Surf Forecasts:
Nai Harn Beach surf forecast from 22 Aug 2026:
- Most powerful swell: Wednesday 26 Aug, 1PM (local time) - 6.5ft (2.0m), 8s period, W swell with 466 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 2.0m 8s and forecast to arrive on Wednesday (Aug 26) 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 1.8m 7s period and expected on Tuesday (Aug 25) at 10AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Wed 26th Aug) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Gotta be straight with you – this outlook for the next 16 days is a tough one. We’re looking at a long, quiet, and messy spell ahead.
Right now and for the next week, it’s honestly flat. We’re talking tiny, weak swells of 0.3 ft to 0.7 ft that are barely registering. The water is sitting at 85°, which is about average for this time of year. There’s a significant gap here with basically no surf on offer until Wednesday the 26th.
Things finally show a pulse of energy from Wednesday the 26th, but it’s not good news for the paddle surfer. A strong westerly swell fills in, jumping to 7 ft, with wave energy shooting up (454) on Wednesday morning. The problem is the wind. It’s hammering from the W at 19 mph, a nasty cross-onshore that’s going to ruin any chance of a clean wave. The period is short, at just 8 seconds, which is just sloppy windswell. This messy, choppy look continues for days. From Wednesday the 26th right through to Wednesday the 2nd of September, the swell hangs around, getting up to 8 ft and energy into the 900s, but that strong cross-shore wind never lets up. At Nai Harn Beach, a beach-and-reef setup, this is looking far more interesting for kite surfing than for a surfboard. Beginners should steer well clear of this size anyway.
By Thursday the 3rd of September, the swell collapses again, dropping back to 1.0 ft and a weak energy (51). The final days of the outlook, right through to Sunday the 6th, see more small, short-period windswell (5 ft - 5 ft) in the 7-8 second range mixed with light cross-shore breezes. It might be slightly better, but it’s hardly a standout.
This is one of those runs where you take a break. There’s simply no good window for a clean, quality surf session in this 16-day forecast.
Rusty.
Short Range ForecastHeavy rain (total 30mm), heaviest during Mon night. Warm (max 29°C on Sat afternoon, min 28°C on Sat morning). Winds increasing (calm on Sat morning, fresh winds from the W by Mon morning). | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Tue morning. Warm (max 29°C on Tue night, min 28°C on Tue morning). Mainly fresh winds. | ||||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | |||||||||||||||
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 16 | WSW 16 | WSW 16 | WSW 15 | SW 15 | W 15 | W 19 | W 15 | W 18 | W 17 | SW 16 | W 7 | W 8 | W 8 | W 15 | W 8 | W 8 | WSW 16 | W 8 | W 8 | WSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 25 | 25 | 24 | 23 | 9 | 4 | 7 | 4 | 6 | 6 | 10 | 0 | 454 | 465 | 4 | 421 | 305 | 25 | 377 | 153 | 24 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | 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-on | cross-on |
High Tide | 6:22PM1.00m | 7:14AM1.32m | 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 | ||||||||
Low Tide | 12:39PM0.83m | 11:56PM0.83m | 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 | ||||||||
 | |  |  | |  | | | |  |  | | |  | | | |  |  | | | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:38 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — |
mm | — | — | — | 1 | 2 | 7 | 6 | 3 | 11 | 10 | — | 1 | 1 | 1 | — | — | — | 3 | — | 1 | 5 |
Temp °C | 28 | 29 | 29 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 |
Feels °C | 32 | 33 | 34 | 32 | 31 | 29 | 28 | 28 | 28 | 27 | 26 | 29 | 27 | 29 | 28 | 29 | 29 | 28 | 27 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 8 | W 15 | W 15 | W 15 | W 18 | W 17 | SW 16 | — | — | — | W 15 | WSW 15 | W 8 | WSW 16 | WSW 16 | W 8 | WSW 16 |
| kJ | 131 | 133 | 133 | 105 | 111 | 4 | 4 | 4 | 6 | 6 | 10 | — | — | — | 4 | 21 | 305 | 25 | 26 | 314 | 24 |
Swell 2 Height (m) Direction Period (s) | WSW 16 | WSW 16 | WSW 16 | WSW 15 | SW 15 | — | — | — | — | — | — | — | — | — | — | — | WSW 15 | — | — | WSW 16 | — |
| kJ | 25 | 25 | 24 | 23 | 9 | — | — | — | — | — | — | — | — | — | — | — | 22 | — | — | 26 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | W 19 | — | — | — | — | — | — | — | — | — | W 21 | — | — | — | — |
| kJ | — | — | — | — | — | — | 7 | — | — | — | — | — | — | — | — | — | 9 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | W 8 | 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 | — | — | — | — | — | 172 | 196 | 205 | 220 | 312 | 287 | 312 | 454 | 465 | 368 | 421 | 149 | 299 | 377 | 153 | 314 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 645 | 24 | 617 | 641 | 636 | 635 | 635 | 24 | 24 | 24 | 24 | 24 | 24 | 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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