Surf Forecasts:
Nai Harn Beach surf forecast from 1 Sep 2026:
- Most powerful swell: Thursday 3 Sep, 4PM (local time) - 3.5ft (1.0m), 16s period, W swell with 496 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 1.0m 16s and forecast to arrive on Thursday (Sep 03) at 4PM. 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 6s period and expected on Tuesday (Sep 08) at 10PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Thu 3rd Sep) | 3.5ft (1.0m) 16s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what Nai Harn Beach has in store for us.
Right off the bat, I gotta be straight with you – it’s not looking great. We’ve got a long stretch ahead with pretty much nothing worth paddling out for. The whole 16-day window is one big gap for surf. There’s simply no recommended sessions to be found here.
The issue is a classic monsoon battle. For the first week, we’re looking at tiny, weak swell. Through Tuesday the 3rd and into the weekend, the swell is barely a ripple, mostly under 1 ft, and the combined wave energy is weak, sitting in the double digits – like 21 or 9. The wind is mostly a cross-onshore breeze, making it choppy and messy. Not even worth a longboard. This is a tough run for Nai Harn; it tends to go quiet like this for a stretch.
Moving into the second week, the swell does start to build. By Monday the 9th of September afternoon, we start seeing some size, with 5 ft swell from the west, and the energy climbs to moderate (205). Then it gets bigger, but the wind gets worse. By Thursday the 12th, we’re looking at 8 ft swell from the west with a short, 8-second period, but the cross-onshore wind is a strong 25 mph, making it lumpy and messy. (Combined energy of all swells directed here: 636). For the experts, it’s maybe interesting, but with that wind, it’s a battle.
The biggest push comes around Sunday the 15th of September, with a 10 ft west swell, but it’s accompanied by 22-25 mph cross-onshore winds. The period is short, around 9 seconds, so it’s not a clean groundswell, and with that much wind and a beach-and-reef setup, this looks way more interesting for the kite surfers than us paddle surfers. It’s just too blown out.
So, bottom line: there are no standouts here. Surfers will have to wait. For now, the board stays in the bag. Forecasts can change, but this one’s a dry spell.
- Rusty
Short Range ForecastHeavy rain (total 42mm), heaviest during Thu afternoon. Warm (max 29°C on Tue afternoon, min 27°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 23mm), heaviest during Sun night. Warm (max 28°C on Fri afternoon, min 27°C on Mon morning). Wind will be generally light. | |||||||||||||||||||
Tue 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | ||||||||||||||
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 18 | WSW 18 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | W 16 | W 6 | WSW 15 | WSW 14 | W 8 | W 14 | W 8 | W 6 | W 18 | W 17 | W 6 | W 6 | W 6 | W 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 107 | 102 | 96 | 91 | 51 | 50 | 496 | 127 | 21 | 21 | 20 | 15 | 11 | 60 | 6 | 6 | 64 | 75 | 98 | 5 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | 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 |
High Tide | 1:05AM1.88m | 1:13PM1.69m | 1:43AM1.78m | 1:53PM1.51m | 2:29AM1.64m | 2:45PM1.31m | 3:36AM1.50m | 4:19PM1.14m | 5:30AM1.42m | 6:57PM1.15m | 7:22AM1.52m | 8:23PM1.32m | ||||||||
Low Tide | 6:49PM0.07m | 7:14AM0.25m | 7:21PM0.19m | 7:57AM0.38m | 7:59PM0.35m | 8:52AM0.54m | 8:50PM0.54m | 10:24AM0.68m | 10:20PM0.70m | 12:46PM0.65m | 00:41AM0.71m | 2:13PM0.47m | 2:08AM0.56m | |||||||
 |  | | |  | | | | | |  | | | | | | | |  | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:32 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — |
mm | 2 | 3 | 4 | 5 | 2 | 5 | 8 | 8 | 5 | 3 | — | 2 | 2 | 1 | 4 | 2 | 6 | 3 | 1 | 6 |
Temp °C | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 31 | 33 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 29 | 30 | 30 | 30 | 29 | 28 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 7 | W 7 | WSW 16 | WSW 16 | W 7 | — | WSW 15 | WSW 15 | WSW 14 | W 8 | W 8 | W 8 | W 13 | W 13 | W 13 | W 16 | W 16 | W 16 | W 16 |
| kJ | 108 | 86 | 54 | 91 | 51 | 45 | — | 23 | 21 | 21 | 19 | 11 | 11 | 3 | 3 | 3 | 5 | 5 | 5 | 5 |
Swell 2 Height (m) Direction Period (s) | WSW 18 | WSW 18 | WSW 17 | — | — | WSW 16 | — | — | — | — | WSW 14 | W 14 | W 13 | — | W 18 | W 17 | W 12 | W 12 | W 12 | — |
| kJ | 107 | 102 | 96 | — | — | 50 | — | — | — | — | 20 | 15 | 3 | — | 6 | 6 | 3 | 3 | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | W 12 | W 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 8 | — | — | WNW 7 | W 7 | — | W 16 | W 6 | W 6 | W 7 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 |
| kJ | 42 | — | — | 73 | 66 | — | 496 | 127 | 109 | 104 | 79 | 64 | 64 | 60 | 76 | 74 | 64 | 75 | 98 | 94 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 4 | 635 | 635 | 635 | 4 | 797 | 4 | 4 | 636 | 4 | 4 | 4 | 97 | 4 | 4 | 635 | 635 | 636 | 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.
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