Surf Forecasts:
Nai Harn Beach surf forecast from 11 Aug 2026:
- Most powerful swell: Monday 17 Aug, 7AM (local time) - 7ft (2.2m), 8s period, W swell with 581 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 2.2m 8s and forecast to arrive on Monday (Aug 17) at 7AM. Winds are predicted to be 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 Friday (Aug 14) at 10PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Mon 17th Aug) | 7ft (2.2m) 8s |
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: Nai Harn Beach is not firing in this 16-day window. The whole run is a bit of a dud, to be honest. We’re looking at a long, drawn-out period of poor surf conditions with nothing worth paddling out for. The first few days are a total write-off, with tiny, weak swell and cross-shore winds chopping things up. Then, from Friday the 14th of August through to the end of the first week, we get a bit more size, but it’s messy.
The swell pushes up to around 6ft on the 15th and 16th, coming from the west, but the wind is a stubborn cross-onshore breeze, fresh and lumpy. The combined wave energy gets up into the moderate range (478 on the 15th afternoon), but it’s wasted on the poor conditions. The period is short, around 8 seconds, so it’s just wind-slop, not groundswell you can sink your teeth into. With the wind and poor surf quality, this setup is honestly more interesting for kite surfing than paddle surfing.
The second week doesn’t offer any salvation. We see a drop back to tiny, weak swell from the 22nd of August onwards, with the combined energy falling to trivial levels (4 to 25). The wind stays on it, so it’s just a flat, choppy mess. Nai Harn is an exposed beach and reef, but with the westerly swell direction and constant onshore flow, it’s just not working. It’s a blank run, and for this area, that’s not unusual – we’ve just got to wait for the next pattern shift.
Signing off, Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Thu night. Warm (max 29°C on Tue night, min 28°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 43mm), heaviest during Fri night. Warm (max 29°C on Sat morning, min 27°C on Sun night). Mainly strong winds. | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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 19 | W 18 | W 18 | W 17 | W 8 | W 16 | W 6 | W 7 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 7 | W 7 | W 6 | WSW 22 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7 | 6 | 6 | 6 | 5 | 5 | 187 | 358 | 420 | 420 | 454 | 0 | 410 | 362 | 491 | 545 | 424 | 294 | 235 | 233 | 45 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | 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 | cross-on | cross-on | cross-on |
High Tide | 10:12AM2.01m | 10:45PM1.72m | 10:52AM2.08m | 11:23PM1.81m | 11:28AM2.08m | 11:58PM1.85m | 12:03PM2.02m | 00:31AM1.85m | 12:35PM1.90m | 1:02AM1.80m | 1:06PM1.75m | 1:33AM1.73m | 1:36PM1.58m | 2:04AM1.62m | |||||||
Low Tide | 4:40PM0.02m | 4:38AM0.17m | 5:16PM-0.06m | 5:17AM0.12m | 5:50PM-0.07m | 5:54AM0.12m | 6:21PM-0.03m | 6:30AM0.17m | 6:50PM0.06m | 7:04AM0.26m | 7:18PM0.18m | 7:38AM0.38m | 7:44PM0.32m | ||||||||
 |  |  | | |  |  | |  | | | | |  | | | | |  | |  | |
 | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — |
mm | — | — | — | — | — | 8 | 2 | 1 | 9 | 2 | 4 | 3 | 2 | 6 | 6 | 8 | 3 | 1 | 1 | — | — |
Temp °C | 29 | 29 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 31 | 31 | 29 | 31 | 29 | 29 | 27 | 27 | 27 | 28 | 27 | 29 | 28 | 28 | 26 | 28 | 28 | 29 | 29 | 27 | 29 |
Swell 1 Height (m) Direction Period (s) | W 19 | W 18 | W 18 | W 8 | W 8 | W 16 | — | — | — | W 17 | WSW 16 | — | WSW 16 | — | — | — | W 15 | SW 15 | SW 14 | — | WSW 22 |
| kJ | 7 | 6 | 6 | 4 | 4 | 5 | — | — | — | 6 | 24 | — | 25 | — | — | — | 4 | 8 | 8 | — | 45 |
Swell 2 Height (m) Direction Period (s) | W 14 | W 14 | — | W 17 | W 16 | — | — | — | — | W 18 | — | — | — | — | — | — | — | W 24 | W 23 | — | W 13 |
| kJ | 4 | 4 | — | 6 | 5 | — | — | — | — | 6 | — | — | — | — | — | — | — | 11 | 10 | — | 4 |
Swell 3 Height (m) Direction Period (s) | W 14 | — | — | W 13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 18 |
| kJ | 4 | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 |
Wind waves Height (m) Direction Period (s) | W 7 | W 7 | W 7 | W 7 | W 7 | W 6 | W 6 | W 7 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 7 | W 7 | W 6 | W 7 |
| kJ | 103 | 120 | 103 | 72 | 72 | 95 | 187 | 358 | 420 | 420 | 454 | 388 | 410 | 362 | 491 | 545 | 424 | 294 | 235 | 233 | 135 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 24 | 636 | 4 | 4 | 4 | 24 | 782 | 601 | 635 | 635 | 635 | 4 | 635 | 636 | 635 | 635 | 4 | 635 | 4 | 635 | 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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