Surf Forecasts:
Nai Harn Beach surf forecast from 17 Jul 2026:
- Most powerful swell: Tuesday 21 Jul, 4PM (local time) - 4ft (1.2m), 7s period, W swell with 127 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 1.2m 7s and forecast to arrive on Tuesday (Jul 21) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 7s period and expected on Wednesday (Jul 22) at 10PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Tue 21st Jul) | 4ft (1.2m) 7s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be honest, the next week and a half is looking pretty grim for a paddle. We’ve got a long stretch of poor conditions ahead, nearly two weeks of mostly cross-onshore wind and choppy, messy surf. The only real glimmer of hope is right at the very end of this 16-day window.
The first real chance of anything rideable pops up on Friday, the 31st of July. Before that, you’re looking at a solid 14 days of flat to small, wind-affected junk. The combined wave energy through that period is weak, often under 100, and the wind is a constant problem.
Let’s talk about that one standout. Nai Harn Beach on the morning of Friday, the 31st of July. The wind finally goes glassy, and we get a 1 ft swell from the WSW with a very long period of 19 seconds. That’s a proper groundswell. The combined energy reading is 121, which is moderate but for a tiny wave like that, the long period gives it some life. The water temp is a balmy 86°, which is about normal for this time of year. Now, this swell is tiny, and with that long period, it’s going to be a bit straight and fat over the beach and reef setup. But when it’s glassy like that and the wind is a slight air, the conditions will be clean. It’s a surfer’s choice, not a ripper.
For the rest of the window, it’s a no-go. The wind is mostly cross-on or onshore, and the swell is small and weak. The 21st of July has a little more energy (125 in the morning, 135 in the afternoon) with 4 ft from the west, but the wind is cross-on, making it a choppy mess. That’s more of a kite-surfing setup than a paddle session.
So, there it is. Strap in for a long flat spell, but keep an eye on that last Friday morning. If it’s clean, even a tiny wave is worth a look.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Warm (max 29°C on Fri afternoon, min 27°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Mon morning. Warm (max 29°C on Wed morning, min 27°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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 8 | WSW 16 | W 8 | W 8 | W 7 | W 8 | W 7 | W 7 | W 8 | W 5 | W 6 | W 6 | W 6 | W 7 | W 7 | W 7 | W 7 | W 16 | W 7 | W 18 | W 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 80 | 25 | 46 | 22 | 28 | 30 | 21 | 20 | 20 | 34 | 69 | 78 | 116 | 127 | 102 | 27 | 76 | 5 | 23 | 6 | 44 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | 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-on |
High Tide | 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 | 3:48PM1.25m | 4:51AM1.39m | 5:03PM1.12m | ||||||||
Low Tide | 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 | 10:03AM0.70m | 10:02PM0.60m | 11:26AM0.77m | 11:09PM0.69m | ||||||||
 |  |  | | |  | |  | | | |  | | | | | | | | |  | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — |
 | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — |
mm | — | — | — | — | — | 1 | — | 1 | — | 1 | — | — | 1 | — | — | — | — | — | — | — | 2 |
Temp °C | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 28 | 29 | 28 |
Feels °C | 30 | 31 | 30 | 31 | 31 | 31 | 30 | 29 | 30 | 30 | 29 | 30 | 30 | 30 | 30 | 31 | 31 | 30 | 30 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 7 | NW 7 | W 7 | W 7 | W 8 | W 7 | W 7 | W 8 | W 13 | W 16 | W 7 | W 6 | W 7 | W 7 | W 6 | W 18 | W 7 |
| kJ | 80 | 63 | 46 | 42 | 28 | 13 | 17 | 17 | 20 | 10 | 17 | 6 | 3 | 5 | 102 | 52 | 76 | 59 | 39 | 6 | 4 |
Swell 2 Height (m) Direction Period (s) | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WNW 8 | WSW 15 | WNW 7 | WSW 14 | WNW 7 | NW 7 | W 13 | W 13 | W 17 | W 13 | W 16 | W 7 | W 16 | W 16 | W 7 | W 14 | W 14 |
| kJ | 25 | 25 | 24 | 22 | 25 | 21 | 4 | 20 | 5 | 2 | 3 | 3 | 6 | 3 | 5 | 27 | 5 | 5 | 1 | 4 | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | WSW 15 | — | WSW 14 | NW 7 | WSW 14 | W 14 | W 8 | — | — | — | W 12 | W 16 | W 12 | — | W 18 | — | W 18 |
| kJ | — | — | — | — | 21 | — | 21 | 2 | 19 | 4 | 1 | — | — | — | 3 | 5 | 3 | — | 6 | — | 6 |
Wind waves Height (m) Direction Period (s) | — | WNW 2 | NW 7 | W 8 | W 8 | W 8 | W 4 | W 4 | W 4 | W 5 | W 6 | W 6 | W 6 | W 7 | W 7 | — | — | — | W 7 | W 7 | W 6 |
| kJ | — | 1 | 14 | 19 | 19 | 30 | 7 | 8 | 10 | 34 | 69 | 78 | 116 | 127 | 52 | — | — | — | 23 | 56 | 44 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 635 | 636 | 635 | 635 | 635 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 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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