
Surf Forecasts:
Nai Harn Beach surf forecast from 2 Sep 2026:
- Most powerful swell: Wednesday 9 Sep, 10PM (local time) - 6ft (1.9m), 7s period, W swell with 328 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 1.9m 7s and forecast to arrive on Wednesday (Sep 09) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 7s period and expected on Tuesday (Sep 08) at 10PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Wed 9th Sep) | 6ft (1.9m) 7s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down what Nai Harn Beach is serving up for the next couple of weeks. Gotta be honest, the start is a total bummer with messy winds and hardly any swell, but there is a little light at the end of the tunnel if you're willing to wait.
Right now, we're looking at a long skunk. From Wednesday the 2nd all the way through to the 12th of September, it's just poor. The water's a warm 85°, right where it should be for this time of year, but that's the only good thing. Winds are blowing cross-shore or cross-onshore, from 12 mph up to 25 mph, and the combined wave energy is weak to moderate, mostly under 100. The swell is tiny, well under 3 feet, coming from the west with a short, weak period. We see a spike on Tuesday the 8th afternoon with a 6ft west swell, but it's getting hammered by a 19 mph cross-onshore, making for a lumpy, blown-out mess. On a beach and reef setup like this, with that much wind, it's more of a kiteboarding day than a surf day.
Then things finally shift. Sunday the 13th of September is your best chance. The morning looks rough, but by the afternoon we get the goods. There's a 6ft west swell with a longer 9-second period, and the wind goes light offshore from the south-southwest at just 6 mph. That's smooth, clean potential. The combined swell energy is a strong 502, so there's plenty of push, but it's still in the intermediate sweet spot. The break is inconsistent, so you'll be waiting for sets, but when that offshore breeze is on it, those waves will be glassy. Just remember, crowds are possible here sometimes, so get out early. For a spot that rarely breaks well, this is the standout of the whole forecast, even if it's a week and a half away.
Monday the 14th still has some fun 5ft swell and light wind, but it's more cross-on than true offshore, so it won't be as clean. By Tuesday the 15th, it's back to strong cross-onshore winds and choppy conditions, with the swell dropping off. Late in the week we see some 3ft to 4ft west swells, but they're always getting chopped up by moderate to fresh cross-shore winds.
So, bottom line: don't bother paddling out for the next week and a half. The real window is Sunday the 13th. It's a long-range call, so don't get too attached, but if that light offshore wind sticks, Nai Harn could finally show us what it's got. Keep an eye on it.
Rusty.
Short Range ForecastHeavy rain (total 33mm), heaviest during Thu afternoon. Warm (max 28°C on Wed afternoon, min 27°C on Thu afternoon). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Tue morning. Warm (max 28°C on Sat afternoon, min 27°C on Sun night). Mainly fresh winds. | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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 | W 6 | W 6 | W 6 | WNW 6 | WSW 14 | W 6 | W 6 | W 6 | W 6 | W 7 | W 13 | W 7 | W 16 | W 16 | W 16 | W 20 | W 6 | W 18 |
Wave Graph | ||||||||||||||||||||
91 | 51 | 52 | 62 | 64 | 61 | 21 | 71 | 30 | 58 | 38 | 16 | 3 | 27 | 5 | 5 | 5 | 7 | 218 | 6 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | 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 | cross-on | cross-on | cross-on | cross-on |
High Tide | 1:43AM1.78m | 1:53PM1.51m | 2:29AM1.64m | 2:45PM1.31m | 3:36AM1.50m | 4:19PM1.14m | 5:30AM1.42m | 6:57PM1.15m | 7:22AM1.52m | 8:23PM1.32m | 8:29AM1.69m | 9:12PM1.52m | ||||||||
Low Tide | 7:21PM0.19m | 7:57AM0.38m | 7:59PM0.35m | 8:52AM0.54m | 8:50PM0.54m | 10:24AM0.68m | 10:20PM0.70m | 12:46PM0.65m | 00:41AM0.71m | 2:13PM0.47m | 2:08AM0.56m | 3:04PM0.28m | 3:03AM0.39m | |||||||
— | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
6:34 | — | — | 6:32 | — | — | 6:32 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | |
mm | 4 | 5 | 4 | 6 | 8 | 3 | 2 | — | 1 | — | — | 1 | — | 2 | 3 | 3 | 3 | 10 | 7 | 3 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 28 |
Feels °C | 29 | 29 | 29 | 27 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 28 | 28 | 27 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | W 7 | WSW 14 | WSW 14 | W 6 | W 6 | W 6 | W 7 | W 7 | WNW 7 | W 16 | W 16 | W 16 | W 20 | — | W 18 |
91 | 51 | 50 | 50 | 23 | 17 | 21 | 20 | 64 | 58 | 38 | 36 | 45 | 69 | 5 | 5 | 5 | 7 | — | 6 | |
Swell 2 Height (m) Direction Period (s) | — | — | WNW 7 | — | SW 16 | WSW 15 | — | — | W 8 | WNW 7 | S 4 | S 4 | W 8 | W 16 | W 12 | W 12 | — | W 15 | — | W 14 |
— | — | 5 | — | 10 | 21 | — | — | 10 | 4 | 3 | 1 | 1 | 5 | 3 | 3 | — | 4 | — | 4 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 14 | W 13 | W 13 | W 13 | W 13 | W 12 | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | 15 | 3 | 3 | 3 | 3 | 3 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | WNW 7 | WNW 7 | W 6 | W 6 | W 6 | WNW 6 | W 6 | W 6 | W 6 | WSW 6 | — | W 7 | — | W 7 | W 7 | W 7 | W 6 | W 6 | W 6 | W 7 |
73 | 65 | 52 | 62 | 64 | 61 | 81 | 71 | 30 | 37 | — | 16 | — | 27 | 94 | 126 | 100 | 124 | 218 | 240 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 635 | 24 | 635 | 635 | 635 | 635 | 4 | 635 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 636 | 636 | 24 | 635 |
Best forecast wave conditions in Phuket | ||||||||||||||||||||
Best forecast wave conditions in Thailand | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










