Surf Forecasts:
Nai Harn Beach surf forecast from 9 Jul 2026:
- Most powerful swell: Monday 13 Jul, 4AM (local time) - 7.5ft (2.3m), 8s period, W swell with 699 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 8s and forecast to arrive on Monday (Jul 13) 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 1.8m 8s period and expected on Monday (Jul 13) at 7PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Mon 13th Jul) | 7.5ft (2.3m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
Alright folks, Rusty here. Let’s have a look at what’s on the cards for Nai Harn Beach over the next couple of weeks.
Straight up, it’s a rough patch ahead. We’ve got a whole lot of days with nothing but messy, wind-whipped conditions. The predominant wind is hammering in from the west and west-south-west, mostly as a cross-onshore, and that’s just killing any chance of a clean wave. For the first several days, from Friday the 10th right through to the end of the following week, the onshore flow is relentless. The combined wave energy starts around moderate levels (154) on Friday morning then builds, but it’s all rough and lumpy with short-period wind swell.
You’ll see some size on the Sunday the 12th, with swell heights hitting 7ft, but it’s a fresh cross-onshore breeze (22 mph) and the period is a paltry 8 seconds. That’s just a blown-out mess at a beach and reef setup like this. By Monday the 13th, we get onshore wind, which is even worse. It’s not until Tuesday the 14th afternoon that things get slightly less ugly, with a light breeze swinging around to the south-south-west. The combined energy drops to 316 (moderate) and the swell is 5ft from the west at 8 seconds. It’s still only a 1 out of 10, described as marginal at best, but it’s the only window that might be worth a paddle if you are absolutely desperate. Expect wind ripples on the face, but it could be the least messy of a bad bunch.
After that, we hit a wall of tiny surf and then another blast of strong, messy onshore winds. Thursday the 16th afternoon sees a jump back to 6ft, but the energy (312) is still a far cry from clean with a 19 mph cross-onshore. The whole second week is a repeat of this pattern: solid to strong swell energy (hitting 937 and even 1005 on the 20th of July) with wave heights up to 8ft, but every single report is “poor surf conditions” thanks to that fresh to strong cross-onshore breeze.
Honestly, with this much onshore wind and lumpy conditions, the setup at Nai Harn Beach looks more interesting for kite surfing than paddle surfing for most of this outlook. There is no standout session here. The best you can hope for is a very quiet, desperate look at that Tuesday 14th afternoon, but don’t get your hopes up. For the rest of it, save your energy and wait for the wind to change.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Fri afternoon. Warm (max 29°C on Thu night, min 28°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 32mm), heaviest during Mon morning. Warm (max 29°C on Sun night, min 28°C on Sun night). Winds decreasing (fresh winds from the WSW on Sun night, light winds from the W by Tue night). | ||||||||||||||||||||
Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | |||||||||||||||
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 7 | W 7 | W 6 | W 6 | W 6 | W 7 | W 8 | W 8 | W 8 | W 8 | W 8 | W 20 | W 8 | W 8 | W 18 | W 17 | W 17 | W 8 | SW 16 | W 7 | WSW 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 144 | 127 | 112 | 132 | 213 | 419 | 596 | 520 | 597 | 493 | 499 | 8 | 390 | 304 | 6 | 6 | 5 | 112 | 10 | 286 | 27 |
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 | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 6:14AM1.59m | 6:39PM1.31m | 7:28AM1.68m | 8:02PM1.36m | 8:34AM1.80m | 9:10PM1.46m | 9:30AM1.92m | 10:06PM1.56m | 10:19AM2.03m | 10:55PM1.65m | 11:05AM2.08m | 11:40PM1.70m | 11:47AM2.09m | 00:22AM1.71m | |||||||
Low Tide | 12:46PM0.57m | 00:45AM0.46m | 2:06PM0.45m | 1:59AM0.41m | 3:10PM0.30m | 3:02AM0.33m | 4:04PM0.16m | 3:57AM0.25m | 4:51PM0.05m | 4:45AM0.20m | 5:35PM-0.01m | 5:30AM0.18m | 6:16PM-0.02m | ||||||||
 |  |  |  | | | | |  | | | | | | | | |  | | |  | |
 | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — |
mm | — | 1 | — | — | 1 | — | — | — | 4 | 5 | 3 | 6 | 5 | 1 | — | 4 | 4 | — | 3 | 2 | 9 |
Temp °C | 29 | 29 | 29 | 29 | 28 | 28 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 28 | 28 | 29 | 28 |
Feels °C | 30 | 30 | 28 | 28 | 27 | 28 | 28 | 28 | 29 | 27 | 28 | 30 | 30 | 32 | 33 | 30 | 29 | 28 | 28 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | W 18 | SW 16 | WSW 16 | WSW 15 | — | — | — | SW 13 | — | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | SSE 5 | SSE 5 | WSW 17 |
| kJ | 6 | 11 | 25 | 21 | — | — | — | 7 | — | 493 | 499 | 392 | 390 | 304 | 260 | 266 | 260 | 273 | 2 | 2 | 27 |
Swell 2 Height (m) Direction Period (s) | W 14 | W 13 | W 13 | — | — | — | — | — | — | W 16 | — | W 20 | W 20 | W 19 | SSE 4 | SSE 5 | SSE 5 | SSE 5 | SW 16 | WSW 16 | — |
| kJ | 4 | 3 | 3 | — | — | — | — | — | — | 5 | — | 8 | 8 | 7 | 3 | 5 | 5 | 2 | 10 | 26 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | W 14 | — | W 18 | W 17 | W 17 | W 16 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | 6 | 6 | 5 | 5 | — | — | — |
Wind waves Height (m) Direction Period (s) | W 7 | W 7 | W 6 | W 6 | W 6 | W 7 | W 8 | W 8 | W 8 | — | — | — | SSE 4 | SSE 5 | — | — | — | W 8 | W 8 | W 7 | W 8 |
| kJ | 144 | 127 | 112 | 132 | 213 | 419 | 596 | 520 | 597 | — | — | — | 2 | 5 | — | — | — | 112 | 347 | 286 | 277 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 635 | 24 | 635 | 635 | 636 | 636 | 636 | 601 | 24 | 82 | 24 | 24 | 4 | 4 | 4 | 4 | 4 | 4 | 635 | 24 | 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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