Surf Forecasts:
Nai Harn Beach surf forecast from 10 Jul 2026:
- Most powerful swell: Monday 13 Jul, 7AM (local time) - 7ft (2.1m), 8s period, W swell with 583 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 2.1m 8s and forecast to arrive on Monday (Jul 13) 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 8s period and expected on Monday (Jul 13) at 4PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Mon 13th Jul) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
G’day, Rusty here. Look, I’ll be straight with you – this Nai Harn Beach outlook is a tough one. Over the next 16 days, the forecast is a real mixed bag of onshore wind and messy conditions. There’s no standout window of clean, fun surf, so we’re going to have to be patient. The initial days are a write-off, and while there’s plenty of swell energy at times, the wind just ruins it.
We’ve got a gap of near-zero surf from the Monday afternoon of the 13th all the way through to the Thursday morning of the 16th, with tiny, weak waves barely registering. Then, from the 17th, the swell starts to build again, but it’s all coming with a strong cross-onshore wind. The water temp is about average for the time of year, nothing special to report.
For the first week, it’s a no-go. Saturday the 11th kicks off with a 5 ft to 5 ft W swell, but with a 19 mph cross-onshore wind, it’s lumpy and poor. The energy is moderate, but the wind is just too strong. Sunday the 12th sees the swell pushing 7 ft, with the energy climbing, but again, a 22 mph cross-onshore makes it a mess. The whole week is the same story: fresh to strong breezes, cross-onshore, with the occasional onshore wind. The only period that might be worth a look is the Monday morning of the 13th, where the wind is just onshore at 19 mph, and the swell is 6 ft from the W with an 8-second period. The energy is solid, but it’s still a poor surf call. The wind is not offshore, so it won’t be clean.
The second week doesn’t get much better. From Saturday the 18th, we’re looking at 7 ft to 8 ft swell from the W, with the energy climbing into the strong range. But the wind is a strong 25 mph cross-onshore, making it messy and really only for experts if they’re desperate. The best of a bad lot might be the Monday morning of the 20th of July, with a 8 ft W swell and a 9-second period, energy peaking. But with that strong breeze cross-onshore, it’s going to be a washing machine. For a beach and reef setup like Nai Harn, with that much cross-onshore wind, it’s looking more interesting for kite surfing than paddle surfing. The optimum swell direction is W, which is what we’re getting, but the wind is just wrong.
Honestly, there’s no session I can confidently recommend. Keep an eye on the charts, but for now, give it a miss.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Sun night. Warm (max 29°C on Fri night, min 28°C on Fri night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 26mm), heaviest during Mon night. Warm (max 29°C on Mon night, min 28°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
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 8 | W 8 | W 8 | W 8 | W 12 | W 20 | W 20 | W 19 | W 18 | W 17 | W 17 | W 8 | SW 16 | W 8 | WSW 17 | W 8 | W 7 | W 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 170 | 226 | 303 | 510 | 398 | 464 | 488 | 3 | 8 | 8 | 7 | 6 | 6 | 5 | 113 | 10 | 111 | 27 | 240 | 253 | 310 |
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 | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 7:28AM1.68m | 8:02PM1.36m | 8:34AM1.80m | 9:10PM1.46m | 9:30AM1.92m | 10:06PM1.56m | 10:19AM2.03m | 10:55PM1.65m | 11:05AM2.08m | 11:40PM1.70m | 11:47AM2.09m | 00:22AM1.71m | 12:27PM2.03m | 1:02AM1.70m | |||||||
Low Tide | 2:06PM0.45m | 1:59AM0.41m | 3:10PM0.30m | 3:02AM0.33m | 4:04PM0.16m | 3:57AM0.25m | 4:51PM0.05m | 4:45AM0.20m | 5:35PM-0.01m | 5:30AM0.18m | 6:16PM-0.02m | 6:13AM0.21m | 6:54PM0.02m | ||||||||
 |  |  | |  |  | |  |  | | | | | | | | | | | |  | |
 | 6:15 | — | — | 6:15 | — | — | 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 | — | — | 1 | — | 1 | 5 | 5 | 6 | 7 | 3 | 1 | 1 | 4 | 5 | 1 | 2 | 2 | 4 | — | 2 | — |
Temp °C | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 | 28 |
Feels °C | 28 | 28 | 28 | 29 | 28 | 29 | 28 | 28 | 29 | 30 | 32 | 33 | 29 | 29 | 30 | 30 | 28 | 30 | 29 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | WSW 15 | WSW 15 | — | — | WSW 13 | W 16 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | SE 4 | W 8 | WSW 17 | WSW 16 | WSW 16 | — |
| kJ | 21 | 21 | — | — | 17 | 5 | 488 | 439 | 339 | 428 | 339 | 253 | 291 | 260 | 273 | 1 | 298 | 27 | 25 | 25 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | W 12 | W 12 | W 20 | W 20 | SSE 5 | SE 5 | SSE 4 | SSE 5 | SSE 5 | SW 16 | WSW 16 | — | — | — | — |
| kJ | — | — | — | — | — | — | 3 | 3 | 8 | 8 | 3 | 1 | 2 | 2 | 2 | 10 | 26 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 15 | W 14 | W 19 | W 18 | W 17 | W 17 | W 16 | SW 16 | SE 4 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 4 | 4 | 7 | 6 | 6 | 5 | 5 | 10 | 1 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 6 | W 7 | W 7 | W 8 | W 8 | W 8 | — | — | — | SSE 4 | — | — | — | — | W 8 | W 8 | W 8 | W 8 | W 8 | W 7 | W 7 |
| kJ | 170 | 226 | 303 | 510 | 398 | 464 | — | — | — | 2 | — | — | — | — | 113 | 266 | 111 | 219 | 240 | 253 | 310 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 635 | 636 | 635 | 636 | 601 | 24 | 635 | 601 | 24 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 24 | 4 | 635 | 636 | 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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