  | | | | | | | | | |
 | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — |
 | — | 6:38 | — | — | 6:38 | — | — | 6:39 | — | — | 6:39 | — | — | 6:39 | — | — | 6:39 | — | — | 6:39 | — |
mm | 4 | 1 | — | 1 | — | 1 | — | — | 1 | — | — | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 32 | 31 | 31 | 32 | 31 | 32 | 32 | 31 | 30 | 32 | 31 | 31 | 32 | 32 | 31 | 32 | 32 | 32 | 32 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 16 | SSW 16 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | S 9 | S 12 | S 11 | S 10 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | S 10 | S 9 |
| kJ | 1543 | 1487 | 1397 | 1010 | 822 | 682 | 547 | 384 | 227 | 127 | 327 | 323 | 424 | 459 | 361 | 239 | 190 | 202 | 154 | 145 | 139 |
Swell 2 Height (m) Direction Period (s) | WNW 7 | WNW 7 | WNW 8 | S 7 | S 7 | S 7 | W 8 | S 7 | S 8 | SSW 12 | WNW 10 | SW 16 | WNW 9 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 13 | SW 14 | SW 14 |
| kJ | 18 | 17 | 24 | 27 | 24 | 42 | 29 | 35 | 64 | 169 | 32 | 90 | 28 | 107 | 149 | 209 | 262 | 241 | 215 | 218 | 189 |
Swell 3 Height (m) Direction Period (s) | S 7 | S 6 | S 7 | WNW 8 | WNW 8 | WNW 8 | SSW 18 | WNW 7 | SW 16 | WNW 11 | SW 15 | WNW 10 | SW 17 | WNW 9 | WNW 9 | SSW 16 | WNW 8 | WNW 8 | WNW 8 | WNW 9 | WNW 9 |
| kJ | 15 | 7 | 14 | 19 | 19 | 51 | 61 | 17 | 65 | 37 | 55 | 31 | 47 | 28 | 16 | 89 | 14 | 14 | 13 | 17 | 16 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | S 7 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 32 | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 13 | 13 | 64 | 0 | 0 | 64 | 64 | 13 | 13 | 0 | 13 | 13 | 0 | 0 | 167 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Nias | |||||||||||||||||||||
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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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