Surf Forecasts:
Nai Harn Beach surf forecast from 23 Aug 2026:
- Most powerful swell: Sunday 30 Aug, 1PM (local time) - 7ft (2.2m), 8s period, W swell with 609 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 Sunday (Aug 30) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 7s period and expected on Thursday (Aug 27) at 4AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Sun 30th Aug) | 7ft (2.2m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Hey crew, Rusty here checking in on the Nai Harn Beach surf outlook. I'll level with you – the next two weeks look like a total bust. We've got a long stretch ahead with no decent waves to speak of.
Right out of the gate, August 23rd, we're looking at a flat ocean. The swell is a pathetic 0.7ft from the WSW with a long 15-second period, but the wind is cross-onshore at 6 mph, and the water is about 85°F – nothing special. The wave energy is a weak 23. It's just poor. The whole first week is the same story: thunderstorms likely, winds picking up to 18-25 mph, and the surf getting chopped to bits. There's some height coming in from the 26th onward with waves hitting 6ft to 8ft, but the wind never lets up. It's always cross-onshore or onshore and fresh. The period is short at 8-9 seconds, so it's just messy, lumpy junk. With that kind of onshore wind and a beach-and-reef setup, this is looking like a better bet for kite surfers than for us.
Come September, the swell drops off a cliff again – we're seeing 0.3ft to 1ft with nothing clean about it. The wind stays cross-onshore. There's a tiny bump on September 2nd afternoon with a 4ft west swell, but it's short-period and choppy. The rest of the run into September 7th is flat with poor conditions. There is simply no window of clean surf. Unfortunately, a blank run like this is pretty normal for this area during this season.
Keep the boards on the rack. I'm Rusty, signing off.
Short Range ForecastHeavy rain (total 33mm), heaviest during Mon morning. Warm (max 29°C on Sun afternoon, min 27°C on Mon morning). Winds increasing (light winds from the W on Sun morning, fresh winds from the W by Tue night). | Days 4-6 Weather SummaryHeavy rain (total 25mm), heaviest during Thu night. Warm (max 29°C on Fri afternoon, min 28°C on Wed morning). Mainly fresh winds. | ||||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | |||||||||||||||
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) | WSW 15 | SW 15 | W 15 | W 8 | W 15 | W 18 | W 17 | SW 16 | W 7 | W 7 | W 7 | W 7 | W 8 | W 8 | WSW 16 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 23 | 9 | 4 | 44 | 4 | 6 | 6 | 10 | 198 | 271 | 239 | 0 | 453 | 421 | 25 | 453 | 321 | 336 | 420 | 442 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | 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 | 8:21PM1.11m | 8:24AM1.46m | 9:05PM1.26m | 9:06AM1.61m | 9:37PM1.41m | 9:39AM1.75m | 10:06PM1.55m | 10:10AM1.87m | 10:35PM1.69m | 10:38AM1.95m | 11:03PM1.80m | 11:07AM1.99m | 11:31PM1.88m | ||||||||
Low Tide | 2:24PM0.71m | 1:51AM0.75m | 3:07PM0.55m | 2:46AM0.60m | 3:37PM0.40m | 3:24AM0.46m | 4:04PM0.26m | 3:57AM0.33m | 4:31PM0.14m | 4:28AM0.22m | 4:57PM0.04m | 4:59AM0.15m | 5:23PM-0.02m | ||||||||
 |  |  | | |  | | | |  | |  | | | | | | | | | | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — |
mm | — | 1 | 2 | 10 | 5 | 7 | 3 | 2 | 3 | — | — | — | 2 | 3 | 9 | 4 | 5 | 2 | 3 | 2 | 6 |
Temp °C | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 28 |
Feels °C | 31 | 32 | 31 | 29 | 28 | 29 | 28 | 28 | 28 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 26 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 15 | — | W 17 | SW 16 | W 16 | — | SW 15 | — | — | SW 16 | WSW 16 | WSW 16 | W 8 | WSW 16 | — | WSW 15 | — |
| kJ | 86 | 88 | 84 | 95 | 4 | — | 6 | 10 | 5 | — | 9 | — | — | 9 | 25 | 26 | 321 | 24 | — | 21 | — |
Swell 2 Height (m) Direction Period (s) | WSW 15 | SE 4 | SE 4 | W 15 | — | W 14 | — | — | — | — | — | — | — | — | — | WSW 16 | WSW 16 | — | — | — | — |
| kJ | 23 | 1 | 1 | 4 | — | 4 | — | — | — | — | — | — | — | — | — | 26 | 26 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SE 4 | SW 15 | W 15 | — | — | W 18 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 1 | 9 | 4 | — | — | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | W 8 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 |
| kJ | — | — | — | 44 | 124 | 199 | 195 | 200 | 198 | 271 | 239 | 340 | 453 | 421 | 346 | 453 | 134 | 336 | 420 | 442 | 388 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 635 | 636 | 636 | 635 | 636 | 636 | 635 | 24 | 4 | 635 | 4 | 4 | 635 | 635 | 601 |
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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