Surf Forecasts:
Nai Harn Beach surf forecast from 18 Jul 2026:
- Most powerful swell: Wednesday 22 Jul, 4PM (local time) - 4ft (1.2m), 7s period, W swell with 131 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 Wednesday (Jul 22) 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 1.2m 7s period and expected on Wednesday (Jul 22) at 1PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Wed 22nd Jul) | 4ft (1.2m) 7s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, this is Rusty. Let me tell you straight up: if you're looking for a wave around Nai Harn Beach over the next couple of weeks, you're gonna be mostly staring at flat, messy water. There are zero good surf days on offer here—absolutely no standouts for paddle surfing. We're looking at a solid 16-day stretch of poor conditions, starting from right now on Saturday, the 18th of July, and running all the way to Sunday, the 2nd of August.
The whole period is dominated by cross-onshore winds, mostly from the west and west-northwest, keeping things choppy and lumpy. Swell heights barely tickle 3 ft most days, with a few exceptions that just bring more wind and chop rather than any quality. The combined wave energy is weak throughout—most values sit under 100, hovering in the 20s and 30s, which tells you there's bugger-all power in the water.
There's a small bump on Tuesday the 21st of July, with a 4 ft swell showing in the afternoon and combined energy hitting 108 (moderate), but it's from the west at a short, weak 6-second period and blown out by 20 km/h cross-onshore winds. That's not surfable. On Wednesday the 22nd of July afternoon, we see 4 ft with 161 energy, but again, 7-second period and moderate cross-onshore breeze means it's just a choppy mess.
The only time we get something a bit bigger is on Friday the 31st of July morning, when a 6 ft west swell rolls in with 398 energy (moderate), but it's under onshore winds at 35 km/h and a short 8-second period. That's not clean; that's a washing machine. Then on Sunday the 2nd of August morning, we get 7 ft from the west with 515 energy—strong—but it's still cross-onshore at 35 km/h and a jumbly 8-second period. For Nai Harn Beach, a beach-and-reef setup exposed to the west, that kind of wind and chop makes it more interesting for kite surfing than a proper paddle session.
Water temperature? It's about average for this time of year, nothing wild going on. But don't bother suiting up for any quality waves. I'd leave the board at home and check back later. Forecasts can change, but right now, it's a long blank run. Keep an eye out. This is Rusty, signing off.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Warm (max 28°C on Sat morning, min 27°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Tue night. Warm (max 29°C on Thu morning, min 27°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | |||||||||||||||
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 15 | W 7 | W 8 | W 7 | W 7 | W 8 | W 7 | W 7 | W 7 | W 8 | W 7 | W 16 | W 16 | W 7 | W 16 | W 18 | W 18 | W 18 | W 6 | W 16 | W 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 22 | 27 | 29 | 21 | 27 | 20 | 9 | 8 | 58 | 10 | 113 | 5 | 5 | 131 | 5 | 6 | 6 | 6 | 29 | 5 | 6 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | cross-on | 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 | cross-on | cross | cross-on |
High Tide | 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 | 6:13AM1.37m | 6:53PM1.09m | ||||||||
Low Tide | 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 | 1:10PM0.75m | 00:40AM0.72m | ||||||||
 |  |  |  | |  | | |  | | | |  |  | | | |  | |  | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — |
mm | — | — | 1 | — | — | — | — | — | 1 | — | — | 2 | 2 | 1 | 1 | — | 2 | 2 | 1 | 1 | 11 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 31 | 29 | 30 | 31 | 30 | 31 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 30 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 7 | W 8 | W 7 | W 7 | W 8 | WNW 7 | W 7 | W 8 | W 8 | W 16 | W 16 | W 16 | W 16 | W 16 | W 18 | W 18 | W 14 | W 6 | W 16 | WNW 6 |
| kJ | 42 | 27 | 29 | 17 | 27 | 20 | 15 | 8 | 1 | 10 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 4 | 64 | 5 | 66 |
Swell 2 Height (m) Direction Period (s) | WSW 15 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | WSW 14 | W 7 | W 13 | W 13 | W 13 | W 13 | W 12 | — | W 16 | W 12 | W 15 | W 15 | W 18 | W 16 | — | W 17 |
| kJ | 22 | 21 | 21 | 21 | 20 | 19 | 9 | 3 | 3 | 3 | 3 | 3 | — | 5 | 3 | 4 | 4 | 6 | 5 | — | 6 |
Swell 3 Height (m) Direction Period (s) | — | — | — | W 7 | W 8 | — | W 14 | W 9 | — | W 17 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 1 | 1 | — | 4 | 2 | — | 6 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 3 | WNW 8 | NW 7 | W 4 | NW 7 | WNW 7 | W 3 | W 8 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 6 | W 6 | W 6 | — |
| kJ | 1 | 25 | 14 | 8 | 12 | 17 | 2 | 31 | 58 | 70 | 113 | 124 | 124 | 131 | 117 | 92 | 104 | 66 | 29 | 76 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 635 | 4 | 4 | 635 | 4 | 24 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 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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