Surf Forecasts:
Nai Harn Beach surf forecast from 29 Jul 2026:
- Best quality surf: Tuesday 4 Aug, 4PM (local time) - 5.5ft (1.7m), 9s period, W swell with glassy winds.
- Most powerful swell: Wednesday 5 Aug, 10AM (local time) - 7ft (2.2m), 11s period, WSW swell with 1,027 kJ wave energy.
- Next surfable swell (1★+): Tuesday 4 Aug, 4AM (local time) - 3ft (0.9m), 7s 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 Tuesday (Aug 04) at 4AM. The primary swell is predicted to be 0.9m and 7s 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 2.2m 11s and forecast to arrive on Wednesday (Aug 05) 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 0.9m 8s period and expected on Thursday (Jul 30) at 7AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Tue 4th Aug) | 3ft (0.9m) 7s |
| Best Surf | 4PM (Tue 4th Aug) | 5.5ft (1.7m) 9s |
| Most Powerful | 10AM (Wed 5th Aug) | 7ft (2.2m) 11s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, let’s talk about the next stretch at Nai Harn Beach.
Honestly, for the first week-plus, it’s a total dud. From now through the morning of Tuesday, August 4th, you’re looking at flat, choppy, junk — nothing to get out of bed for. The combined energy is barely a whisper, sitting in the single-digit range for days (4 to 35).
But finally, on the afternoon of Tuesday, August 4th, we see a pulse of life. A 6ft west swell pushes through, and the wind goes glassy. That’s right, glassy. You can’t ask for better. The combined swell energy hits a solid 508, which is a moderate, fun-sized push. It’s a 9-second wind swell, so not a groundswell, but the clean face will make up for it for an intermediate surfer. Water temp is about normal for the time of year.
The one catch: Nai Harn is inconsistent, and when it grooms up like this, you can bet the crowd will be in the water. That Tuesday afternoon window is the standout, no contest.
The rest of the forecast is a battle with the wind. On Wednesday the 5th, the swell bumps up to 7ft with strong energy (1027), but a stiff onshore messes it up. By Friday August 7th, the westerly wind cranks to 25 mph or more, and the surf turns into a choppy, blown-out mess. With that much swell and those winds at a beach and reef setup, the kite surfers will be having a field day, but for a paddle surfer, it’s not worth it.
From the 9th through the 14th, it’s a repeat — solid swell from the west in the 5ft to 8ft range, but the wind is howling onshore at 25-35 mph, ruining every session. Then it drops back to knee-high junk by the 13th.
So, bottom line: nail that Tuesday afternoon glass-off on August 4th at Nai Harn Beach. That’s your one and only real shot.
Rusty.
Short Range ForecastHeavy rain (total 43mm), heaviest during Sat afternoon. Warm (max 29°C on Wed night, min 27°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 23mm), heaviest during Mon night. Warm (max 29°C on Mon night, min 27°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | |||||||||||||||
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 15 | W 21 | W 20 | WSW 18 | WSW 18 | WSW 18 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 16 | WSW 16 | WSW 15 | W 7 | W 8 | W 9 | W 10 | WSW 11 | WSW 8 | WSW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4 | 8 | 7 | 33 | 31 | 30 | 26 | 25 | 51 | 24 | 23 | 24 | 24 | 22 | 78 | 196 | 502 | 739 | 1027 | 547 | 639 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | on | cross-on | cross-on | glassy | on | cross-on | on | on |
High Tide | 11:03AM1.92m | 11:28PM1.63m | 11:33AM1.95m | 11:58PM1.69m | 12:02PM1.95m | 00:29AM1.73m | 12:32PM1.91m | 1:01AM1.75m | 1:04PM1.83m | 1:37AM1.74m | 1:39PM1.71m | 2:16AM1.69m | 2:20PM1.57m | 3:05AM1.62m | |||||||
Low Tide | 4:47AM0.30m | 5:27PM0.14m | 5:19AM0.25m | 5:55PM0.09m | 5:51AM0.23m | 6:23PM0.07m | 6:24AM0.23m | 6:52PM0.07m | 6:59AM0.27m | 7:22PM0.11m | 7:37AM0.34m | 7:56PM0.19m | 8:22AM0.44m | 8:36PM0.30m | |||||||
 | |  | |  |  | | | | |  | | | | | | |  | | | | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — |
mm | 5 | 4 | 5 | 4 | — | 9 | 5 | 6 | 8 | 1 | — | 2 | 4 | — | 5 | 3 | — | — | 2 | 1 | 5 |
Temp °C | 28 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 29 | 28 |
Feels °C | 30 | 31 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 30 | 30 | 29 | 31 | 32 | 31 | 32 | 31 | 30 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WNW 6 | WNW 7 | W 7 | W 7 | W 8 | W 9 | — | SE 4 | SE 4 | — |
| kJ | 103 | 105 | 84 | 88 | 86 | 61 | 66 | 48 | 44 | 41 | 60 | 30 | 62 | 61 | 78 | 196 | 502 | — | 1 | 1 | — |
Swell 2 Height (m) Direction Period (s) | — | — | W 20 | WSW 18 | WSW 18 | WNW 9 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | W 8 | WSW 16 | WSW 15 | SSE 4 | — | W 17 | SSE 4 | — | — | — |
| kJ | — | — | 7 | 33 | 31 | 17 | 26 | 25 | 51 | 24 | 23 | 12 | 24 | 22 | 2 | — | 6 | 2 | — | — | — |
Swell 3 Height (m) Direction Period (s) | W 15 | W 21 | — | — | W 14 | WSW 18 | — | — | — | W 8 | — | WSW 16 | W 8 | W 20 | W 15 | W 18 | — | — | — | — | — |
| kJ | 4 | 8 | — | — | 4 | 30 | — | — | — | 1 | — | 24 | 1 | 7 | 4 | 6 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | WSW 2 | — | — | — | — | — | SSE 5 | — | — | — | W 10 | WSW 11 | WSW 8 | WSW 8 |
| kJ | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 2 | — | — | — | 739 | 1027 | 547 | 639 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 0 | 4 | 24 | 24 | 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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