Surf Forecasts:
Nai Harn Beach surf forecast from 26 Jul 2026:
- Most powerful swell: Wednesday 29 Jul, 4PM (local time) - 3ft (0.9m), 7s period, WSW swell with 91 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 0.9m 7s and forecast to arrive on Wednesday (Jul 29) 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 1.4m 6s period and expected on Sunday (Jul 26) at 10PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Wed 29th Jul) | 3ft (0.9m) 7s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s cookin' for Nai Harn Beach.
Right off the bat, I gotta be straight with you – this stretch of the 16-day window is a tough one. The whole run is a bit of a bust, honestly. We’ve got a solid week of poor surf quality with cross-onshore winds just wrecking the surface. The water temp is running at 87°, which is a touch warmer than normal for this time of year, so at least you won’t be cold while you’re getting frustrated.
The first real chance of anything even bordering on surfable is on Monday, 6th August. That morning we’ve got a 7ft west swell, period around 8 seconds, with a gentle breeze blowing onshore. The combined energy is strong at 715. The problem is, the commentary calls it “marginal” due to tide conditions. At 7ft, it’s a bit solid for beginners, but it’s not a clean, classic wave. The wind is from the southwest, but it’s onshore, so it’ll be a bit mushy and bumpy. It’s the only day that gets a score of 1 out of 10, which tells you the state of things.
The following Sunday, 9th August, the morning is borderline. You’ve got a 7ft west swell, period 9 seconds, with a gentle cross-onshore breeze from the south. The energy is a strong 979. Again, it’s scored as marginal. The wind is light, so it might be a little less choppy than the other days, but it’s still cross-onshore. It’s not a stand-out, just the least bad option.
Honestly, mate, for the next couple of weeks, Nai Harn is a write-off for a clean, proper session. The wind is consistently ugly, and the swell is either too small or too messy. If you’re desperate, the 6th and 9th of August are your only real shots, and even then, keep your expectations in the gutter. The rest of the time, it’s a lake. There’s a big gap of days with no recommendations at all from the 26th of July all the way through.
Rusty.
Short Range ForecastHeavy rain (total 21mm), heaviest during Tue afternoon. Warm (max 29°C on Sun morning, min 26°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 45mm), heaviest during Fri night. Warm (max 28°C on Wed afternoon, min 26°C on Wed morning). Mainly fresh winds. | ||||||||||||||||||||
Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | |||||||||||||||
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 6 | W 13 | W 13 | W 7 | W 7 | W 15 | W 16 | W 16 | W 16 | WSW 7 | W 16 | W 8 | W 21 | W 20 | WSW 18 | WSW 18 | WSW 18 | WSW 16 | WSW 16 | WSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 175 | 148 | 3 | 3 | 59 | 47 | 4 | 5 | 5 | 5 | 91 | 5 | 64 | 8 | 7 | 33 | 31 | 30 | 26 | 25 | 25 |
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-on | on | on | on | on |
High Tide | 9:13PM1.25m | 9:22AM1.64m | 9:52PM1.36m | 9:59AM1.75m | 10:26PM1.46m | 10:32AM1.85m | 10:58PM1.55m | 11:03AM1.92m | 11:28PM1.63m | 11:33AM1.95m | 11:58PM1.69m | 12:02PM1.95m | 00:29AM1.73m | ||||||||
Low Tide | 3:18PM0.54m | 2:55AM0.58m | 3:55PM0.42m | 3:37AM0.47m | 4:28PM0.31m | 4:14AM0.38m | 4:58PM0.22m | 4:47AM0.30m | 5:27PM0.14m | 5:19AM0.25m | 5:55PM0.09m | 5:51AM0.23m | 6:23PM0.07m | ||||||||
 | |  |  | |  | |  | | |  |  | | |  | | | | | | | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:47 | — | — | 6:46 | — | — | 6:46 | — | — | 6:46 | — | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — |
mm | 2 | 1 | 2 | — | 1 | — | 3 | 8 | 4 | — | — | 8 | 6 | — | 5 | 5 | 7 | 14 | 5 | 2 | 3 |
Temp °C | 29 | 29 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 28 | 28 | 28 |
Feels °C | 30 | 29 | 28 | 29 | 28 | 29 | 28 | 30 | 29 | 26 | 27 | 30 | 29 | 28 | 29 | 27 | 27 | 28 | 29 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 14 | W 14 | W 13 | W 13 | W 7 | W 7 | W 7 | W 7 | W 8 | SSE 4 | W 7 | W 8 | W 8 | W 8 | W 8 | W 8 | WNW 8 | WNW 9 | W 8 | W 8 | W 9 |
| kJ | 8 | 4 | 3 | 3 | 154 | 92 | 154 | 173 | 181 | 2 | 206 | 172 | 157 | 181 | 157 | 137 | 112 | 129 | 88 | 66 | 78 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | W 13 | W 12 | W 15 | W 12 | W 16 | W 16 | SSE 4 | SSE 4 | SE 4 | SE 4 | W 20 | WSW 18 | WSW 18 | WSW 18 | WSW 16 | WSW 16 | WSW 16 |
| kJ | — | — | — | — | 3 | 3 | 4 | 3 | 5 | 5 | 2 | 2 | 1 | 1 | 7 | 33 | 31 | 30 | 26 | 25 | 25 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 15 | W 12 | W 16 | W 13 | — | W 16 | W 16 | W 15 | W 21 | — | — | W 14 | SSE 4 | SSE 4 | SSE 4 | S 4 |
| kJ | — | — | — | — | — | 4 | 3 | 5 | 3 | — | 5 | 5 | 4 | 8 | — | — | 4 | 2 | 2 | 2 | 1 |
Wind waves Height (m) Direction Period (s) | W 6 | W 6 | W 6 | W 7 | W 7 | W 7 | — | — | — | W 8 | WSW 7 | — | W 8 | — | — | — | S 4 | — | — | — | SSW 4 |
| kJ | 175 | 148 | 141 | 173 | 59 | 47 | — | — | — | 217 | 91 | — | 64 | — | — | — | 1 | — | — | — | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 636 | 636 | 635 | 24 | 4 | 4 | 24 | 4 | 4 | 635 | 636 | 4 | 4 | 636 | 4 | 4 | 4 | 24 | 24 | 108 | 24 |
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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