Surf Forecasts:
Nai Harn Beach surf forecast from 30 Aug 2026:
- Most powerful swell: Friday 4 Sep, 1AM (local time) - 5ft (1.5m), 7s period, W swell with 198 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 1.5m 7s and forecast to arrive on Friday (Sep 04) 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 1.7m 6s period and expected on Friday (Sep 04) at 7PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Fri 4th Sep) | 5ft (1.5m) 7s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's be straight with you – the next 16 days at Nai Harn Beach look pretty grim. We've got a long stretch of nothing much to get excited about.
Right now, the water's sitting at a warm 85°. The anomaly is just 1°, so the water temperature is about what you'd expect for this time of year – nothing wild there.
The whole forecast period is a flat spell. There's a tiny bump of energy on Sunday the 30th of August, with a 5ft swell from the west, but it's got a short, weak 7-second period and fresh cross-onshore winds at 19 mph. The combined energy is only 254 – that's weak. The word from the guidance is "poor surf conditions," and I'm not going to argue.
Then it's a wasteland. From Monday the 31st of August right through to Monday the 7th of September, the swell barely registers. You'll see little pulses of 0.7ft to 1ft, but with crap period and persistent cross-onshore winds, it's unrideable. The energy values are in the double digits or low triple digits, which is basically nothing. There's a 10-day gap with no real surf.
Things try to pick up a little around Thursday the 10th of September. We get a 8ft to 8ft west swell, but the period is still a short 7-8 seconds, and the wind is howling cross-onshore at 22 mph. The combined energy jumps to 553 and then 709, which is moderate, but the wind is a total mess. It's choppy, lumpy, and looks more interesting for kite surfing than paddle surfing. This swell is also over 8ft, so it's strictly for experts.
The pattern continues through the second week. There's a consistent 5ft to 7ft west swell from the 10th to the 14th of September, but it's always accompanied by onshore wind. The energy is moderate, between 400 and 631, but it never cleans up. The wind is the killer here.
Honestly, I can't in good conscience recommend a single session in this 16-day window. Nai Harn is inconsistent at the best of times, and right now it's not on. The forecasts can change, but for now, leave the boards at home.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Mon night. Warm (max 29°C on Sun afternoon, min 27°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 54mm), heaviest during Thu night. Warm (max 28°C on Wed afternoon, min 27°C on Wed night). Mainly fresh winds. | |||||||||||||||||||
Sun 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||
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 | WSW 14 | WSW 19 | W 7 | WSW 18 | WSW 18 | WSW 18 | WSW 18 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | W 6 | W 7 | WSW 15 | WSW 14 | WSW 14 | W 14 | W 8 | W 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 216 | 18 | 37 | 144 | 66 | 65 | 107 | 102 | 96 | 91 | 51 | 50 | 83 | 198 | 21 | 21 | 20 | 16 | 10 | 3 |
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 | cross | cross | cross |
High Tide | 00:00AM1.93m | 12:07PM1.93m | 00:31AM1.93m | 12:39PM1.83m | 1:05AM1.88m | 1:13PM1.69m | 1:43AM1.78m | 1:53PM1.51m | 2:29AM1.64m | 2:45PM1.31m | 3:36AM1.50m | 4:19PM1.14m | ||||||||
Low Tide | 5:50PM-0.03m | 6:03AM0.11m | 6:18PM-0.00m | 6:37AM0.15m | 6:49PM0.07m | 7:14AM0.25m | 7:21PM0.19m | 7:57AM0.38m | 7:59PM0.35m | 8:52AM0.54m | 8:50PM0.54m | 10:24AM0.68m | 10:20PM0.70m | |||||||
 |  | | |  |  | | | | |  | |  | | | | | | |  | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:32 | — | — | 6:31 | — |
mm | 1 | 3 | 1 | 3 | 4 | — | — | 5 | — | — | 10 | 6 | 9 | 15 | 5 | 5 | 2 | 2 | — | — |
Temp °C | 29 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 |
Feels °C | 29 | 30 | 29 | 29 | 30 | 30 | 30 | 30 | 29 | 28 | 29 | 28 | 27 | 28 | 28 | 27 | 30 | 30 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | WSW 14 | WSW 19 | WSW 19 | W 7 | W 8 | W 8 | W 7 | W 7 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 14 | W 7 | W 14 | W 8 | W 13 |
| kJ | 20 | 18 | 37 | 35 | 124 | 114 | 90 | 70 | 54 | 91 | 51 | 50 | 50 | 23 | 21 | 21 | 168 | 16 | 10 | 3 |
Swell 2 Height (m) Direction Period (s) | W 21 | W 20 | W 13 | W 13 | WSW 18 | WSW 18 | WSW 18 | WSW 18 | WSW 17 | — | SW 16 | — | — | — | — | — | WSW 14 | — | W 13 | — |
| kJ | 9 | 8 | 3 | 3 | 66 | 65 | 107 | 102 | 96 | — | 41 | — | — | — | — | — | 20 | — | 3 | — |
Swell 3 Height (m) Direction Period (s) | W 21 | — | — | — | W 13 | W 13 | — | W 12 | W 12 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 9 | — | — | — | 3 | 3 | — | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 7 | W 7 | W 7 | W 7 | — | — | — | — | W 8 | W 7 | W 6 | W 6 | W 6 | W 7 | W 7 | W 6 | — | W 7 | W 7 | W 7 |
| kJ | 216 | 168 | 135 | 144 | — | — | — | — | 28 | 70 | 84 | 84 | 83 | 198 | 154 | 163 | — | 89 | 70 | 70 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 24 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 24 | 636 | 4 | 636 | 24 | 635 | 636 | 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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