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Surf Forecasts:
Khao Lak / Nang Thong surfForecast / Andaman Sea / Thailand
12 Day Weather and Surf, issued 12 am Tuesday 16 Sep 2025 +07
Best Forecast Surf Conditions for Khao Lak / Nang Thong this week:
The surf forecast for Khao Lak / Nang Thong over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 22) at 7PM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.4m and 15s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Khao Lak / Nang Thong in the next 12 days are 1.8m 8s and forecast to arrive on Tuesday (Sep 16) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Mon 22nd Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 7PM (Mon 22nd Sep) | 3.5ft (1.1m) 8s |
| Most Powerful | 4AM (Tue 16th Sep) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Khao Lak / Nang Thong over the next 12 days.
Short Range Forecast Heavy rain (total 63mm), heaviest during Tue afternoon. Warm (max 28°C on Wed morning, min 26°C on Mon night). Wind will be generally light. | Days 3-6 Weather Summary Heavy rain (total 38mm), heaviest during Thu night. Warm (max 28°C on Fri morning, min 26°C on Thu night). Wind will be generally light. | |||||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Mon 22 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 8 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | |
Wave (?)Graph  | ||||||||||||||||||||||
| Energy (?) | 581 | 402 | 417 | 285 | 213 | 193 | 189 | 178 | 198 | 197 | 251 | 288 | 273 | 388 | 416 | 347 | 377 | 369 | 337 | 284 | 242 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | on | on | on | on | on | on | on | on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | |
High Tide / height (m) | 4:52AM 1.73 | 6:36PM 1.45 | 6:58AM 1.81 | 8:05PM 1.66 | 8:07AM 2.01 | 8:48PM 1.89 | 8:50AM 2.19 | 9:20PM 2.10 | 9:24AM 2.34 | 9:48PM 2.28 | 9:54AM 2.44 | 10:14PM 2.41 | 10:22AM 2.48 | |||||||||
Low Tide / height (m) | 12:27PM 0.90 | 12:37AM 1.01 | 1:59PM 0.70 | 2:02AM 0.81 | 2:45PM 0.49 | 2:49AM 0.59 | 3:19PM 0.32 | 3:25AM 0.42 | 3:48PM 0.19 | 3:57AM 0.28 | 4:14PM 0.11 | 4:26AM 0.19 | 4:39PM 0.08 | |||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Mon 22 | ||||||||||||||||
| Sunrise | - | 6:16 | - | - | 6:16 | - | - | 6:16 | - | - | 6:16 | - | - | 6:16 | - | - | 6:16 | - | - | 6:16 | - | |
| Sunset | - | - | 6:27 | - | - | 6:25 | - | - | 6:24 | - | - | 6:24 | - | - | 6:23 | - | - | 6:23 | - | - | 6:22 | |
 |  | | | | | | | | | | | | | | | |  |  | |  | ||
Rain (mm) | 7 | 5 | 7 | 8 | 6 | 6 | 13 | 5 | 6 | 11 | 4 | 4 | 5 | 3 | 3 | 6 | 2 | - | - | - | - | |
| Temp. °C | 27 | 27 | 27 | 27 | 28 | 27 | 27 | 27 | 27 | 27 | 28 | 27 | 27 | 28 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | |
| Feels °C (?) | 30 | 29 | 28 | 30 | 31 | 29 | 30 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 30 | 31 | 30 | 31 | 31 | 31 | |
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Recent Eyeball Surf Reports for Andaman Sea
Continuing clean conditions at Khao Lak / Nang Thong (calm at Phuket Airport 56 km from Khao Lak / Nang Thong). 1.8m 8s swell from the WSW with a 0.7m 14s groundswell from the SW. 2 swells combining so expect closeout sets.
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Khao Lak / Nang Thong surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Khao Lak / Nang Thong Surf forecast
The above surf forecast table for Khao Lak / Nang Thong provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Khao Lak / Nang Thong can be found by selecting the local surf guide option on the grey menu. Our Khao Lak / Nang Thong 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 (Khao Lak / Nang Thong) 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 Khao Lak / Nang Thong 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.
Khao Lak / Nang Thong is 81 km (50 miles) from Kathu. If you plan a holiday in Andaman Sea, look for hotels and other accommodation in Kathu. Kathu has rooms for a wide range of budgets as well as car hire and transport links.
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