Surf Forecasts:
Nai Harn Beach surf forecast from 12 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 10PM (local time) - 7.5ft (2.3m), 11s period, W swell with 1,327 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 11s and forecast to arrive on Thursday (Sep 17) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Thursday (Sep 17) at 4PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Thu 17th Sep) | 7.5ft (2.3m) 11s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Right then. I’ve had a look at what’s coming up for Nai Harn Beach (Phuket), and to be honest, it’s a pretty grim stretch ahead. The whole 16-day window is a write-off for decent waves. There are no good surf options on offer at all. The spot itself is inconsistent at the best of times, and this run is looking like one of those blank spells the area can throw at you.
The water temp is about average for this time of year, nothing unusual there, but that’s about the only thing that’s normal.
Starting from September 12th, you’ve got a long, painful gap. For the first week, through to the 18th, it’s all tiny, weak slop. Swell heights barely crack 1ft, with a westerly direction, and periods are all over the shop but generally short and weak. The wind is mostly a messy cross-onshore, and the wave energy is pitiful, often below 100 (70-155 range). It’s just poor surf conditions, day after day. Not a single thing to get excited about.
There is a little pulse that shows up around September 17th, with the swell picking up to 7ft from the west on Thursday afternoon, and the energy jumps to 727 (moderate). But here’s the kicker – the wind is a fresh cross-shore, the period is a weak 9 seconds, and the quality is still described as “poor surf conditions.” With that much wind and a short-period windswell, the beach and reef setup is going to be a lumpy, choppy mess. Honestly, that’s more of a kite-surfing day than a paddle-surfing day for most. For the experts, maybe there's something there if they’re desperate, but it’s not one I’d recommend.
After that little spike, it drops back to tiny, pathetic waves again. The morning of September 23rd sees another jump to 7ft from the west, with 541 energy, but again it’s poor quality with onshore wind. The next few days are just tiny leftovers and glassy flat spells with zero energy.
So, the bottom line: don’t waste your time. There’s nothing worthwhile in the next 16 days. No standouts, no hidden gems. It’s a rare poor run, but forecasts can change, so keep an eye on it.
Rusty.
Short Range ForecastModerate rain (total 19mm), heaviest on Mon morning. Warm (max 28°C on Sat morning, min 27°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 129mm), heaviest during Thu night. Warm (max 28°C on Tue morning, min 25°C on Thu night). Winds increasing (light winds from the W on Tue night, strong winds from the NW by Thu night). | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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) | WSW 22 | WSW 21 | WSW 20 | WSW 19 | WSW 19 | WSW 18 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 15 | WSW 15 | W 11 | W 7 | W 11 | W 8 | W 8 | W 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 45 | 90 | 75 | 125 | 122 | 102 | 101 | 54 | 50 | 50 | 49 | 22 | 21 | 21 | 21 | 91 | 0 | 1030 | 531 | 421 | 421 |
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 | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross-on | cross-on |
High Tide | 11:04AM2.00m | 11:26PM1.96m | 11:34AM1.94m | 11:55PM1.95m | 12:03PM1.84m | 00:22AM1.90m | 12:31PM1.70m | 00:49AM1.81m | 12:58PM1.55m | 1:16AM1.69m | 1:24PM1.39m | 1:47AM1.55m | 1:54PM1.23m | 2:27AM1.40m | |||||||
Low Tide | 5:16PM-0.05m | 5:30AM0.07m | 5:43PM-0.00m | 6:02AM0.11m | 6:09PM0.09m | 6:32AM0.20m | 6:33PM0.20m | 7:01AM0.31m | 6:57PM0.34m | 7:32AM0.46m | 7:21PM0.48m | 8:08AM0.61m | 7:48PM0.63m | ||||||||
 | |  | |  | | | |  |  |  | | | | | |  | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — | — | 6:27 | — | — | 6:25 | — | — | 6:25 | — | — | 6:24 | — |
mm | 3 | 3 | 1 | 2 | — | 3 | 5 | 1 | 1 | — | — | 1 | 1 | — | 15 | 10 | 7 | 95 | 12 | 27 | 13 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 26 | 26 | 25 | 27 |
Feels °C | 30 | 30 | 31 | 31 | 30 | 30 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 29 | 29 | 27 | 29 | 25 | 26 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 6 | W 7 | WSW 19 | WSW 19 | WSW 18 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | W 5 | W 5 | W 9 | WSW 8 | W 11 | — | W 18 | WSW 17 | WSW 16 | — |
| kJ | 56 | 41 | 32 | 125 | 122 | 102 | 101 | 54 | 50 | 50 | 49 | 20 | 13 | 6 | 14 | 91 | — | 6 | 29 | 25 | — |
Swell 2 Height (m) Direction Period (s) | WSW 22 | WSW 21 | WSW 20 | — | W 7 | W 6 | — | — | W 6 | SE 4 | W 9 | WSW 15 | WSW 15 | WSW 15 | WSW 15 | W 19 | — | — | — | — | — |
| kJ | 45 | 90 | 75 | — | 8 | 7 | — | — | 3 | 1 | 2 | 22 | 21 | 21 | 21 | 7 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | WSW 16 | WSW 16 | WSW 15 | — | — | — | — | — | — | W 10 | SE 4 | W 8 | W 9 | — | W 20 | — | — | — | — | — | — |
| kJ | 25 | 25 | 21 | — | — | — | — | — | — | 2 | 1 | 5 | 2 | — | 8 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 7 | W 7 | W 7 | W 7 | WNW 3 | W 4 | W 5 | W 5 | W 5 | W 5 | W 5 | — | — | W 5 | W 4 | W 5 | W 7 | W 11 | W 8 | W 8 | W 8 |
| kJ | 21 | 21 | 14 | 22 | 4 | 9 | 20 | 28 | 16 | 20 | 23 | — | — | 12 | 13 | 58 | 601 | 1030 | 531 | 421 | 421 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 24 | 4 | 4 | 4 | 4 | 97 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 645 | 4 | 4 | 635 | 636 | 635 | 635 | 4 |
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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