Surf Forecasts:
Nai Harn Beach surf forecast from 13 Sep 2026:
- Most powerful swell: Friday 18 Sep, 1AM (local time) - 8ft (2.4m), 10s period, W swell with 1,048 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 2.4m 10s and forecast to arrive on Friday (Sep 18) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 9s period and expected on Saturday (Sep 19) at 10AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Fri 18th Sep) | 8ft (2.4m) 10s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's get straight into what's on offer for the next couple of weeks at Nai Harn Beach.
Honestly, it's a tough outlook for the next 16 days. We're looking at a pretty big gap with no real surf to get excited about. For the first eight days, from Sunday the 13th of September right through to Sunday the 20th, it's pretty much a write-off. The swell is tiny, barely cracking 2 feet, and when a bit of energy does show up, like on Thursday the 17th with a 5-foot swell, the wind is howling cross or cross-onshore at 22 mph, making a mess of things. The combined energy is weak, and the water temp is a touch warmer than normal at 86°. For a beach and reef setup like Nai Harn, it's just not worth paddling out.
We finally get a glimmer of hope on Monday the 21st of September. It's not a standout by any stretch, but it's the only period that's even worth a mention. The swell is still tiny, only 0.7 feet from the WSW, but the wind goes glassy. That's right, glassy conditions with a slight air, which is a major positive. The combined swell energy is weak, and the waves are described as "surfable but very ordinary." So, if you're desperate for a longboard or a foamie session to get wet, this is your window. It's the only time the conditions line up for anything remotely rideable.
After that brief moment of calm, the wind gets messy again, and we're back to tiny, weak swell and poor conditions for the rest of the week and into the next. The second week of the outlook is just as bleak, with onshore winds and no swell to speak of. There are no standouts here, just a lot of waiting for the next system.
This is a blank run for Nai Harn, and it's one of those periods where you leave the boards in the car and maybe go for a swim instead. Forecasts can change, but for now, it's a quiet stretch.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Mon night. Warm (max 28°C on Sun morning, min 27°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 78mm), heaviest during Thu night. Warm (max 28°C on Wed morning, min 25°C on Thu night). Winds increasing (light winds from the WNW on Wed morning, near gales from the W by Thu night). | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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 19 | WSW 19 | WSW 18 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 8 | W 5 | W 10 | W 7 | W 10 | W 10 | W 9 | W 8 | WSW 16 | W 19 | W 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 125 | 122 | 102 | 101 | 54 | 50 | 50 | 49 | 22 | 21 | 24 | 20 | 50 | 235 | 1048 | 876 | 685 | 829 | 24 | 8 | 638 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | on | on |
High Tide | 11:34AM1.94m | 11:55PM1.95m | 12:03PM1.84m | 00:22AM1.90m | 12:31PM1.70m | 00:49AM1.81m | 12:58PM1.55m | 1:16AM1.69m | 1:24PM1.39m | 1:47AM1.55m | 1:54PM1.23m | 2:27AM1.40m | 2:37PM1.08m | 3:48AM1.26m | |||||||
Low Tide | 5:43PM-0.00m | 6:02AM0.11m | 6:09PM0.09m | 6:32AM0.20m | 6:33PM0.20m | 7:01AM0.31m | 6:57PM0.34m | 7:32AM0.46m | 7:21PM0.48m | 8:08AM0.61m | 7:48PM0.63m | 9:04AM0.77m | 8:27PM0.78m | ||||||||
 |  |  | | | | | | | |  |  | | | | | | | |  | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:28 | — | — | 6:27 | — | — | 6:27 | — | — | 6:25 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — |
mm | — | 1 | 2 | 2 | — | 5 | 3 | 1 | 4 | 2 | — | 5 | 6 | 15 | 43 | 3 | 1 | 3 | 4 | 6 | 9 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 26 | 27 | 28 | 28 | 28 | 27 | 28 |
Feels °C | 31 | 30 | 31 | 31 | 31 | 31 | 32 | 31 | 31 | 31 | 29 | 30 | 29 | 26 | 22 | 25 | 27 | 27 | 28 | 28 | 30 |
Swell 1 Height (m) Direction Period (s) | W 7 | WSW 19 | W 6 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | W 4 | W 4 | WSW 8 | W 5 | W 10 | WSW 18 | SW 18 | WSW 17 | WSW 16 | — | WSW 16 | W 19 | W 8 |
| kJ | 22 | 122 | 13 | 101 | 54 | 50 | 50 | 49 | 1 | 3 | 24 | 20 | 50 | 33 | 12 | 29 | 25 | — | 24 | 7 | 477 |
Swell 2 Height (m) Direction Period (s) | WSW 19 | — | WSW 18 | W 7 | W 7 | W 4 | W 4 | W 4 | WSW 15 | W 8 | WSW 15 | SW 15 | W 15 | W 15 | — | — | — | — | W 20 | SW 15 | SW 18 |
| kJ | 125 | — | 102 | 15 | 3 | 2 | 1 | 1 | 22 | 5 | 21 | 8 | 5 | 4 | — | — | — | — | 8 | 8 | 12 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | S 4 | W 6 | W 6 | W 8 | WSW 15 | — | W 20 | W 19 | W 15 | — | — | — | — | W 20 | W 19 | SW 15 |
| kJ | — | — | — | — | — | 2 | 3 | 3 | 5 | 21 | — | 8 | 7 | 4 | — | — | — | — | 8 | 7 | 8 |
Wind waves Height (m) Direction Period (s) | — | W 7 | — | — | WSW 2 | SSW 4 | S 3 | — | — | — | — | W 5 | W 5 | W 7 | W 10 | W 10 | W 9 | W 8 | W 9 | W 9 | W 8 |
| kJ | — | 14 | — | — | 1 | 1 | 1 | — | — | — | — | 8 | 37 | 235 | 1048 | 876 | 685 | 829 | 1062 | 736 | 638 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 97 | 635 | 4 | 635 | 4 | 636 | 635 | 635 | 803 | 24 | 82 | 24 | 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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