Surf Forecasts:
Nai Harn Beach surf forecast from 9 Sep 2026:
- Best quality surf: Sunday 13 Sep, 4PM (local time) - 1.5ft (0.4m), 19s period, WSW swell with glassy winds.
- Most powerful swell: Sunday 13 Sep, 4AM (local time) - 1.5ft (0.4m), 19s period, WSW swell with 125 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 4PM (local time) - 1.5ft (0.4m), 19s period with WSW swell.
Best Forecast Surf Conditions for Nai Harn Beach this week:
The surf forecast for Nai Harn Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 13) at 4PM. The primary swell is predicted to be 0.4m and 19s period with a secondary swell of 0.4m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Nai Harn Beach in the next 16 days are 0.4m 19s and forecast to arrive on Sunday (Sep 13) at 4AM. 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 6s period and expected on Thursday (Sep 10) at 4PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Sun 13th Sep) | 1.5ft (0.4m) 19s |
| Best Surf | 4PM (Sun 13th Sep) | 1.5ft (0.4m) 19s |
| Most Powerful | 4AM (Sun 13th Sep) | 1.5ft (0.4m) 19s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let's break down Nai Harn Beach.
Honestly, these next 16 days are looking lean for surf. The break faces into the W/WSW swell, but the wind is nearly always working against us, or the swell is just pitiful. There's a lot of stormy weather to sit through. The first week and a half you're staring at a lot of knee-high slop with cross-onshore breezes. Just a waiting game.
Water temp is about 86°, nearly 2° warmer than average for this time of year—that’s noticeable. You won't need a jacket.
Now, the first time things get interesting is around the 17th. Wednesday afternoon we see a jump to 6ft from the W, but it's a short period of 7 seconds, so it will be lumpy and weak. A cross-onshore breeze at 9 mph will mess up the face. The combined energy is moderate (308), so some push, but nothing clean.
The big spike is on Friday the 18th: a solid 10ft from the W with a 9-second period and a very strong combined energy of 1708. That is a lot of water moving, but the wind is blasting at 22 mph cross-onshore. It'll be a massive, choppy, dangerous mess— strictly for the kite crew.
Saturday the 19th is still big, dropping from 7ft to 6ft from the W, with energy around 494 to 382 (still hefty). But the wind stays on it at 19 mph cross-onshore. Not for a paddle board.
The one moment you could actually enjoy is the afternoon of Sunday the 13th. The swell is tiny, only 1ft from the WSW, but the wind drops to glassy (3 mph from the NW). The combined energy is a moderate 143, and the period is a whopping 19 seconds. That’s proper groundswell. At a beach and reef setup, that long period will try to hold its shape, offering a few clean lines, but it’s super small. You will be on a longboard, scratching, but the surface will be glass. It’s rideable, just barely.
Other than that, a big gap from the 14th through the 21st features nothing good. The 18th and 19th have the size but the wind wrecks it. So, the only real chance to get wet and get a clean wave is on the afternoon of September 13th.
Patience, mate.
Rusty.
Short Range ForecastHeavy rain (total 29mm), heaviest during Wed morning. Warm (max 29°C on Wed night, min 26°C on Fri night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 45mm), heaviest during Mon night. Warm (max 28°C on Sat afternoon, min 25°C on Sun night). Winds increasing (calm on Sun afternoon, fresh winds from the WSW by Mon afternoon). | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
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 6 | WNW 6 | WNW 6 | WSW 16 | SW 15 | WSW 15 | WSW 15 | WSW 15 | W 24 | WSW 22 | WSW 21 | WSW 20 | WSW 19 | WSW 19 | WSW 18 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | WSW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 24 | 60 | 60 | 25 | 9 | 21 | 22 | 22 | 43 | 45 | 90 | 75 | 125 | 122 | 102 | 101 | 54 | 50 | 50 | 49 | 22 |
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 | cross | cross | cross-on | cross-on | cross-on | on | glassy | cross | cross-on | on | cross-on | on | cross-on | cross |
High Tide | 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 | 12:03PM1.84m | 00:22AM1.90m | 12:31PM1.70m | 00:49AM1.81m | ||||||||
Low Tide | 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 | 6:02AM0.11m | 6:09PM0.09m | 6:32AM0.20m | 6:33PM0.20m | ||||||||
 | |  | | | | | | | | |  | | |  | | | | |  | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — | — | 6:27 | — |
mm | 4 | 3 | 4 | 2 | 2 | 4 | 2 | 4 | 4 | 3 | 5 | 7 | 5 | 5 | 4 | 3 | 1 | 12 | 4 | 8 | 5 |
Temp °C | 28 | 28 | 29 | 28 | 29 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 26 | 26 | 26 | 27 | 27 | 28 | 27 | 27 |
Feels °C | 30 | 29 | 31 | 29 | 30 | 29 | 28 | 28 | 28 | 27 | 28 | 28 | 29 | 30 | 30 | 26 | 26 | 28 | 29 | 28 | 30 |
Swell 1 Height (m) Direction Period (s) | WNW 6 | W 17 | SW 16 | WSW 16 | SW 15 | WSW 15 | WSW 15 | WSW 15 | WSW 16 | WNW 7 | WSW 21 | WNW 7 | W 7 | W 7 | WSW 18 | WSW 17 | WSW 17 | W 7 | W 7 | WNW 5 | WNW 6 |
| kJ | 58 | 6 | 10 | 25 | 9 | 21 | 22 | 22 | 25 | 62 | 90 | 49 | 35 | 35 | 102 | 101 | 54 | 9 | 8 | 7 | 30 |
Swell 2 Height (m) Direction Period (s) | W 18 | — | W 13 | — | — | — | W 26 | W 26 | W 24 | WSW 22 | WSW 16 | WSW 20 | WSW 19 | WSW 19 | S 4 | W 7 | W 7 | WSW 16 | WSW 16 | WSW 16 | WSW 15 |
| kJ | 6 | — | 3 | — | — | — | 13 | 13 | 43 | 45 | 25 | 75 | 125 | 122 | 6 | 15 | 8 | 50 | 50 | 49 | 22 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | WSW 16 | — | WSW 15 | — | SSW 4 | SW 18 | S 4 | W 8 | WSW 16 | — | WNW 8 | SE 4 |
| kJ | — | — | — | — | — | — | — | — | — | 25 | — | 21 | — | 6 | 78 | 1 | 5 | 25 | — | 13 | 1 |
Wind waves Height (m) Direction Period (s) | W 6 | WNW 6 | WNW 6 | WNW 6 | W 6 | W 6 | W 6 | W 6 | WNW 6 | W 7 | WNW 7 | W 7 | W 7 | W 7 | W 7 | W 4 | WSW 3 | WNW 4 | W 4 | — | — |
| kJ | 24 | 60 | 60 | 115 | 126 | 94 | 108 | 108 | 80 | 24 | 66 | 25 | 15 | 15 | 27 | 3 | 4 | 6 | 5 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 636 | 636 | 635 | 636 | 4 | 24 | 636 | 106 | 635 | 4 | 4 | 4 | 0 | 4 | 4 | 635 | 635 | 24 | 4 | 4 |
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)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Nai Harn Beach surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest