Surf Forecasts:
Nai Harn Beach surf forecast from 26 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 10PM (local time) - 1.5ft (0.4m), 18s period, WSW swell with glassy winds.
- Most powerful swell: Monday 31 Aug, 4AM (local time) - 6.5ft (2.0m), 8s period, W swell with 502 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 10PM (local time) - 1.5ft (0.4m), 18s period with WSW swell.
Best Forecast Surf Conditions for Nai Harn Beach this week:
The surf forecast for Nai Harn Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 01) at 10PM. The primary swell is predicted to be 0.4m and 18s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Nai Harn Beach in the next 16 days are 2.0m 8s and forecast to arrive on Monday (Aug 31) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 8s period and expected on Sunday (Aug 30) at 4AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Tue 1st Sep) | 1.5ft (0.4m) 18s |
| Best Surf | 10PM (Tue 1st Sep) | 1.5ft (0.4m) 18s |
| Most Powerful | 4AM (Mon 31st Aug) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
G'day, Rusty here. Look, I've got to be straight with you—this is a tough one for our shores. For the entire 16-day outlook, there's just no decent surf on offer. We're looking at a long stretch of poor conditions, so don't plan a session around any of this.
The water temp at Nai Harn Beach is sitting at 86°, which is a touch warmer than usual for this time of year, but that's about the only good news.
We start off on Wednesday, 26th August with some swell around 6 ft out of the west, but it's short-period stuff at 7 seconds and the wind is a fresh cross-onshore 19 mph, making it lumpy and messy. That sets the tone for the next few days. Thursday is more of the same, and by Friday the swell drops right off to tiny 0.7 ft, though we do see a long-period 16-second groundswell—but with no size and cross-onshore wind, it's a non-starter.
The weekend of August 30th and 31st actually sees a bump in swell height, hitting 7 ft on the Sunday morning and Monday morning, with combined wave energy reaching strong levels (510 and 517 respectively). But the wind is a fresh 19 mph cross-onshore every time, and the period is short at 8 seconds, so it's just a lumpy, blown-out mess. That's more kite-surfing territory, not paddle surfing.
Through the first week of September, the swell fades in and out, but we get a mix of tiny waves and persistent cross-onshore winds. The long-period swells that pop up (15-18 seconds) look promising on paper, but without size and with onshore winds, they just don't deliver. By the second week, from September 5th onward, it's all but flat—swell heights dropping to 0.3 ft, and the wind keeps blowing cross-onshore. Even the occasional 16-second groundswell on the 7th is only 0.3 ft, so forget it.
The last few days, September 9th and 10th, see a bit of 2 ft to 2 ft swell, but the wind is strong and gusty, up to 25 mph, making it a total write-off.
So, plain and simple: there's nothing to chase here. Nai Harn Beach is inconsistent, and this blank run is a bit more normal for the area. Hang tight, and check back in a few days—forecasts can change, but right now, stay dry.
Rusty.
Short Range ForecastModerate rain (total 19mm), heaviest on Thu afternoon. Warm (max 28°C on Wed morning, min 27°C on Fri night). Mainly strong winds. | Days 4-6 Weather SummaryHeavy rain (total 26mm), heaviest during Sat morning. Warm (max 29°C on Sun night, min 27°C on Sat morning). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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 7 | W 7 | W 7 | W 7 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 15 | W 8 | W 14 | W 20 | W 8 | W 8 | W 8 | WSW 18 | WSW 18 | WSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 263 | 239 | 216 | 246 | 261 | 242 | 26 | 26 | 24 | 23 | 22 | 21 | 420 | 16 | 16 | 442 | 407 | 133 | 64 | 107 | 102 |
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 | on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 10:06PM1.55m | 10:10AM1.87m | 10:35PM1.69m | 10:38AM1.95m | 11:03PM1.80m | 11:07AM1.99m | 11:31PM1.88m | 11:37AM1.98m | 00:00AM1.93m | 12:07PM1.93m | 00:31AM1.93m | 12:39PM1.83m | 1:05AM1.88m | ||||||||
Low Tide | 4:04PM0.26m | 3:57AM0.33m | 4:31PM0.14m | 4:28AM0.22m | 4:57PM0.04m | 4:59AM0.15m | 5:23PM-0.02m | 5:31AM0.11m | 5:50PM-0.03m | 6:03AM0.11m | 6:18PM-0.00m | 6:37AM0.15m | 6:49PM0.07m | ||||||||
 |  |  |  | |  | |  | | | |  | | | | | | | |  |  | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — |
mm | 1 | — | — | 1 | 9 | 5 | 1 | — | 2 | 3 | 3 | 4 | 2 | — | 5 | 4 | 1 | 4 | 1 | — | — |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 29 | 29 | 28 |
Feels °C | 28 | 28 | 29 | 28 | 27 | 29 | 28 | 29 | 31 | 25 | 26 | 27 | 26 | 26 | 28 | 29 | 28 | 29 | 31 | 31 | 32 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | SW 15 | WSW 15 | WSW 16 | W 8 | W 8 | W 8 | W 8 | WSW 15 | WSW 15 | WSW 14 | W 14 | W 20 | WSW 19 | WSW 19 | W 8 | WSW 18 | W 8 | W 8 |
| kJ | 10 | 9 | 9 | 8 | 22 | 25 | 259 | 193 | 160 | 266 | 21 | 21 | 20 | 16 | 8 | 37 | 35 | 331 | 64 | 277 | 186 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | W 21 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | SSE 4 | SE 5 | SW 14 | W 21 | SW 20 | W 13 | W 13 | WSW 18 | W 13 | WSW 18 | WSW 18 |
| kJ | — | — | — | — | 9 | 25 | 26 | 26 | 24 | 23 | 2 | 1 | 8 | 9 | 16 | 4 | 4 | 66 | 3 | 107 | 102 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SE 4 | WSW 15 | — | — | W 21 | — | — | — | W 13 | — | — | W 12 |
| kJ | — | — | — | — | — | — | — | — | — | 1 | 22 | — | — | 9 | — | — | — | 3 | — | — | 3 |
Wind waves Height (m) Direction Period (s) | 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 | W 8 | — |
| kJ | 263 | 239 | 216 | 246 | 261 | 242 | — | — | — | — | 287 | 386 | 420 | 408 | 466 | 442 | 407 | 133 | 307 | 100 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 635 | 601 | 24 | 24 | 601 | 4 | 4 | 4 | 4 | 635 | 24 | 4 | 635 | 636 | 635 | 24 | 4 | 4 | 4 | 4 | 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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