
Surf Forecasts:
Nai Harn Beach surf forecast from 23 Jul 2026:
- Most powerful swell: Tuesday 28 Jul, 10AM (local time) - 7.5ft (2.3m), 7s period, W swell with 578 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 2.3m 7s and forecast to arrive on Tuesday (Jul 28) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 8s period and expected on Wednesday (Jul 29) at 4AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Tue 28th Jul) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, Rusty here, your local surf voice. Let's talk about what's on the table for your area over the next couple of weeks.
Right now, it's a bit of a tough stretch. The forecast is showing a long run of conditions that are just not cooperating for a proper surf session. The wind is constantly onshore or cross-onshore, blowing from the west-northwest, and it's bringing in lumpy, choppy, and messy surf. The wave energy is weak, barely registering (63), and the swell is a pathetic 3 ft from the west with a short, weak period, so it's flat and blown out.
This pattern is set to continue for several days, with wind speeds staying in the 15-22 mph range, keeping things messy. The swell height does pick up around the 27th of July, climbing to 6 ft, but the wind is still cross-onshore and strong, ruining any chance of clean waves. The water temperature is a touch warmer than normal at 87°, but that's small comfort when the surf is junk.
The situation gets a bit more interesting, but not really for us. By the 29th of July, the swell energy jumps into the 400-500 range, and it hits a peak on the 3rd of August, with a hefty 10 ft swell from the west and a period of 9-10 seconds. That's a lot of water moving, with combined energy hitting 1609. But here's the kicker: the wind is howling out of the west-southwest at 28 mph, making it a strong, messy, cross-onshore nightmare. For a beach and reef setup like Nai Harn Beach, that's not surfable; it's a kite surfer's dream. The swell is too big and the wind is too strong for any kind of paddle surfing.
The best there is to offer, if you can call it that, is a fleeting moment on the 30th of July afternoon. The wind swings around to a true onshore direction, but it's still a fresh breeze. The swell is 6 ft from the west with an 8-second period, and the energy is high (590). It's still a messy, blown-out scenario, but it's the only time the wind isn't directly cross-onshore. It's a long shot, and not a standout for clean waves.
After that, the onshore winds persist, and the swell remains too big and messy for a good session. The whole 16-day window is a write-off for clean, quality surf. It's a blank run, and for this area, that's a pretty normal scenario when the monsoon kicks in. The break is inconsistent at the best of times, and right now, the conditions are just working against us.
Stay patient, keep an eye on the charts, but honestly, don't get your hopes up for this stretch.
Rusty.
Short Range ForecastHeavy rain (total 26mm), heaviest during Fri morning. Warm (max 29°C on Fri morning, min 28°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 25mm), heaviest during Tue night. Warm (max 29°C on Sun night, min 28°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | |||||||||||||||
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 5 | WNW 6 | WNW 6 | WNW 6 | W 6 | W 6 | W 6 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 8 | W 8 | W 8 | W 8 | W 8 | W 21 | W 8 | W 20 |
Wave Graph | |||||||||||||||||||||
55 | 94 | 97 | 97 | 114 | 141 | 225 | 254 | 0 | 385 | 368 | 0 | 578 | 491 | 0 | 478 | 354 | 136 | 9 | 346 | 7 | |
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-on | cross-on | cross-on | cross-on | cross-on | on | on | on |
High Tide | 6:13AM1.37m | 6:53PM1.09m | 7:35AM1.42m | 8:19PM1.15m | 8:36AM1.52m | 9:13PM1.25m | 9:22AM1.64m | 9:52PM1.36m | 9:59AM1.75m | 10:26PM1.46m | 10:32AM1.85m | 10:58PM1.55m | 11:03AM1.92m | 11:28PM1.63m | |||||||
Low Tide | 1:10PM0.75m | 00:40AM0.72m | 2:28PM0.66m | 1:59AM0.67m | 3:18PM0.54m | 2:55AM0.58m | 3:55PM0.42m | 3:37AM0.47m | 4:28PM0.31m | 4:14AM0.38m | 4:58PM0.22m | 4:47AM0.30m | 5:27PM0.14m | ||||||||
6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:46 | — | — | 6:46 | — | — | 6:46 | — | — | 6:46 | — | |
mm | 7 | 2 | 2 | 3 | 3 | 1 | 2 | 1 | — | 2 | 2 | 1 | 3 | 1 | 9 | 3 | 4 | 10 | 7 | 3 | 8 |
Temp °C | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 29 | 29 | 30 | 29 | 28 | 29 | 27 | 28 | 29 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 30 | 33 |
Swell 1 Height (m) Direction Period (s) | W 16 | W 16 | W 17 | SW 16 | WSW 15 | SW 15 | — | SW 14 | — | — | — | — | — | W 12 | — | W 16 | W 8 | W 8 | W 8 | W 8 | W 9 |
5 | 5 | 6 | 10 | 23 | 8 | — | 8 | — | — | — | — | — | 3 | — | 5 | 354 | 343 | 382 | 346 | 386 | |
Swell 2 Height (m) Direction Period (s) | W 13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 16 | W 16 | W 15 | W 21 | SSE 4 |
3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 5 | 4 | 8 | 3 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 22 | W 21 | W 15 | W 20 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 10 | 9 | 4 | 7 | |
Wind waves Height (m) Direction Period (s) | W 5 | WNW 6 | WNW 6 | WNW 6 | W 6 | W 6 | W 6 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 8 | W 8 | W 8 | W 8 | W 8 | SE 4 | SSE 4 | — |
55 | 94 | 97 | 97 | 114 | 141 | 225 | 254 | 266 | 385 | 368 | 349 | 578 | 491 | 454 | 478 | 157 | 136 | 1 | 4 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 635 | 635 | 635 | 635 | 635 | 635 | 635 | 635 | 636 | 635 | 635 | 24 | 24 | 635 | 636 | 24 | 635 | 601 | 24 | 635 | 636 |
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.










