Surf Forecasts:
Nai Harn Beach surf forecast from 24 Aug 2026:
- Most powerful swell: Thursday 27 Aug, 1PM (local time) - 6ft (1.9m), 8s period, W swell with 410 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 1.9m 8s and forecast to arrive on Thursday (Aug 27) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 7s period and expected on Monday (Aug 31) at 7AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Thu 27th Aug) | 6ft (1.9m) 8s |
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 cookin’ over the next couple of weeks. I gotta be straight with you – it’s a grim stretch ahead. There’s nothing to get excited about, no standout sessions worth paddling out for. The whole 16-day window is a write-off for decent surf.
We kick things off on Monday, 24th August, and right away it’s a mess. A tiny 0.3ft west swell with a 15-second period is rollin’ in, but the combined energy is a weak (4) and it’s being hammered by a strong cross-onshore wind at 25 mph in the afternoon. That’s straight-up junky. The water temp is sittin’ at 86°, which is pretty normal for this time of year, so at least you won’t need a suit.
Tuesday the 25th isn’t any better – more cross-onshore wind, lumpy conditions, and only a flash of 5ft swell in the afternoon that’s short-period and messy. Wednesday and Thursday look similar: a bit more push with swell around 6ft to 6ft, and combined energy climbing into the moderate range (263 to 409), but that raw west swell is gettin’ chopped to bits by fresh cross-onshore breezes. It’s all poor surf conditions on paper.
From Friday the 28th onward, the swell drops off a cliff. For days we’re lookin’ at 0.7ft to 1.0ft waves, long-period but no power at all – combined energy in the single digits and twenties. The wind stays mostly cross-onshore or onshore, and it’s just a long, flat, lumpy stretch. There’s a brief pulse around Monday the 31st afternoon with 6ft and 402 combined energy, but again the wind ruins it. The first few days of September offer a little more size – 6ft to 7ft on the 1st and 2nd, with combined energy up to 511 – but it’s all cross-onshore, lumpy, and messy.
For the rest of the run into the second week, it’s back to tiny, weak, and wind-affected. Honestly, for a beach and reef setup like Nai Harn, with the wind howling cross-onshore and the swell comin’ straight from the west, this is more of a kite session than a paddle session. The break is inconsistent at the best of times, and with this forecast, you’re better off doing something else.
This is just one of those stretches where the ocean is on vacation. Forecasts can always change, but right now, there’s not a single wave worth paddling for.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Mon morning. Warm (max 28°C on Mon morning, min 27°C on Mon afternoon). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 41mm), heaviest during Thu night. Warm (max 28°C on Thu morning, min 27°C on Thu night). Mainly fresh winds. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 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 15 | W 6 | W 18 | W 17 | W 6 | W 7 | W 7 | W 7 | W 7 | W 7 | W 8 | WSW 16 | WSW 16 | WSW 16 | W 8 | WSW 15 | WSW 15 | W 8 | WSW 14 | W 7 | W 21 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4 | 232 | 6 | 6 | 162 | 173 | 263 | 278 | 302 | 389 | 378 | 25 | 26 | 26 | 58 | 23 | 22 | 76 | 20 | 108 | 8 |
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 | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 9:05PM1.26m | 9:06AM1.61m | 9:37PM1.41m | 9:39AM1.75m | 10:06PM1.55m | 10:10AM1.87m | 10:35PM1.69m | 10:38AM1.95m | 11:03PM1.80m | 11:07AM1.99m | 11:31PM1.88m | 11:37AM1.98m | 00:00AM1.93m | ||||||||
Low Tide | 3:07PM0.55m | 2:46AM0.60m | 3:37PM0.40m | 3:24AM0.46m | 4:04PM0.26m | 3:57AM0.33m | 4:31PM0.14m | 4:28AM0.22m | 4:57PM0.04m | 4:59AM0.15m | 5:23PM-0.02m | 5:31AM0.11m | 5:50PM-0.03m | ||||||||
 | |  | | |  | |  |  | | | | | |  | | | |  | |  | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:36 | — |
mm | 2 | 1 | — | 2 | 2 | 4 | 2 | — | — | 4 | 5 | 9 | 4 | 3 | 2 | 2 | 4 | 8 | 10 | 7 | 10 |
Temp °C | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 29 | 25 | 29 | 28 | 28 | 28 | 27 | 27 | 28 | 28 | 27 | 29 | 29 | 28 | 28 | 27 | 27 | 29 | 27 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | W 8 | — | W 18 | W 17 | SW 16 | W 16 | — | SW 15 | SW 15 | — | WSW 15 | WSW 16 | W 8 | W 8 | W 8 | WSW 15 | WSW 15 | W 7 | WSW 14 | W 7 | W 14 |
| kJ | 98 | — | 6 | 6 | 10 | 5 | — | 9 | 9 | — | 22 | 25 | 277 | 235 | 169 | 23 | 21 | 156 | 20 | 243 | 4 |
Swell 2 Height (m) Direction Period (s) | SE 4 | — | — | — | — | — | — | — | — | — | W 21 | SW 16 | WSW 16 | WSW 16 | WSW 16 | SSE 5 | SSE 5 | WSW 15 | — | WSW 14 | W 21 |
| kJ | 1 | — | — | — | — | — | — | — | — | — | 9 | 10 | 26 | 26 | 24 | 2 | 2 | 21 | — | 20 | 8 |
Swell 3 Height (m) Direction Period (s) | W 15 | — | W 14 | — | — | — | — | — | — | — | — | — | — | — | SSE 5 | — | WSW 15 | — | — | W 21 | — |
| kJ | 4 | — | 4 | — | — | — | — | — | — | — | — | — | — | — | 2 | — | 22 | — | — | 9 | — |
Wind waves Height (m) Direction Period (s) | — | W 6 | W 7 | W 7 | W 6 | W 7 | W 7 | W 7 | W 7 | W 7 | W 8 | W 8 | — | — | W 8 | W 8 | W 8 | W 8 | W 7 | W 7 | W 8 |
| kJ | — | 232 | 184 | 173 | 162 | 173 | 263 | 278 | 302 | 389 | 378 | 307 | — | — | 58 | 256 | 249 | 76 | 254 | 108 | 253 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 636 | 4 | 635 | 636 | 24 | 772 | 601 | 24 | 24 | 601 | 24 | 24 | 4 | 4 | 24 | 636 | 24 | 635 | 636 | 635 |
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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