
Surf Forecasts:
Nai Harn Beach surf forecast from 1 Aug 2026:
- Most powerful swell: Sunday 9 Aug, 1AM (local time) - 8ft (2.5m), 9s period, W swell with 1,270 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 Sunday (Aug 09) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 8s period and expected on Sunday (Aug 02) at 1AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Sun 9th Aug) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s on offer for the next couple of weeks down at Nai Harn Beach.
To be straight with you, this stretch of sand and reef is looking pretty grim for the whole 16-day run. There’s a big gap right from the start with no real surf on offer. The first week, from August 1st through to around August 7th, it’s all poor conditions – wind is mostly onshore or cross-onshore, and the wave quality is junk. We get some size building by the 4th, with swell around 3ft to 6ft from the W and WSW, but the wind turns fresh to strong, and the combined energy kicks up into the moderate range (202 to 446), yet it’s messy and stormy. By the 5th and 6th, we’re looking at 8ft to 8ft of W-SW swell with onshore wind howling at 22-28 mph, and the energy climbs into the strong bracket (973 to 1081). That’s big, raw, and blown-out – not for paddling. A beach-and-reef setup like Nai Harn with that much wind and size would be more interesting for kite surfing than paddle surfing.
The gap of no good surf runs through the entire first week and into the second. We finally see a flicker of life on the morning of August 14th, where a 7ft W swell with 9-second period and light SSW wind at 6 mph gives us a “marginal” call (combined energy 724 – moderate). But it’s still an onshore wind state, so don’t get your hopes up. After that, the rest of the run from the 15th onward is back to cross-onshore wind and choppy, lumpy conditions.
Water temp is sitting at 86°F with a 2° anomaly, so about average for the time of year – nothing to write home about.
Honestly, there’s no standout here. No break to highlight as the best on offer. If you’re desperate, that Friday morning on the 14th might be the least terrible, but it’s still onshore. Otherwise, keep the board in the car and wait for a change in the pattern.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Mon night. Warm (max 29°C on Sat afternoon, min 28°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 86mm), heaviest during Wed morning. Warm (max 28°C on Tue afternoon, min 27°C on Thu afternoon). Winds increasing (light winds from the WSW on Tue afternoon, strong winds from the WSW by Thu afternoon). | |||||||||||||||||||
Sat 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | ||||||||||||||
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 16 | WSW 16 | W 8 | W 8 | W 8 | WSW 15 | W 10 | W 7 | W 10 | WSW 9 | WSW 8 | WSW 9 | WSW 10 | W 10 | W 8 | WSW 9 | W 9 | W 9 | W 9 | W 9 |
Wave Graph | ||||||||||||||||||||
25 | 51 | 29 | 31 | 24 | 23 | 65 | 69 | 196 | 446 | 708 | 972 | 920 | 739 | 899 | 1081 | 963 | 985 | 775 | 958 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | on | on | on | on | on | cross-on | on | on | cross-on |
High Tide | 00:29AM1.73m | 12:32PM1.91m | 1:01AM1.75m | 1:04PM1.83m | 1:37AM1.74m | 1:39PM1.71m | 2:16AM1.69m | 2:20PM1.57m | 3:05AM1.62m | 3:12PM1.40m | 4:10AM1.54m | 4:30PM1.24m | ||||||||
Low Tide | 6:23PM0.07m | 6:24AM0.23m | 6:52PM0.07m | 6:59AM0.27m | 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 | |||||||
— | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | |
mm | — | 2 | — | 1 | 5 | — | — | 5 | 1 | 2 | 13 | 13 | 12 | 13 | 5 | 2 | 16 | 10 | 8 | 12 |
Temp °C | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 28 | 28 |
Feels °C | 32 | 33 | 33 | 31 | 32 | 33 | 33 | 32 | 30 | 29 | 27 | 27 | 28 | 26 | 26 | 23 | 26 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 8 | W 7 | W 10 | W 7 | W 10 | — | SSE 5 | S 5 | — | W 16 | — | — | — | — | WSW 16 | — |
49 | 33 | 29 | 31 | 18 | 17 | 65 | 69 | 196 | — | 2 | 1 | — | 5 | — | — | — | — | 25 | — | |
Swell 2 Height (m) Direction Period (s) | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 16 | WSW 15 | SSE 4 | SSE 4 | SSE 4 | — | — | — | SW 16 | — | — | — | — | — | SW 16 | — |
25 | 51 | 24 | 23 | 24 | 23 | 2 | 2 | 1 | — | — | — | 10 | — | — | — | — | — | 10 | — | |
Swell 3 Height (m) Direction Period (s) | S 4 | NW 5 | W 8 | — | — | S 3 | W 15 | W 15 | W 18 | — | — | — | — | — | — | — | — | — | — | — |
1 | 1 | 1 | — | — | 1 | 4 | 4 | 6 | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | S 4 | S 3 | — | S 4 | SSE 3 | — | WSW 9 | WSW 8 | WSW 9 | WSW 10 | W 10 | W 8 | WSW 9 | W 9 | W 9 | W 9 | W 9 |
— | — | — | 1 | 1 | — | 1 | 1 | — | 446 | 708 | 972 | 920 | 739 | 899 | 1081 | 963 | 985 | 775 | 958 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 8 | 4 | 4 | 4 | 24 | 24 | 82 | 797 | 797 | 688 | 1287 | 1002 | 601 | 1002 |
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.











