
Surf Forecasts:
Nai Harn Beach surf forecast from 27 Jul 2026:
- Most powerful swell: Tuesday 4 Aug, 1AM (local time) - 5ft (1.6m), 8s period, W swell with 338 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 1.6m 8s and forecast to arrive on Tuesday (Aug 04) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 7s period and expected on Sunday (Aug 02) at 10AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Tue 4th Aug) | 5ft (1.6m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. I'm lookin' at the Nai Harn Beach outlook for the next couple of weeks, and honestly, it's a bit of a tough one. We're in for a long stretch of not much happening before we finally see some size roll in, but the wind is gonna be a real problem.
Right now, the water's sitting at a warm 86°, which is pretty much what you'd expect for this time of year. No surprises there.
The first week is basically a write-off. From Monday, July 27th, all the way through to Sunday, August 2nd, the surf is flat. We're talking about swell heights barely registering, with a combined wave energy so weak it's barely a whisper (values like 7 to 48). The wind is howling onshore or cross-onshore, making a mess of things. It's just not worth paddling out. You'd be better off finding a cold beer and watching the horizon.
Things start to change on Sunday afternoon, August 2nd. We get a pulse of 4ft swell from the west, but it's short-period stuff at 7 seconds, and that cross-onshore wind is still ruining it. The energy jumps to a moderate 151, but the surf is still described as poor. Monday, August 3rd, is more of the same – some waist-high waves but choppy and ugly.
The standout, and I'm using that word loosely, is looking like Tuesday, August 4th. The swell is gonna build to a solid 8ft from the west, with a period of 8 to 9 seconds. The combined wave energy is going to be strong, hitting 878 in the morning and a whopping 1154 in the afternoon. That's a lot of power, but here's the catch: the wind is onshore from the WSW and SW. This is going to make Nai Harn a real mess. For experienced surfers, there might be some heavy, lumpy, close-out barrels, but it's going to be a battle. For anyone else, it's a no-go zone. Honestly, this setup looks more interesting for kite surfing than paddle surfing.
After that, the rest of the outlook is a mixed bag of moderate to strong swell (4ft to 7ft) but with onshore winds from the WSW and SW keeping the quality poor. The energy stays moderate to strong (205 to 717), but the wind just never cleans up. The swell direction is coming from the west, which is the optimum direction for this break, but without offshore wind, it doesn't matter.
Nai Harn is an inconsistent spot, and this forecast shows exactly why. It's a long wait for some size, and when it comes, the wind is gonna be the enemy. Keep an eye on the charts, but don't hold your breath.
Rusty.
Short Range ForecastHeavy rain (total 36mm), heaviest during Wed morning. Warm (max 29°C on Mon afternoon, min 27°C on Wed morning). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 52mm), heaviest during Sat night. Warm (max 28°C on Thu afternoon, min 27°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | ||||||||||||||
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 15 | W 16 | W 16 | W 16 | W 16 | W 16 | W 15 | W 21 | W 20 | WSW 18 | WSW 18 | WSW 18 | WSW 16 | WSW 16 | WNW 6 | WSW 16 | W 7 | WSW 16 |
Wave Graph | ||||||||||||||||||||
149 | 33 | 4 | 5 | 5 | 5 | 5 | 5 | 4 | 8 | 7 | 33 | 31 | 30 | 26 | 25 | 51 | 24 | 127 | 24 | |
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 | on | cross-on | cross | cross-on | cross-on | cross-on | cross | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on |
High Tide | 9:52PM1.36m | 9:59AM1.75m | 10:26PM1.46m | 10:32AM1.85m | 10:58PM1.55m | 11:03AM1.92m | 11:28PM1.63m | 11:33AM1.95m | 11:58PM1.69m | 12:02PM1.95m | 00:29AM1.73m | 12:32PM1.91m | 1:01AM1.75m | |||||||
Low Tide | 3:37AM0.47m | 4:28PM0.31m | 4:14AM0.38m | 4:58PM0.22m | 4:47AM0.30m | 5:27PM0.14m | 5:19AM0.25m | 5:55PM0.09m | 5:51AM0.23m | 6:23PM0.07m | 6:24AM0.23m | 6:52PM0.07m | ||||||||
— | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
6:46 | — | — | 6:46 | — | — | 6:46 | — | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | |
mm | — | — | 2 | 4 | 6 | 10 | 5 | 4 | 5 | 3 | 5 | 3 | 4 | 11 | 6 | 3 | 16 | 1 | 3 | 11 |
Temp °C | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 27 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 |
Feels °C | 30 | 31 | 30 | 29 | 30 | 30 | 31 | 30 | 27 | 28 | 29 | 28 | 28 | 28 | 28 | 27 | 27 | 28 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 7 | W 12 | W 7 | W 7 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WNW 8 | WNW 9 | W 8 | W 8 | W 8 | WSW 16 | W 7 | W 7 |
149 | 92 | 3 | 131 | 131 | 121 | 135 | 98 | 105 | 105 | 82 | 86 | 87 | 108 | 88 | 86 | 32 | 24 | 127 | 92 | |
Swell 2 Height (m) Direction Period (s) | W 13 | W 12 | W 15 | W 12 | W 16 | W 16 | W 16 | SSE 3 | SSE 4 | SE 4 | W 20 | WSW 18 | WSW 18 | WSW 18 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | S 4 |
3 | 3 | 4 | 3 | 5 | 5 | 5 | 1 | 2 | 1 | 7 | 33 | 31 | 30 | 26 | 25 | 51 | 24 | 24 | 2 | |
Swell 3 Height (m) Direction Period (s) | — | W 15 | — | W 16 | W 13 | — | — | W 16 | W 15 | W 21 | W 15 | W 14 | W 14 | W 8 | — | W 20 | W 9 | — | — | WSW 16 |
— | 4 | — | 5 | 3 | — | — | 5 | 4 | 8 | 4 | 4 | 4 | 5 | — | 7 | 2 | — | — | 24 | |
Wind waves Height (m) Direction Period (s) | W 7 | W 7 | W 7 | — | — | — | SSE 2 | — | — | — | — | — | — | — | — | SW 2 | WNW 6 | W 7 | — | — |
72 | 33 | 111 | — | — | — | 1 | — | — | — | — | — | — | — | — | 1 | 48 | 173 | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 24 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 24 | 4 | 4 | 24 | 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.










