Surf Forecasts:
Nai Harn Beach surf forecast from 6 Sep 2026:
- Most powerful swell: Sunday 13 Sep, 1AM (local time) - 2.5ft (0.7m), 20s period, W swell with 384 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 0.7m 20s and forecast to arrive on Sunday (Sep 13) 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 1.7m 7s period and expected on Saturday (Sep 12) at 10AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Sun 13th Sep) | 2.5ft (0.7m) 20s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let’s be real about Nai Harn Beach for the next couple of weeks. This stretch is looking pretty grim for a proper paddle session. We’ve got a long run of poor conditions stretching from Monday, September 7th, all the way through to the middle of the month. The onshore and cross-onshore winds are just relentless, with moderate to fresh breezes kicking up chop and lumpy water. The swell energy is all over the place, but the quality is just not there for a decent ride.
We do see a bit of a spike in wave height around Wednesday, September 16th, with the swell jumping to 8ft. But don’t get too excited – that’s from a short period, 9-second swell, and the wind is a strong cross-onshore. The combined energy is strong at 929 to 1148, but that’s just raw, messy power. At that size and with those conditions, this is strictly for experts only, and honestly, it looks more like a kite-surfing setup than a clean paddle wave. It’s a no-go for the average surfer.
The only glimmer of hope, and I mean the only one, comes on Sunday, September 20th in the afternoon. The wind drops to a glassy 3 mph from the northwest, and the swell comes in at 4ft from the west with an 8-second period. The combined energy is moderate at 192, and for the first time in the whole outlook, the conditions are described as "surfable waves." The water temp is about average for the time of year. This is your best bet, but it’s not a standout. It’s a "get what you can" session. If you’re desperate for a surf, that’s the window. Any other time, the wind and chop are just going to ruin your day.
Rusty.
Short Range ForecastModerate rain (total 10mm), heaviest on Wed morning. Warm (max 28°C on Sun night, min 27°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 61mm), heaviest during Thu morning. Warm (max 28°C on Wed night, min 26°C on Fri afternoon). Mainly strong winds. | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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) | WNW 5 | WNW 5 | WNW 5 | WNW 6 | WNW 6 | WNW 6 | W 18 | W 17 | SW 16 | WSW 16 | SW 15 | WSW 15 | WSW 15 | W 7 | W 6 | WSW 22 | WSW 21 | W 20 | WSW 19 | WSW 19 | WSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 26 | 36 | 37 | 40 | 42 | 45 | 6 | 6 | 10 | 25 | 9 | 21 | 22 | 173 | 140 | 45 | 90 | 384 | 125 | 122 | 102 |
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 | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 7:22AM1.52m | 8:23PM1.32m | 8:29AM1.69m | 9:12PM1.52m | 9:16AM1.85m | 9:51PM1.69m | 9:56AM1.96m | 10:25PM1.83m | 10:31AM2.01m | 10:57PM1.92m | 11:04AM2.00m | 11:26PM1.96m | 11:34AM1.94m | 11:55PM1.95m | |||||||
Low Tide | 2:13PM0.47m | 2:08AM0.56m | 3:04PM0.28m | 3:03AM0.39m | 3:42PM0.12m | 3:46AM0.24m | 4:16PM0.01m | 4:23AM0.13m | 4:47PM-0.05m | 4:58AM0.08m | 5:16PM-0.05m | 5:30AM0.07m | 5:43PM-0.00m | ||||||||
 |  |  |  | |  | | | | | | | |  | | |  | | | | | |
 | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:28 | — |
mm | 1 | — | — | — | — | 1 | 4 | 2 | 9 | 7 | 5 | 6 | 9 | 9 | 13 | 1 | 2 | 11 | 5 | 6 | 14 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 26 | 27 | 27 | 27 | 27 | 28 |
Feels °C | 30 | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 28 | 26 | 26 | 26 | 25 | 26 | 26 | 27 | 27 | 29 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 7 | W 16 | W 20 | W 20 | W 18 | W 18 | W 17 | SW 16 | WSW 16 | SW 15 | WSW 15 | WSW 15 | WSW 15 | WSW 16 | WSW 22 | WSW 21 | W 7 | WNW 7 | WNW 7 | WNW 6 |
| kJ | 4 | 1 | 5 | 7 | 7 | 6 | 6 | 6 | 10 | 25 | 9 | 21 | 22 | 22 | 25 | 45 | 90 | 83 | 75 | 75 | 36 |
Swell 2 Height (m) Direction Period (s) | W 12 | W 12 | W 12 | W 15 | W 15 | W 14 | — | — | — | — | — | — | W 26 | W 26 | W 24 | WSW 16 | WSW 16 | WSW 20 | WSW 19 | WSW 19 | W 7 |
| kJ | 3 | 3 | 3 | 4 | 4 | 4 | — | — | — | — | — | — | 13 | 13 | 43 | 25 | 25 | 75 | 125 | 122 | 16 |
Swell 3 Height (m) Direction Period (s) | W 16 | W 16 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 16 | W 15 | — | SE 4 | WSW 18 |
| kJ | 5 | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 10 | 17 | — | 1 | 102 |
Wind waves Height (m) Direction Period (s) | WNW 5 | WNW 5 | WNW 5 | WNW 6 | WNW 6 | WNW 6 | WNW 6 | WNW 6 | WNW 6 | W 6 | W 6 | W 6 | W 7 | W 7 | W 6 | W 7 | W 7 | W 20 | — | — | — |
| kJ | 26 | 36 | 37 | 40 | 42 | 45 | 50 | 55 | 95 | 115 | 148 | 163 | 205 | 173 | 140 | 258 | 131 | 384 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 635 | 601 | 635 | 635 | 635 | 635 | 4 | 4 | 4 | 4 | 4 | 4 | 635 | 636 | 744 | 645 | 636 | 635 | 641 | 24 | 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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