Surf Forecasts:
Nai Harn Beach surf forecast from 27 Aug 2026:
- Most powerful swell: Monday 31 Aug, 7AM (local time) - 6.5ft (2.0m), 8s period, W swell with 441 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 Monday (Aug 31) at 7AM. 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 8s period and expected on Monday (Aug 31) at 1AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Mon 31st Aug) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, let’s be real with you. Usually, this time of year Nai Harn has at least a bit of pull to it, but looking at the whole 16-day window, it's a tough stretch. There’s a decent chunk of nothing happening right off the bat, and I’m not going to sugarcoat it. From the 27th through the 30th, it’s flat and messy. We’ve got some small, weak, junky swell, and the wind is all over the place, mostly cross-onshore. It’s not going to be worth paddling out unless you just want to get wet and frustrated.
Then, Monday the 31st rolls around, and things wake up a little. A west swell pushes in with a moderate 424 combined energy, and we see faces around 6ft. But, and there's always a but, the period is a short, fat 8 seconds. That, mixed with the fresh cross-onshore wind, means it’s going to be lumpy, sectiony, and hard to catch. If you’re a solid intermediate, you might snag a few, but it’s not a beginner’s day. The water's sitting at a normal 86° for this time of year, so the only thing you’ll need to worry about is the chop.
After that little pulse, it just fades back to almost nothing for a long while. Honestly, from the 1st through the 7th, it’s a whole lot of nothing. We’re talking 2ft and smaller, with periods all over the place. A lot of that is long-period, 15-18 seconds, which on a beach break like Nai Harn just means the waves are closing out straight, if they even break at all. The wind stays messy, and the energy is almost non-existent. It’s a complete blank run, which is a bummer.
We do get another little kick around the 9th, with 4ft on a 6-second period. That’s just windswell, pure and simple – short, crumbly, and again, not really what we’re after. The wind is onshore, and the overall rating is poor. I’d say for the whole window, the 31st looks like the only day with enough size to get your heart rate up, but even then, the conditions are going to fight you. It looks more like a day for the kite surfers, honestly, than for us paddle guys. Otherwise, you're just waiting and hoping the next forecast changes things. For now, it’s a quiet spell.
Rusty
Short Range ForecastHeavy rain (total 20mm), heaviest during Thu night. Warm (max 29°C on Thu morning, min 28°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 28mm), heaviest during Sun night. Warm (max 29°C on Mon night, min 27°C on Mon afternoon). Winds decreasing (fresh winds from the W on Mon afternoon, light winds from the W by Tue night). | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | W 20 | W 8 | W 8 | WSW 18 | WSW 18 | W 8 | WSW 18 | WSW 17 | WSW 16 | W 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 204 | 211 | 62 | 26 | 26 | 24 | 23 | 21 | 21 | 20 | 20 | 8 | 409 | 367 | 66 | 65 | 120 | 102 | 96 | 91 | 57 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | 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 |
High Tide | 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 | 1:13PM1.69m | 1:43AM1.78m | |||||||
Low Tide | 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 | 7:14AM0.25m | 7:21PM0.19m | ||||||||
 | |  | | | |  |  |  | | |  | | |  | | |  | | | | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — |
mm | 1 | 3 | 4 | 4 | 3 | 2 | — | — | 3 | 4 | 2 | 9 | 7 | 4 | — | — | — | 2 | 1 | 2 | 2 |
Temp °C | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 27 | 29 | 29 | 29 | 28 | 28 | 28 | 28 |
Feels °C | 30 | 29 | 30 | 32 | 32 | 32 | 29 | 28 | 30 | 27 | 26 | 27 | 27 | 25 | 30 | 30 | 31 | 30 | 30 | 29 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 15 | WSW 15 | W 7 | W 7 | W 8 | W 8 | W 8 | W 8 | WSW 15 | WSW 14 | WSW 14 | W 20 | SW 19 | WSW 19 | WSW 18 | WSW 18 | W 8 | W 8 | W 8 | WSW 16 | W 8 |
| kJ | 8 | 22 | 163 | 215 | 193 | 135 | 187 | 270 | 21 | 20 | 20 | 8 | 15 | 35 | 66 | 65 | 263 | 173 | 149 | 91 | 115 |
Swell 2 Height (m) Direction Period (s) | — | W 21 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | — | — | — | — | — | W 13 | W 13 | W 13 | WSW 18 | WSW 18 | WSW 17 | — | WSW 16 |
| kJ | — | 9 | 25 | 26 | 26 | 24 | 23 | 21 | — | — | — | — | — | 3 | 3 | 3 | 107 | 102 | 96 | — | 51 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SE 4 | W 21 | — | — | — | — | — | — | W 12 | W 12 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 1 | 9 | — | — | — | — | — | — | 3 | 3 | — | — |
Wind waves Height (m) Direction Period (s) | 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 | — | W 7 | W 8 |
| kJ | 204 | 211 | 62 | — | — | — | — | — | 229 | 320 | 299 | 378 | 409 | 367 | 299 | 291 | 120 | 60 | — | 134 | 57 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 24 | 24 | 24 | 4 | 24 | 4 | 635 | 636 | 24 | 24 | 636 | 601 | 24 | 636 | 4 | 4 | 24 | 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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