Surf Forecasts:
Nai Harn Beach surf forecast from 28 Aug 2026:
- Most powerful swell: Monday 31 Aug, 1PM (local time) - 5.5ft (1.7m), 7s period, W swell with 286 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 1.7m 7s and forecast to arrive on Monday (Aug 31) 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 1.6m 8s period and expected on Saturday (Aug 29) at 1PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Mon 31st Aug) | 5.5ft (1.7m) 7s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about the next couple of weeks at Nai Harn Beach.
Truth is, the outlook for Nai Harn Beach over the next 16 days is a long, flat, and messy stretch. There’s genuinely nothing to get excited about for surfers. The first recommendation doesn’t come until Friday, August 30th, and even then, it’s not a good one—just a pulse of weak, short-period swell that arrives with strong cross-onshore winds, making for lumpy, poor conditions. From that point, we’ve got a real dry spell. There are days on end with no decent surf at all—just tiny ripples and onshore chop. You’ll see a bit more energy pop up around Monday, September 2nd, but with cross-onshore winds and short, weak swell, it’s still not worth paddling out for.
The only real spike in size hits around Saturday, September 12th, nearly two weeks out. That brings a 7ft swell from the west with a period of just 8 seconds—so it’s short-period, junky stuff. The combined wave energy climbs into the strong range (486), but here’s the catch: the wind is a fresh to strong cross-onshore, and the surf quality remains poor. At that size, with that wind and a beach-and-reef setup, this looks more interesting for kite surfing than paddle surfing, honestly. It’s not beginner-friendly at over 5ft, and even for experts it’ll be a battle in those messy, choppy conditions.
The water temperature is sitting at 86°F, which is about average for this time of year—nothing unusual there.
Overall, this is a tough run. Consistent surf isn’t on the cards here, and with few breaks in the area that are reliable, this kind of blank spell is more normal for Nai Harn. Keep an eye on it—forecasts can shift—but right now, leave the board at home.
Rusty
Short Range ForecastHeavy rain (total 24mm), heaviest during Mon morning. Warm (max 29°C on Fri afternoon, min 28°C on Fri night). Winds increasing (light winds from the SW on Fri afternoon, fresh winds from the W by Mon morning). | Days 5-7 Weather SummaryHeavy rain (total 29mm), heaviest during Mon afternoon. Warm (max 29°C on Wed afternoon, min 26°C on Mon afternoon). Mainly fresh winds. | |||||||||||||||||||
Fri 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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 15 | WSW 15 | WSW 15 | WSW 14 | W 7 | W 14 | W 7 | W 7 | WSW 18 | WSW 18 | WSW 18 | WSW 18 | WSW 17 | WSW 16 | WSW 16 | W 7 | W 7 | WSW 15 |
Wave Graph  | ||||||||||||||||||||
 kJ | 26 | 24 | 23 | 21 | 21 | 20 | 242 | 15 | 270 | 253 | 66 | 65 | 107 | 102 | 96 | 91 | 51 | 173 | 173 | 23 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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 | cross-on | cross-on |
High Tide | 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 | 1:13PM1.69m | 1:43AM1.78m | 1:53PM1.51m | 2:29AM1.64m | |||||||
Low Tide | 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 | 7:14AM0.25m | 7:21PM0.19m | 7:57AM0.38m | 7:59PM0.35m | |||||||
 |  |  |  | | | |  | |  | | | | | | |  | | | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:37 | — | — | 6:36 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — |
mm | 3 | 4 | — | — | 1 | 2 | 1 | 7 | 6 | 6 | 8 | 3 | 1 | 1 | 2 | — | 4 | 4 | 4 | 8 |
Temp °C | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 28 |
Feels °C | 32 | 31 | 29 | 29 | 29 | 28 | 29 | 29 | 27 | 25 | 29 | 28 | 27 | 29 | 27 | 29 | 29 | 29 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 7 | WSW 15 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | W 14 | SW 19 | WSW 19 | WSW 18 | WSW 18 | WSW 18 | WSW 18 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 |
| kJ | 223 | 156 | 23 | 21 | 21 | 20 | 20 | 15 | 15 | 35 | 66 | 65 | 107 | 102 | 96 | 91 | 51 | 50 | 50 | 23 |
Swell 2 Height (m) Direction Period (s) | WSW 16 | WSW 16 | SE 4 | SE 4 | — | — | W 21 | W 20 | — | W 13 | W 13 | W 13 | — | W 12 | W 12 | — | — | — | — | — |
| kJ | 26 | 24 | 1 | 1 | — | — | 9 | 8 | — | 3 | 3 | 3 | — | 3 | 3 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | W 7 | W 8 | W 8 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 |
| kJ | — | — | 212 | 291 | 223 | 276 | 242 | 212 | 270 | 253 | 200 | 217 | 189 | 139 | 179 | 184 | 159 | 173 | 173 | 134 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 4 | 24 | 24 | 4 | 24 | 636 | 4 | 24 | 636 | 4 | 4 | 4 | 4 | 24 | 635 | 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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