Surf Forecasts:
Nai Harn Beach surf forecast from 11 Jul 2026:
- Most powerful swell: Sunday 19 Jul, 7AM (local time) - 8ft (2.5m), 8s period, W swell with 891 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 2.5m 8s and forecast to arrive on Sunday (Jul 19) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 8s period and expected on Monday (Jul 13) at 4AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Sun 19th Jul) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
Alright, let’s get real about Nai Harn Beach. This is a tough one to call.
First up, don’t get your hopes up. The whole 16-day window is looking pretty grim. We’ve got a solid run of poor surf conditions with hardly any let-up. The first few days are a write-off, and honestly, it stays that way for the long haul.
Looking at the start, Sunday the 12th kicks off with a solid 7ft swell from the west, but that’s where the good news ends. The wind is a fresh cross-onshore at 22 mph, making it messy and lumpy. The combined swell energy is moderate at 483, but it’s all ruined by the wind. Monday the 13th and Tuesday the 14th are complete washouts with tiny 0.3ft swell and stormy weather. The whole of that first week is a no-go.
The only real event comes around the middle of the second week. From Saturday the 26th into Monday the 27th, we finally see a bit of a pulse. The swell is still 7ft to 7ft from the west, with a short period of 8 seconds, and the combined energy creeps up to a moderate 594-612. The wind finally swings onshore, but it’s still a fresh breeze. It’s still not clean, but it’s the best we’ll get. It’s still too big for beginners, and the onshore wind will chop it up.
For the experienced surfer, this is a one to two day window that might be worth a look, but it’s far from a standout. The constant cross-onshore wind and stormy conditions ruin the potential. Honestly, this whole stretch looks more interesting for a kite surfer than a paddle surfer. The swell is there, but the quality is just not for us.
Stay patient, keep your eyes peeled, but I wouldn’t be rearranging my schedule for this one.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Mon morning. Warm (max 29°C on Sun morning, min 28°C on Sat night). Winds decreasing (fresh winds from the W on Sat night, light winds from the WSW by Tue afternoon). | Days 4-6 Weather SummaryModerate rain (total 18mm), heaviest on Wed morning. Warm (max 29°C on Thu afternoon, min 28°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
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 7 | W 8 | W 8 | W 16 | W 8 | W 15 | W 20 | W 19 | W 18 | W 17 | W 17 | W 16 | SW 16 | WSW 16 | WSW 17 | WSW 16 | W 8 | W 7 | W 8 | W 8 | W 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 483 | 413 | 305 | 5 | 289 | 4 | 8 | 7 | 6 | 6 | 5 | 5 | 10 | 26 | 27 | 25 | 240 | 302 | 487 | 527 | 703 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | on | cross-on | on | on | glassy | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 8:34AM1.80m | 9:10PM1.46m | 9:30AM1.92m | 10:06PM1.56m | 10:19AM2.03m | 10:55PM1.65m | 11:05AM2.08m | 11:40PM1.70m | 11:47AM2.09m | 00:22AM1.71m | 12:27PM2.03m | 1:02AM1.70m | 1:05PM1.91m | 1:42AM1.66m | |||||||
Low Tide | 3:10PM0.30m | 3:02AM0.33m | 4:04PM0.16m | 3:57AM0.25m | 4:51PM0.05m | 4:45AM0.20m | 5:35PM-0.01m | 5:30AM0.18m | 6:16PM-0.02m | 6:13AM0.21m | 6:54PM0.02m | 6:54AM0.27m | 7:31PM0.10m | ||||||||
 | |  |  | | | | |  | | | | |  | | | | | | |  | |
 | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — |
mm | — | — | 2 | 5 | 2 | 3 | 4 | 1 | 2 | 6 | 2 | 3 | 3 | — | 1 | 1 | — | 2 | 1 | 1 | — |
Temp °C | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 28 |
Feels °C | 28 | 29 | 30 | 30 | 30 | 30 | 31 | 31 | 32 | 29 | 29 | 30 | 31 | 31 | 30 | 30 | 29 | 29 | 27 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | — | WSW 13 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WSW 17 | WSW 16 | WSW 16 | — | — | — | — |
| kJ | — | 17 | 305 | 323 | 289 | 247 | 323 | 241 | 203 | 229 | 270 | 253 | 253 | 219 | 27 | 25 | 25 | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | W 13 | W 12 | W 12 | SE 4 | W 20 | SSE 5 | SSE 5 | SSE 4 | SSE 5 | SSE 5 | SSE 5 | SSE 5 | SE 4 | — | — | — | — | — | — |
| kJ | — | — | 3 | 3 | 3 | 1 | 8 | 5 | 2 | 2 | 2 | 2 | 6 | 2 | 1 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | W 16 | W 16 | — | W 15 | W 14 | W 19 | W 18 | W 17 | W 17 | W 16 | SW 16 | WSW 16 | — | — | — | — | — | — | — |
| kJ | — | — | 5 | 5 | — | 4 | 4 | 7 | 6 | 6 | 5 | 5 | 10 | 26 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 7 | W 8 | — | S 3 | W 8 | — | SSE 5 | — | — | — | — | — | — | — | W 8 | W 8 | W 8 | W 7 | W 8 | W 8 | W 8 |
| kJ | 483 | 413 | — | 1 | 105 | — | 4 | — | — | — | — | — | — | — | 187 | 253 | 240 | 302 | 487 | 527 | 703 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 635 | 601 | 4 | 24 | 24 | 4 | 24 | 4 | 4 | 4 | 24 | 4 | 4 | 24 | 4 | 4 | 24 | 24 | 635 | 636 | 797 |
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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