Surf Forecasts:
Nai Harn Beach surf forecast from 3 Sep 2026:
- Most powerful swell: Friday 4 Sep, 7PM (local time) - 3.5ft (1.1m), 6s period, W swell with 100 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 1.1m 6s and forecast to arrive on Friday (Sep 04) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Thursday (Sep 10) at 10PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Fri 4th Sep) | 3.5ft (1.1m) 6s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright mate, let’s talk Nai Harn Beach. I’m gonna level with ya – the next couple of weeks look pretty flat and ugly. There’s just no clean window where the wind and swell decide to play nice.
Starting off Thursday afternoon of this week, we’ve got a weak little 4ft wave from the west, with a short period of 5 seconds. The combined energy is only 133 – that’s weak. And with a fresh cross-onshore breeze at 18 mph, it’s just a lumpy mess. The water’s about 85°, which is average for the time of year.
Then we fall right off a cliff. From Friday the 4th all the way through to the morning of Friday the 11th of September, it’s barely a ripple. Knee-high slop at best, with gusty cross-onshore winds the whole time. The combined energy barely hits 60 in that whole stretch. Forget about it.
There’s a bit of a pulse around Friday the 11th and into Saturday the 12th. The swell bumps to about 5ft from the west, but with a short 7-second period, it’s weak and disorganized. The combined energy climbs to 245 and 273, which is solid, but that same fresh cross-onshore wind at 18 mph just tears it apart. Sunday the 13th is more of the same – 4ft of bumpy junk with the wind howling at 21 mph.
Honestly, with that much wind and a beach setup, it’s more interesting for the kite crew than for us paddle surfers.
Monday the 15th of September shows a 3ft west swell with a period of 9 seconds, carrying moderate energy of 205. The wind might back off a touch, but it’s still cross-onshore and choppy. The break is exposed to the west and the optimum swell direction is from the west, so that part’s good – but the wind just won’t get out of the way.
Nai Harn’s an *inconsistent* spot, so a long flat run like this isn’t that unusual around here. It might change, but right now, there’s nothing worth paddling out for.
Rusty.
Short Range ForecastHeavy rain (total 27mm), heaviest during Thu afternoon. Warm (max 28°C on Thu night, min 27°C on Thu afternoon). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 20mm), heaviest during Tue morning. Warm (max 28°C on Sun afternoon, min 27°C on Mon night). Mainly fresh winds. | |||||||||||||||||||
Thu 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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 5 | WSW 15 | WSW 15 | WSW 14 | W 6 | W 7 | W 13 | W 13 | W 18 | W 7 | W 7 | W 16 | W 16 | W 16 | W 20 | W 20 | W 18 | W 18 | SW 17 | SW 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 83 | 23 | 21 | 21 | 48 | 39 | 3 | 3 | 6 | 8 | 8 | 5 | 5 | 5 | 7 | 7 | 6 | 6 | 11 | 10 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-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 | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 9:16AM1.85m | 9:51PM1.69m | ||||||||
Low Tide | 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 | 3:42PM0.12m | 3:46AM0.24m | |||||||
 |  |  | |  |  | | |  | |  | |  | | | | | | | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — |
 | 6:32 | — | — | 6:32 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — |
mm | 10 | 9 | 5 | 3 | — | — | — | — | — | — | 1 | — | 1 | 4 | 4 | 3 | 3 | 4 | 3 | 6 |
Temp °C | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 26 | 28 | 28 | 27 | 30 | 31 | 29 | 30 | 31 | 30 | 30 | 29 | 28 | 30 | 30 | 27 | 27 | 27 | 26 | 28 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 15 | WSW 15 | WSW 14 | W 6 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 16 | W 16 | W 16 | W 20 | W 20 | W 18 | W 18 | SW 17 | SW 16 |
| kJ | 50 | 23 | 21 | 21 | 48 | 39 | 33 | 24 | 24 | 8 | 8 | 5 | 5 | 5 | 7 | 7 | 6 | 6 | 11 | 10 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | W 8 | NW 7 | W 13 | W 13 | W 13 | W 13 | W 12 | W 12 | W 12 | — | W 15 | W 15 | W 14 | — | — | — |
| kJ | — | — | — | — | 19 | 11 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | — | 4 | 4 | 4 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | WSW 14 | W 14 | — | — | W 18 | W 17 | W 16 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 20 | 15 | — | — | 6 | 6 | 5 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 5 | W 6 | W 7 | W 7 | — | — | — | — | — | WNW 6 | WNW 6 | WNW 6 | W 6 | W 6 | W 7 | W 7 | WNW 7 | WNW 7 | W 6 | W 6 |
| kJ | 83 | 182 | 145 | 124 | — | — | — | — | — | 16 | 30 | 50 | 78 | 86 | 148 | 148 | 157 | 157 | 137 | 130 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 601 | 782 | 4 | 24 | 4 | 4 | 601 | 635 | 635 | 635 | 4 | 4 | 4 | 4 | 4 | 635 | 635 | 635 | 636 | 635 |
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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