Surf Forecasts:
Nai Harn Beach surf forecast from 6 Aug 2026:
- Most powerful swell: Friday 7 Aug, 7AM (local time) - 7ft (2.2m), 9s period, W swell with 732 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 9s and forecast to arrive on Friday (Aug 07) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 8s period and expected on Wednesday (Aug 12) at 10PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Fri 7th Aug) | 7ft (2.2m) 9s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright crew, Rusty here, looking at the next couple of weeks for your surf.
To be straight with you, it’s a rough stretch. The swell shows up, but the wind is going to be a constant problem. We’ve got a whole lot of onshore and cross-onshore breeze, which is gonna chop up just about everything, so the surf is going to be messy and hard to ride. We're looking at a solid run of 5 to 8 feet of west swell, but it's going to be lumpy. The energy isn't weak either, sitting in a moderate range with readings like (437) and (889) early on. The water temp is 86.2°, which is right about average, maybe 1.8° warmer than usual, so you don't need a wetsuit.
The first chance to even look at a wave is this Thursday afternoon the 6th. It's not worth paddling out, though. West swell at 5.6ft with a 9-second period, but the light SW wind is onshore and conditions are just poor.
The entire stretch from the 7th through the 13th is pretty much a washout. There is swell, from 5ft up to 6.6ft, but the wind stays on it, swinging from SW to W and gusting to 22 mph, which is just not going to give you anything rideable. It's all cross-onshore and lumpy. The combined energy stays moderate, like (355) and (499), so there is power, but it's all messy. The surf quality is just poor, poor, poor.
We get a drop in swell around the 13th and 14th, down to 0.3ft with a very long 16-second period, but that's nothing, and the energy is super weak at (15) and (5). Then it picks back up again on the 14th afternoon, but again, the wind ruins it. After the 15th and through the 21st, we're back to the same story: west swell from 5.6ft to 7.9ft, but with a fresh cross-onshore breeze blowing 19-28 mph. The energy is moderate, climbing to (742) and (783) by the 19th and 20th, but it's not going to matter. This is going to be rough, choppy water, not surfable waves.
Look, there are no standouts in this whole window. There is no clean day on offer. The only thing I can say is that the swell is consistent, but it’s blowing like crazy. If you're just wanting to get thrashed, go for it, but I wouldn't even bother with a board. Honestly, with this much wind and swell, the setup looks more interesting for kite surfing than paddle surfing. This is a stretch where you just watch the charts and wait for the wind to back off.
Keep it salty.
Short Range ForecastModerate rain (total 17mm), heaviest on Fri night. Warm (max 30°C on Thu afternoon, min 28°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Sun night. Warm (max 29°C on Sun afternoon, min 28°C on Sun night). Mainly fresh winds. | |||||||||||||||||||
Thu 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | ||||||||||||||
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 9 | W 9 | W 9 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 18 |
Wave Graph  | ||||||||||||||||||||
 kJ | 425 | 607 | 593 | 351 | 310 | 350 | 326 | 298 | 346 | 275 | 329 | 494 | 418 | 427 | 477 | 428 | 372 | 320 | 290 | 6 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | 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 | 4:10AM1.54m | 4:30PM1.24m | 5:41AM1.50m | 6:30PM1.19m | 7:19AM1.58m | 8:11PM1.29m | 8:32AM1.73m | 9:16PM1.44m | 9:27AM1.88m | 10:04PM1.60m | 10:12AM2.01m | 10:45PM1.72m | ||||||||
Low Tide | 9:27PM0.44m | 10:40AM0.65m | 10:43PM0.57m | 12:34PM0.64m | 00:28AM0.61m | 2:09PM0.50m | 2:00AM0.52m | 3:12PM0.32m | 3:04AM0.39m | 3:59PM0.15m | 3:54AM0.26m | 4:40PM0.02m | ||||||||
 |  |  | |  | |  |  | | | | | |  | |  | | | | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:44 | — | — | 6:44 | — | — | 6:43 | — |
mm | — | — | 1 | 1 | 9 | 3 | — | 1 | 2 | — | 3 | 1 | — | 6 | 2 | — | — | 2 | 1 | 1 |
Temp °C | 30 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 28 |
Feels °C | 33 | 28 | 28 | 28 | 27 | 29 | 29 | 30 | 29 | 30 | 30 | 28 | 29 | 28 | 26 | 28 | 30 | 27 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | W 9 | SW 17 | W 9 | W 8 | WSW 16 | SE 5 | W 8 | W 8 | W 16 | W 16 | W 16 | W 16 | W 16 | W 16 | W 8 | W 21 | SW 20 | W 19 | W 18 | W 18 |
| kJ | 425 | 12 | 593 | 351 | 25 | 1 | 326 | 298 | 5 | 5 | 5 | 5 | 5 | 5 | 477 | 9 | 15 | 7 | 6 | 6 |
Swell 2 Height (m) Direction Period (s) | W 16 | — | WSW 16 | WSW 16 | S 5 | W 16 | SE 5 | W 16 | SW 16 | W 16 | — | — | W 16 | W 24 | W 22 | W 15 | W 15 | W 14 | W 14 | — |
| kJ | 5 | — | 26 | 25 | 1 | 5 | 1 | 5 | 10 | 5 | — | — | 5 | 11 | 9 | 5 | 4 | 4 | 4 | — |
Swell 3 Height (m) Direction Period (s) | W 19 | — | — | — | — | — | SW 17 | — | — | — | — | — | — | — | W 15 | W 15 | — | — | — | — |
| kJ | 7 | — | — | — | — | — | 11 | — | — | — | — | — | — | — | 4 | 5 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | W 9 | WSW 9 | WSW 8 | W 8 | W 8 | — | WSW 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WSW 8 | W 8 | W 8 | W 8 | W 8 | W 8 |
| kJ | — | 607 | 270 | 154 | 310 | 350 | — | 118 | 346 | 275 | 329 | 494 | 418 | 427 | 202 | 428 | 372 | 320 | 290 | 229 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 601 | 82 | 601 | 24 | 24 | 24 | 4 | 24 | 4 | 24 | 635 | 601 | 635 | 635 | 601 | 24 | 635 | 24 | 4 |
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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