Surf Forecasts:
Nai Harn Beach surf forecast from 10 Aug 2026:
- Most powerful swell: Monday 17 Aug, 4AM (local time) - 7ft (2.2m), 8s period, W swell with 603 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 2.2m 8s and forecast to arrive on Monday (Aug 17) at 4AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 8s period and expected on Saturday (Aug 15) at 10AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Mon 17th Aug) | 7ft (2.2m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright crew, Rusty here. Let’s look at what’s on offer for Nai Harn Beach. I’ll be straight with you – it’s a rough stretch ahead. The wind is almost always coming from the west, which is a constant cross-onshore breeze, and it’s making a mess of things. The swell is there at times, but the quality is just not good for paddling. We’ve got a long blank run before anything even looks close to surfable, so don’t hold your breath.
For the first week, from today, Tuesday the 11th, right through to the 18th, the surf is a write-off. We’ve got a mix of weak, short-period windswell and some stronger pulses, but the wind state is either fresh cross-onshore or strong cross-onshore. The water temp is about average for the time of year, so no issues there, but you won’t be enjoying it. On Tuesday the 11th, the swell is 5 ft from the west with a period of 7 seconds, but the energy is weak (273) and the conditions are lumpy and choppy. The best of a bad lot? Maybe the 17th, when the swell drops to 6 ft from the west, but the wind is still cross-onshore and the waves are poor. There’s really nothing to get excited about here.
The only standout, if you can call it that, is a brief window on the 24th and 25th. On Monday the 24th, the swell builds to 7 ft from the west, with a period of 8 seconds and a combined energy of 526 – that’s a moderate, punchy swell. But the wind is a strong cross-onshore, making it messy and only for experts. The break is Nai Harn Beach (Thailand), a beach and reef setup, and it’s inconsistent. Even then, the wind is just too strong. For the average surfer, this is a kite-surfing setup, not a paddle one. The crowds are *sometimes* here, but honestly, with conditions this poor, no one will be out.
Bottom line: this is a tough 16-day forecast. The surf is poor, the wind is wrong, and the consistency is low. For most of the period, it’s a no-go. Even the bigger swells are ruined by the wind. Don’t bother checking the buoys – just wait for a better forecast.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Thu morning. Warm (max 29°C on Mon night, min 28°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 28mm), heaviest during Fri morning. Warm (max 29°C on Fri morning, min 28°C on Thu night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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 7 | W 20 | W 19 | W 18 | W 18 | W 7 | W 6 | W 7 | W 7 | W 8 | SW 15 | W 8 | W 8 | W 8 | W 7 | W 7 | W 8 | W 8 | W 8 | W 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 260 | 229 | 8 | 7 | 6 | 6 | 99 | 95 | 0 | 0 | 398 | 9 | 0 | 431 | 327 | 431 | 397 | 593 | 447 | 283 | 235 |
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 | 9:27AM1.88m | 10:04PM1.60m | 10:12AM2.01m | 10:45PM1.72m | 10:52AM2.08m | 11:23PM1.81m | 11:28AM2.08m | 11:58PM1.85m | 12:03PM2.02m | 00:31AM1.85m | 12:35PM1.90m | 1:02AM1.80m | 1:06PM1.75m | 1:33AM1.73m | |||||||
Low Tide | 3:59PM0.15m | 3:54AM0.26m | 4:40PM0.02m | 4:38AM0.17m | 5:16PM-0.06m | 5:17AM0.12m | 5:50PM-0.07m | 5:54AM0.12m | 6:21PM-0.03m | 6:30AM0.17m | 6:50PM0.06m | 7:04AM0.26m | 7:18PM0.18m | ||||||||
 |  |  | |  |  | | |  | | | | | |  | | | | | | | |
 | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:44 | — | — | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:42 | — | — | 6:40 | — |
mm | — | — | 1 | — | 1 | — | 2 | 2 | 6 | 6 | 4 | — | 3 | 1 | 6 | 2 | — | 16 | 1 | 2 | 6 |
Temp °C | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 28 | 27 | 29 | 28 |
Feels °C | 29 | 30 | 30 | 30 | 31 | 31 | 29 | 29 | 28 | 28 | 28 | 28 | 27 | 28 | 29 | 28 | 28 | 27 | 28 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | W 22 | W 21 | W 20 | W 19 | W 18 | W 18 | W 17 | W 16 | — | — | — | SW 15 | — | — | — | — | — | — | — | W 15 | SW 15 |
| kJ | 9 | 9 | 8 | 7 | 6 | 6 | 6 | 5 | — | — | — | 9 | — | — | — | — | — | — | — | 4 | 8 |
Swell 2 Height (m) Direction Period (s) | W 15 | W 15 | W 15 | W 14 | W 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 24 |
| kJ | 4 | 5 | 4 | 4 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 11 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 6 | W 7 | W 7 | W 8 | W 8 | W 8 | W 8 | W 8 | W 7 | W 7 | W 8 | W 8 | W 8 | W 7 |
| kJ | 260 | 229 | 143 | 139 | 143 | 124 | 99 | 95 | 199 | 340 | 398 | 388 | 491 | 431 | 327 | 431 | 397 | 593 | 447 | 283 | 235 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 635 | 24 | 4 | 4 | 4 | 4 | 4 | 636 | 24 | 635 | 24 | 24 | 635 | 636 | 24 | 635 | 635 | 24 | 4 | 4 | 24 |
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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