Surf Forecasts:
Nai Harn Beach surf forecast from 3 Aug 2026:
- Most powerful swell: Friday 7 Aug, 7PM (local time) - 8ft (2.5m), 9s period, W swell with 1,171 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 2.5m 9s and forecast to arrive on Friday (Aug 07) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 5s period and expected on Tuesday (Aug 04) at 7PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Fri 7th Aug) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Right then, Rusty here. Let’s be straight with you about Nai Harn Beach. Looking at the whole 16-day window, I gotta tell you, it’s a rough one. There’s a lot of swell coming through, but it’s all got a cross-onshore or onshore wind plastered on top, and that’s ruining the party. The water is sitting at about 86°, which is pretty normal for this time of year, so no surprises there.
The first recommendation is for Monday, the 3rd of August. We’ve got a tiny 2 ft swell from the West, with a period of 9 seconds. The combined energy is weak (64). The wind is a cross-on from the SSW at 9 mph, making it choppy. Honestly, it’s poor surf conditions. Right from the start, it’s a struggle.
The rest of the week and into the next is a real slog. Tuesday the 4th through to Saturday the 9th, the swell jumps up, with heights between 6 ft and 8 ft from the West and West-Southwest. The period is short, 8 to 9 seconds, so it’s a messy windswell. The energy is moderate to strong (409 to 1010), but it’s all blown out by fresh, onshore winds from the WSW at 15 to 22 mph. With waves over 8 ft on Friday the 7th afternoon, that’s expert-only territory, but with the wind howling onshore, even the experts won’t be stoked. It’s a constant run of “poor surf conditions” – risk of thunderstorms and moderate rain making it a grim one.
The second week, from the 10th of August through to the 18th, is more of the same. Swell hangs around 5 ft to 8 ft from the West, with a short 8-second period. The wind stays mostly cross-on from the WSW at 15 to 22 mph, topping out at a fresh breeze. The energy is moderate to strong (407 to 846), but the quality is just missing. Every single entry is marked as “poor surf conditions.” It’s a long, blank run for any decent surf.
There’s no standout here. The best I can say is if you absolutely have to get wet, the smallest and most manageable day might be the afternoon of the 13th of August, with a 5 ft swell and a gentle cross-on breeze. But even then, it’s a “fairly choppy” mess. For a beach and reef break like this, with that much onshore wind, it’s looking more like a kite surfer’s playground than a surfer’s dream. It’s a tough outlook, but it tends not to stay this poor for long, and forecasts can change. Keep an eye on it.
Rusty.
Short Range ForecastHeavy rain (total 79mm), heaviest during Tue morning. Warm (max 30°C on Mon afternoon, min 28°C on Mon night). Winds increasing (light winds from the SSW on Mon afternoon, strong winds from the SW by Wed night). | Days 5-7 Weather SummaryHeavy rain (total 68mm), heaviest during Fri morning. Warm (max 29°C on Sat morning, min 27°C on Thu night). Mainly strong winds. | |||||||||||||||||||
Mon 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | ||||||||||||||
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 9 | W 9 | WSW 8 | WSW 8 | WSW 10 | W 8 | W 9 | W 9 | W 9 | W 9 | W 8 | W 9 | W 9 | W 9 | W 9 | W 9 | W 9 | W 8 | W 9 | W 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 43 | 56 | 533 | 682 | 555 | 422 | 384 | 413 | 537 | 549 | 708 | 828 | 1010 | 929 | 723 | 562 | 445 | 568 | 537 | 609 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | cross-on |
High Tide | 1:37AM1.74m | 1:39PM1.71m | 2:16AM1.69m | 2:20PM1.57m | 3:05AM1.62m | 3:12PM1.40m | 4:10AM1.54m | 4:30PM1.24m | 5:41AM1.50m | 6:30PM1.19m | 7:19AM1.58m | 8:11PM1.29m | ||||||||
Low Tide | 7:22PM0.11m | 7:37AM0.34m | 7:56PM0.19m | 8:22AM0.44m | 8:36PM0.30m | 9:18AM0.55m | 9:27PM0.44m | 10:40AM0.65m | 10:43PM0.57m | 12:34PM0.64m | 00:28AM0.61m | 2:09PM0.50m | 2:00AM0.52m | |||||||
 |  |  | |  | |  | | | | | | | | | | | | | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — |
mm | 1 | 11 | 12 | 2 | 18 | 10 | 7 | 14 | 4 | 10 | 21 | 15 | 9 | 6 | 2 | 1 | 2 | 2 | 2 | 1 |
Temp °C | 30 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 32 | 31 | 30 | 27 | 27 | 26 | 28 | 27 | 27 | 28 | 28 | 26 | 26 | 25 | 27 | 28 | 28 | 28 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | W 9 | W 9 | — | W 18 | SSE 5 | W 8 | W 9 | W 9 | W 9 | W 9 | SW 17 | WSW 16 | SE 5 | SE 4 | W 16 | W 9 | W 9 | W 16 | W 16 | — |
| kJ | 43 | 56 | — | 6 | 5 | 422 | 384 | 413 | 537 | 549 | 12 | 26 | 1 | 1 | 5 | 562 | 445 | 5 | 5 | — |
Swell 2 Height (m) Direction Period (s) | W 15 | SSE 4 | — | SW 17 | W 17 | WSW 16 | WSW 16 | WSW 16 | W 16 | WSW 16 | — | SW 17 | — | — | SE 4 | W 17 | — | W 16 | W 16 | — |
| kJ | 17 | 2 | — | 11 | 5 | 26 | 25 | 26 | 5 | 25 | — | 11 | — | — | 1 | 6 | — | 5 | 5 | — |
Swell 3 Height (m) Direction Period (s) | — | W 15 | — | — | — | — | — | — | W 19 | W 20 | — | — | — | — | SW 16 | SW 17 | — | — | — | — |
| kJ | — | 4 | — | — | — | — | — | — | 7 | 8 | — | — | — | — | 10 | 11 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | S 4 | WSW 3 | WSW 8 | WSW 8 | WSW 10 | SSE 4 | — | WSW 9 | WSW 9 | — | W 8 | W 9 | W 9 | W 9 | W 9 | WSW 9 | — | W 8 | W 9 | W 9 |
| kJ | 4 | 1 | 533 | 682 | 555 | 4 | — | 177 | 197 | — | 708 | 828 | 1010 | 929 | 723 | 202 | — | 568 | 537 | 609 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 24 | 24 | 82 | 797 | 782 | 601 | 82 | 82 | 797 | 82 | 82 | 82 | 797 | 797 | 82 | 82 | 646 | 82 | 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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