Surf Forecasts:
Nai Harn Beach surf forecast from 18 Sep 2026:
- Best quality surf: Sunday 20 Sep, 7PM (local time) - 4.5ft (1.3m), 8s period, W swell with glassy winds.
- Most powerful swell: Friday 18 Sep, 10PM (local time) - 8ft (2.5m), 8s period, W swell with 937 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 7PM (local time) - 4.5ft (1.3m), 8s period with W 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 20) at 7PM. The primary swell is predicted to be 1.3m and 8s period. 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 2.5m 8s and forecast to arrive on Friday (Sep 18) 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 2.2m 8s period and expected on Saturday (Sep 19) at 4AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Sun 20th Sep) | 4.5ft (1.3m) 8s |
| Best Surf | 7PM (Sun 20th Sep) | 4.5ft (1.3m) 8s |
| Most Powerful | 10PM (Fri 18th Sep) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
Short Range ForecastHeavy rain (total 51mm), heaviest during Fri morning. Warm (max 28°C on Fri afternoon, min 27°C on Fri morning). Winds decreasing (strong winds from the W on Fri afternoon, calm by Sun afternoon). | Days 4-6 Weather SummaryHeavy rain (total 23mm), heaviest during Tue morning. Warm (max 29°C on Mon afternoon, min 26°C on Tue afternoon). Winds increasing (calm on Mon morning, fresh winds from the W by Tue night). | ||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | |||||||||||||||
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 8 | W 8 | W 9 | W 8 | W 19 | WSW 18 | WSW 18 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WSW 14 | W 19 | W 18 | W 18 | W 16 | W 16 | W 16 | W 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 596 | 765 | 835 | 502 | 8 | 31 | 30 | 234 | 160 | 102 | 104 | 82 | 61 | 21 | 7 | 6 | 6 | 5 | 5 | 5 | 5 |
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-on | glassy | glassy | cross | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross |
High Tide | 1:54PM1.23m | 2:27AM1.40m | 2:37PM1.08m | 3:48AM1.26m | 5:54PM0.98m | 6:35AM1.27m | 8:01PM1.13m | 7:52AM1.41m | 8:38PM1.30m | 8:34AM1.57m | 9:07PM1.48m | 9:07AM1.71m | 9:35PM1.66m | ||||||||
Low Tide | 7:48PM0.63m | 9:04AM0.77m | 8:27PM0.78m | 11:46AM0.84m | 11:07PM0.89m | 1:52PM0.71m | 1:30AM0.78m | 2:31PM0.55m | 2:22AM0.62m | 3:00PM0.38m | 2:59AM0.45m | 3:26PM0.22m | 3:32AM0.30m | ||||||||
 |  |  | | | |  | |  |  | |  | | |  |  | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — | — |
 | — | 6:24 | — | — | 6:23 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — |
mm | 13 | 8 | 4 | 5 | 6 | 11 | — | 4 | — | — | — | 7 | 6 | 5 | — | 1 | 4 | — | 2 | 3 | 2 |
Temp °C | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 28 |
Feels °C | 25 | 25 | 26 | 27 | 28 | 30 | 31 | 32 | 32 | 33 | 31 | 30 | 32 | 29 | 27 | 26 | 26 | 26 | 28 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | — | — | — | W 16 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WNW 8 | W 8 | W 8 | W 8 |
| kJ | — | — | — | 5 | 428 | 339 | 260 | 234 | 160 | 102 | 104 | 82 | 61 | 66 | 63 | 84 | 105 | 109 | 108 | 86 | 84 |
Swell 2 Height (m) Direction Period (s) | — | — | — | W 20 | SW 15 | WSW 18 | WSW 18 | WSW 17 | SSE 6 | SSE 5 | WSW 16 | WSW 15 | WSW 15 | WSW 14 | W 14 | W 18 | W 18 | W 16 | W 16 | W 16 | W 16 |
| kJ | — | — | — | 8 | 8 | 31 | 30 | 29 | 17 | 5 | 25 | 22 | 21 | 21 | 4 | 6 | 6 | 5 | 5 | 5 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | W 19 | W 15 | — | — | WSW 16 | WSW 16 | SSE 5 | — | — | — | W 19 | W 14 | W 13 | W 13 | W 13 | — | — |
| kJ | — | — | — | — | 7 | 4 | — | — | 25 | 25 | 2 | — | — | — | 7 | 4 | 3 | 3 | 3 | — | — |
Wind waves Height (m) Direction Period (s) | W 8 | W 8 | W 9 | W 8 | — | SSE 3 | S 4 | SSE 5 | — | — | — | — | — | — | — | — | — | W 8 | WNW 3 | NW 3 | NW 4 |
| kJ | 596 | 765 | 835 | 502 | — | 4 | 10 | 22 | — | — | — | — | — | — | — | — | — | 66 | 4 | 4 | 16 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 635 | 636 | 636 | 636 | 24 | 4 | 8 | 20 | 0 | 0 | 4 | 4 | 4 | 24 | 635 | 635 | 636 | 635 | 4 | 106 | 635 |
Best forecast wave conditions in Phuket | |||||||||||||||||||||
Best forecast wave conditions in Thailand | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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