Surf Forecasts:
Nai Harn Beach surf forecast from 19 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 7AM (local time) - 6.5ft (2.0m), 7s period, W swell with 422 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 2.0m 7s and forecast to arrive on Thursday (Aug 20) at 7AM. 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 Wednesday (Aug 26) at 7AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Thu 20th Aug) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, let’s break it down. Nai Harn Beach is looking pretty grim for the next couple of weeks. The water temp is about 86°F, which is average for this time of year, so no weirdness there.
The first half-decent window doesn’t show up until the 1st of September. The morning brings a 8ft west swell with a short 8-second period, but it’s cross-on with a light breeze, so it’s a bit messy. The afternoon cleans up slightly with lighter winds, but it’s still only a marginal call.
The real standout is the morning of Wednesday, 2nd September. That’s when we get a clean 8ft west swell, 8-second period, and the wind goes light and cross-offshore from the north-northeast. That’s glassy conditions, and the wave energy is moderate (658). This is the session to aim for. Nai Harn (Phuket) is a beach and reef setup, so with that clean wind and solid size, it should offer some decent waves. Keep in mind, it’s inconsistent here, and 8ft is for intermediate and above – beginners will struggle.
The afternoon of the 2nd goes back to marginal with cross-on wind, and then it’s poor again from the 3rd onward. There’s a big gap of no good surf from now until the end of August. The 31st of August has a massive 10ft west swell, but it’s with a fresh cross-onshore wind, so it’s messy and lumpy – that’s expert-only, and the wind will spoil it.
So, the only real standout is the morning of the 2nd of September. Everything else is a write-off. The long-range stuff is promising but not certain, so don’t get your hopes up too much.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Fri morning. Warm (max 29°C on Thu morning, min 28°C on Wed morning). Winds decreasing (fresh winds from the W on Wed night, light winds from the WSW by Fri afternoon). | Days 4-6 Weather SummaryHeavy rain (total 38mm), heaviest during Sun night. Warm (max 29°C on Sat afternoon, min 28°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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 6 | W 7 | W 7 | W 7 | W 8 | W 8 | W 7 | W 7 | WSW 16 | W 8 | WSW 16 | WSW 16 | W 8 | SW 15 | W 15 | W 7 | W 15 | W 18 | W 17 | SW 16 | W 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 130 | 254 | 337 | 422 | 358 | 248 | 242 | 210 | 26 | 98 | 25 | 24 | 84 | 9 | 4 | 294 | 4 | 6 | 6 | 10 | 5 |
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 | on | cross-on | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 2:05PM1.41m | 2:39AM1.50m | 2:39PM1.24m | 3:28AM1.38m | 3:34PM1.08m | 5:01AM1.28m | 6:22PM1.00m | 7:14AM1.32m | 8:21PM1.11m | 8:24AM1.46m | 9:05PM1.26m | 9:06AM1.61m | 9:37PM1.41m | ||||||||
Low Tide | 8:12PM0.47m | 8:56AM0.66m | 8:43PM0.62m | 10:04AM0.80m | 9:36PM0.76m | 12:39PM0.83m | 11:56PM0.83m | 2:24PM0.71m | 1:51AM0.75m | 3:07PM0.55m | 2:46AM0.60m | 3:37PM0.40m | 3:24AM0.46m | ||||||||
 | |  | | |  |  |  |  | | |  | | | | | | | | | | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:40 | — | — | 6:39 | — | — | 6:39 | — | — | 6:38 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — |
mm | — | — | — | — | — | — | 1 | — | 3 | 6 | 1 | 2 | 7 | 5 | 8 | 5 | 1 | 3 | 5 | 5 | 3 |
Temp °C | 28 | 28 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 27 | 27 | 27 | 30 | 30 | 29 | 30 | 30 | 30 | 29 | 32 | 30 | 30 | 29 | 28 | 29 | 27 | 28 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | WSW 20 | — | — | — | WSW 18 | WSW 18 | W 7 | W 7 | WSW 16 | W 8 | W 8 | W 8 | W 8 | W 8 | W 15 | W 15 | W 15 | W 18 | W 17 | SW 16 | W 16 |
| kJ | 77 | — | — | — | 62 | 60 | 242 | 210 | 26 | 299 | 277 | 239 | 217 | 193 | 4 | 4 | 4 | 6 | 6 | 10 | 5 |
Swell 2 Height (m) Direction Period (s) | SW 13 | — | — | — | — | WSW 18 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | SW 15 | — | W 19 | — | W 14 | — | — | — |
| kJ | 7 | — | — | — | — | 30 | 57 | 54 | 26 | 25 | 25 | 24 | 23 | 9 | — | 7 | — | 4 | — | — | — |
Swell 3 Height (m) Direction Period (s) | W 16 | — | — | — | — | — | — | — | — | SE 4 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 5 | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 6 | W 7 | W 7 | W 7 | W 8 | W 8 | — | — | W 8 | W 8 | — | — | W 8 | — | W 8 | W 7 | W 7 | W 7 | W 7 | W 7 | W 8 |
| kJ | 130 | 254 | 337 | 422 | 358 | 248 | — | — | 198 | 98 | — | — | 84 | — | 223 | 294 | 269 | 200 | 287 | 311 | 283 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 636 | 797 | 635 | 635 | 4 | 24 | 635 | 4 | 24 | 24 | 4 | 4 | 4 | 4 | 24 | 4 | 24 | 4 | 4 | 4 | 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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