Surf Forecasts:
Nai Harn Beach surf forecast from 5 Aug 2026:
- Most powerful swell: Saturday 8 Aug, 4AM (local time) - 7ft (2.1m), 8s period, W swell with 603 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 2.1m 8s and forecast to arrive on Saturday (Aug 08) 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 0.2m 4s period and expected on Friday (Aug 07) at 7PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Sat 8th Aug) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get straight into it for Nai Harn Beach.
Truth is, the next 16 days look like a write-off for proper surfing. From Wednesday the 5th of August right through to Thursday the 20th of August, every single session is labeled as poor surf conditions. There’s no stand-out window, no hidden gem – just a long stretch of lumpy, messy, and blown-out conditions.
The water temp is sitting at about 86°, which is pretty normal for this time of year, so no surprises there.
Swell is hanging around 5ft to 8ft, coming from the W or WSW, with a short period of just 8 seconds. That’s weak, windswell energy – you can feel it in the numbers, with the combined energy bouncing between 135 and 789. Even the highest readings (like 789 on the 20th) are backed by a near gale cross-onshore wind, so it’s not surfable. The wind is onshore or cross-onshore the whole time, often 19 to 31 mph. That’s what’s killing it.
Nai Harn Beach is a beach and reef setup, inconsistent at the best of times, and with this constant cross-onshore breeze, it’s more of a kite surfing show than a paddle surf spot. The swell direction is from the W, but the optimum direction for this break is from the W, so that’s not the problem – it’s the wind and the short period.
There’s no point picking a “best” day here. Nothing stands out. If you’re desperate, the least bad might be Thursday the 13th of August afternoon when the swell drops to 5ft and the energy is down to 233, but it’s still cross-onshore and lumpy. That’s a hard pass from me.
Bottom line: leave the board at home for the next two weeks. Forecasts can change, but right now, Nai Harn is not worth the paddle.
Rusty.
Short Range ForecastHeavy rain (total 32mm), heaviest during Fri night. Warm (max 29°C on Wed afternoon, min 28°C on Wed night). Mainly strong winds. | Days 5-7 Weather SummaryModerate rain (total 15mm), heaviest on Sat afternoon. Warm (max 29°C on Sun morning, min 28°C on Sat afternoon). Mainly strong winds. | |||||||||||||||||||
Wed 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | ||||||||||||||
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) | WSW 8 | WSW 9 | W 8 | W 9 | W 9 | 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 | W 8 | W 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 645 | 505 | 524 | 425 | 377 | 454 | 317 | 526 | 439 | 393 | 373 | 428 | 339 | 381 | 477 | 338 | 338 | 392 | 347 | 338 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross-on | on | 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 |
High Tide | 3:05AM1.62m | 3:12PM1.40m | 4:10AM1.54m | 4:30PM1.24m | 5:41AM1.50m | 6:30PM1.19m | 7:19AM1.58m | 8:11PM1.29m | 8:32AM1.73m | 9:16PM1.44m | 9:27AM1.88m | 10:04PM1.60m | ||||||||
Low Tide | 8:36PM0.30m | 9:18AM0.55m | 9:27PM0.44m | 10:40AM0.65m | 10:43PM0.57m | 12:34PM0.64m | 00:28AM0.61m | 2:09PM0.50m | 2:00AM0.52m | 3:12PM0.32m | 3:04AM0.39m | 3:59PM0.15m | 3:54AM0.26m | |||||||
 |  | |  |  | | | | | | | | | | |  | | | | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:44 | — | — | 6:44 | — |
mm | 3 | 7 | 1 | — | 1 | 3 | 2 | 11 | 4 | 4 | 5 | — | 2 | 1 | — | — | 3 | — | — | 1 |
Temp °C | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 29 | 29 | 29 | 29 | 28 | 26 | 28 | 27 | 26 | 26 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 16 | W 8 | W 9 | W 9 | W 8 | W 8 | SE 4 | W 16 | W 17 | W 8 | W 8 | W 8 | W 16 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 |
| kJ | 26 | 26 | 524 | 425 | 377 | 454 | 317 | 1 | 5 | 6 | 373 | 428 | 339 | 5 | 477 | 338 | 338 | 392 | 347 | 338 |
Swell 2 Height (m) Direction Period (s) | — | — | W 16 | SW 16 | WSW 17 | WSW 16 | WSW 16 | — | SW 16 | SE 4 | W 16 | W 16 | W 16 | — | W 16 | W 16 | W 16 | W 22 | W 21 | SW 20 |
| kJ | — | — | 5 | 10 | 30 | 26 | 25 | — | 10 | 1 | 5 | 5 | 5 | — | 5 | 5 | 5 | 9 | 9 | 15 |
Swell 3 Height (m) Direction Period (s) | — | — | W 19 | W 19 | — | — | SW 16 | — | — | SW 16 | SW 16 | — | — | — | — | — | W 24 | W 15 | W 15 | W 15 |
| kJ | — | — | 7 | 7 | — | — | 10 | — | — | 11 | 10 | — | — | — | — | — | 11 | 4 | 5 | 4 |
Wind waves Height (m) Direction Period (s) | WSW 8 | WSW 9 | WSW 9 | — | W 9 | — | SE 4 | W 8 | W 8 | W 8 | W 8 | — | W 8 | W 8 | W 8 | — | — | — | — | W 8 |
| kJ | 645 | 505 | 193 | — | 158 | — | 1 | 526 | 439 | 393 | 140 | — | 137 | 381 | 195 | — | — | — | — | 133 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 601 | 82 | 82 | 688 | 797 | 782 | 601 | 782 | 782 | 601 | 782 | 635 | 82 | 82 | 635 | 601 | 635 | 635 | 601 | 24 |
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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