Surf Forecasts:
Nai Harn Beach surf forecast from 15 Jul 2026:
- Best quality surf: Wednesday 15 Jul, 4PM (local time) - 4.5ft (1.3m), 8s period, W swell with glassy winds.
- Most powerful swell: Wednesday 15 Jul, 1PM (local time) - 4.5ft (1.3m), 8s period, W swell with 191 kJ wave energy.
- Next surfable swell (1★+): Wednesday 15 Jul, 4PM (local time) - 4.5ft (1.3m), 8s period with W swell.
Best Forecast Surf Conditions for Nai Harn Beach this week:
The surf forecast for Nai Harn Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jul 15) at 4PM. The primary swell is predicted to be 1.3m and 8s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Nai Harn Beach in the next 16 days are 1.3m 8s and forecast to arrive on Wednesday (Jul 15) at 1PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 8s period and expected on Wednesday (Jul 15) at 10AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Wed 15th Jul) | 4.5ft (1.3m) 8s |
| Best Surf | 4PM (Wed 15th Jul) | 4.5ft (1.3m) 8s |
| Most Powerful | 1PM (Wed 15th Jul) | 4.5ft (1.3m) 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's on the cards for Nai Harn Beach.
Right off the bat, I gotta be straight with ya – this 16-day stretch is a tough one. The first proper surf we see is on Wednesday afternoon, the 15th of July, and even then it's marginal. The whole window is a real mixed bag of poor conditions and tiny swell. There are long gaps of nothing worthwhile, especially from the 17th right through to the end. We’re looking at a lot of moderate to fresh cross-onshore winds that’ll chop it up.
The only time it gets close to interesting is on Wednesday afternoon, the 15th. We’ve got some glassy conditions with an ESE wind that's dead calm – that’s a major positive. The swell is coming straight out of the West at 4ft, but with a short period of just 8 seconds. The combined wave energy is moderate at 191. This is really the one stand-out moment: clean, small waves for an intermediate surfer to have a mess around on, but honestly, the quality is just ordinary.
After that, it’s a downhill slide. Thursday the 16th has a glassy morning with 3ft West swell and 114 energy, but again, it’s very ordinary. From there, we get slapped with a run of poor surf. The wind stays cross-onshore or onshore for days on end, and the swell height drops to nothing. The water temp at Nai Harn is about what you’d expect for the time of year, nothing to write home about.
Honestly, for the rest of the period, forget it. The swell is too small and the wind is just wrong. The only other thing I can say is that on the 22nd of July, Wednesday afternoon is glassy again with a tiny 3ft West swell, but with only 90 energy, it’s more of a flat spell than a surf. This is the reality of the area when the swell windows are this slim.
It’s a bleak outlook, mates. Don't expect much. Forecasts can always change, but right now, the only session worth paddling for is that Wednesday afternoon on the 15th.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Wed morning. Warm (max 29°C on Wed afternoon, min 28°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 14mm), heaviest on Sun morning. Warm (max 29°C on Mon afternoon, min 27°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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 17 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WSW 16 | W 8 | WSW 15 | WSW 15 | W 7 | W 5 | W 6 | W 7 | W 6 | W 7 | W 6 | W 7 | W 7 | W 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 186 | 144 | 104 | 104 | 80 | 60 | 25 | 46 | 22 | 21 | 36 | 27 | 49 | 103 | 91 | 134 | 76 | 146 | 120 | 87 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | glassy | cross-on | cross | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on |
High Tide | 11:05AM2.08m | 11:40PM1.70m | 11:47AM2.09m | 00:22AM1.71m | 12:27PM2.03m | 1:02AM1.70m | 1:05PM1.91m | 1:42AM1.66m | 1:42PM1.76m | 2:21AM1.60m | 2:20PM1.59m | 3:02AM1.52m | 2:59PM1.41m | 3:50AM1.45m | |||||||
Low Tide | 4:45AM0.20m | 5:35PM-0.01m | 5:30AM0.18m | 6:16PM-0.02m | 6:13AM0.21m | 6:54PM0.02m | 6:54AM0.27m | 7:31PM0.10m | 7:35AM0.36m | 8:06PM0.21m | 8:18AM0.48m | 8:40PM0.34m | 9:05AM0.60m | 9:17PM0.48m | |||||||
 |  |  | | | |  | |  | | |  | | | | | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — |
mm | 4 | — | — | — | — | — | — | — | 1 | 1 | 2 | 4 | 3 | — | 2 | 1 | — | 2 | — | — | — |
Temp °C | 28 | 29 | 29 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 32 | 34 | 33 | 32 | 32 | 32 | 32 | 30 | 31 | 30 | 30 | 30 | 29 | 28 | 29 | 28 | 30 | 29 | 31 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WSW 15 | WSW 15 | WNW 7 | W 7 | WNW 7 | W 14 | WSW 9 | W 9 | WNW 7 | W 7 | W 7 | W 7 |
| kJ | 193 | 186 | 144 | 104 | 104 | 80 | 60 | 61 | 46 | 22 | 21 | 11 | 16 | 9 | 4 | 25 | 15 | 29 | 146 | 120 | 87 |
Swell 2 Height (m) Direction Period (s) | SSE 5 | SSE 5 | SSE 5 | SSE 6 | SSE 5 | WSW 17 | WSW 16 | WSW 16 | WSW 16 | W 9 | — | WSW 15 | WSW 14 | W 7 | — | W 14 | W 13 | W 13 | W 13 | W 13 | W 16 |
| kJ | 5 | 5 | 2 | 10 | 5 | 27 | 25 | 25 | 24 | 2 | — | 21 | 21 | 9 | — | 4 | 4 | 3 | 3 | 3 | 5 |
Swell 3 Height (m) Direction Period (s) | W 17 | W 17 | W 16 | SW 16 | WSW 16 | SSE 5 | — | — | — | — | — | — | W 7 | WNW 8 | — | — | — | W 18 | W 17 | W 16 | W 12 |
| kJ | 6 | 5 | 5 | 10 | 26 | 2 | — | — | — | — | — | — | 1 | 7 | — | — | — | 6 | 6 | 5 | 3 |
Wind waves Height (m) Direction Period (s) | — | — | S 5 | — | — | — | — | — | NW 7 | W 7 | W 8 | W 7 | W 5 | W 6 | W 7 | W 6 | W 7 | W 6 | W 7 | — | — |
| kJ | — | — | 2 | — | — | — | — | — | 14 | 54 | 57 | 36 | 27 | 49 | 103 | 91 | 134 | 76 | 52 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 0 | 0 | 0 | 4 | 4 | 4 | 4 | 4 | 24 | 4 | 4 | 635 | 636 | 4 | 4 | 4 | 4 | 4 | 24 | 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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