Surf Forecasts:
Nai Harn Beach surf forecast from 4 Sep 2026:
- Most powerful swell: Friday 11 Sep, 7PM (local time) - 6ft (1.8m), 7s period, W swell with 311 kJ wave energy.
Best Forecast Surf Conditions for Nai Harn Beach this week:
The most powerful waves expected at Nai Harn Beach in the next 16 days are 1.8m 7s and forecast to arrive on Friday (Sep 11) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 7s period and expected on Wednesday (Sep 09) at 7AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Fri 11th Sep) | 6ft (1.8m) 7s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on offer for Nai Harn Beach over the next couple of weeks.
Honestly, it’s a pretty bleak picture for the whole 16-day window. The swell is mostly small and weak, and the wind is a persistent problem. For the first eight days, from Friday 4th September right through to the morning of Friday 11th September, the surf is almost non-existent, with tiny waves under 3ft, a weak combined energy reading (often below 100), and a constant cross-onshore wind that’s messing everything up. It’s just choppy, messy, and not worth your time. There’s a real gap there with nothing to recommend.
Things start to look a bit more interesting from Thursday 10th September afternoon, when a pulse of swell pushes the combined energy up to 229, but the wind is still a fresh cross-onshore, so it’s going to be lumpy and poor. The swell picks up a bit more on Friday 11th September afternoon, hitting 6ft from the west with a combined energy of 285, but again, the wind is a strong cross-onshore, making it messy. This pattern continues through the weekend and into the start of the following week. The waves are there, with heights between 4ft and 6ft, and the energy is moderate (in the 300s), but the wind is just never good. It’s a lot of chop and lump.
The one slight glimmer comes on Tuesday 15th September. The morning sees a light breeze from the southwest, which is actually offshore for Nai Harn. The swell is a consistent 4ft from the west with a 9-second period, and the combined energy is a solid 245. The afternoon is even lighter, with a near-glassy cross-onshore wind. It’s still only a marginal call, but this is the best the whole forecast has to offer. The water temp is a warm 86°F, which is about normal for this time of year.
After that, it drops off again. Wednesday 16th September and Thursday 17th September mornings have a cross-offshore wind, which will clean things up, but the swell is dropping back to 2ft-3ft, and the energy is weak. By Friday 18th September, the cross-onshore wind is back, and the whole thing fizzles out.
So, for the entire 16-day period, there is no real standout. If you’re desperate, Tuesday 15th September is your best bet. It’s the only day with a decent swell, some energy in the water, and a wind that isn’t completely ruining it. But even then, keep your expectations low. This is a spot that can be inconsistent, and this run is a classic example of that. The forecast could change, but right now, it's a tough one.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sun afternoon. Warm (max 28°C on Fri night, min 28°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 47mm), heaviest during Wed afternoon. Warm (max 28°C on Mon night, min 27°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | |||||||||||||||
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) | W 7 | W 13 | W 7 | W 18 | W 17 | W 7 | WNW 5 | WNW 5 | WNW 6 | W 20 | W 20 | W 18 | W 18 | SW 17 | SW 16 | WSW 16 | W 7 | WSW 15 | WSW 15 | W 7 | W 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 23 | 3 | 15 | 6 | 6 | 9 | 14 | 30 | 40 | 7 | 7 | 6 | 6 | 11 | 10 | 25 | 178 | 21 | 22 | 271 | 286 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 4:19PM1.14m | 5:30AM1.42m | 6:57PM1.15m | 7:22AM1.52m | 8:23PM1.32m | 8:29AM1.69m | 9:12PM1.52m | 9:16AM1.85m | 9:51PM1.69m | 9:56AM1.96m | 10:25PM1.83m | 10:31AM2.01m | 10:57PM1.92m | ||||||||
Low Tide | 10:24AM0.68m | 10:20PM0.70m | 12:46PM0.65m | 00:41AM0.71m | 2:13PM0.47m | 2:08AM0.56m | 3:04PM0.28m | 3:03AM0.39m | 3:42PM0.12m | 3:46AM0.24m | 4:16PM0.01m | 4:23AM0.13m | 4:47PM-0.05m | ||||||||
 | |  | |  | |  | | | | |  | | |  |  | | | | |  | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — |
mm | — | — | — | — | 1 | — | — | — | — | — | 3 | 4 | 7 | 9 | 4 | 9 | 11 | 12 | 7 | 7 | 8 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 27 | 27 | 27 |
Feels °C | 30 | 29 | 30 | 31 | 30 | 30 | 29 | 29 | 30 | 28 | 28 | 28 | 27 | 26 | 27 | 27 | 26 | 26 | 25 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 13 | W 7 | W 7 | W 13 | W 7 | W 7 | W 16 | W 16 | W 15 | W 20 | W 18 | W 18 | SW 17 | SW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 15 | WSW 15 | W 24 |
| kJ | 45 | 3 | 33 | 24 | 3 | 9 | 4 | 5 | 5 | 4 | 7 | 6 | 6 | 11 | 10 | 25 | 23 | 21 | 22 | 22 | 43 |
Swell 2 Height (m) Direction Period (s) | W 14 | — | W 13 | W 13 | W 17 | W 12 | W 16 | W 12 | W 12 | W 20 | W 15 | — | — | — | W 13 | — | — | — | W 26 | W 26 | SW 24 |
| kJ | 15 | — | 3 | 3 | 6 | 3 | 5 | 3 | 3 | 7 | 4 | — | — | — | 3 | — | — | — | 13 | 13 | 22 |
Swell 3 Height (m) Direction Period (s) | — | — | — | W 18 | — | W 16 | W 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 6 | — | 5 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 7 | W 7 | W 7 | — | W 7 | WNW 5 | WNW 5 | WNW 5 | WNW 6 | W 6 | W 6 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 |
| kJ | 23 | 44 | 15 | — | 23 | 9 | 14 | 30 | 40 | 91 | 132 | 220 | 321 | 295 | 277 | 269 | 178 | 229 | 263 | 271 | 286 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 24 | 4 | 4 | 4 | 4 | 636 | 635 | 635 | 636 | 645 | 24 | 4 | 635 | 635 | 617 | 635 | 635 | 24 | 636 | 24 | 636 |
Best forecast wave conditions in Phuket | |||||||||||||||||||||
Best forecast wave conditions in Thailand | |||||||||||||||||||||
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Information about the Nai Harn Beach Surf forecast
The above surf forecast table for Nai Harn Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Nai Harn Beach can be found by selecting the local surf guide option on the grey menu. Our Nai Harn Beach 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 (Nai Harn Beach) 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 Nai Harn Beach 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.
Nai Harn Beach is 8 km (5 miles) from the city of Ban Chalong. If you plan a holiday in Phuket, look for hotels and other accommodation in Ban Chalong. Ban Chalong has rooms for a wide range of budgets as well as car hire and transport links.
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