Surf Forecasts:
Similan Islands surf forecast from 12 Oct 2026:
- Best quality surf: Thursday 15 Oct, 7PM (local time) - 2ft (0.6m), 16s period, SW swell with glassy winds.
- Most powerful swell: Thursday 15 Oct, 7PM (local time) - 2ft (0.6m), 16s period, SW swell with 216 kJ wave energy.
- Next surfable swell (1★+): Tuesday 13 Oct, 7PM (local time) - 1ft (0.3m), 19s period with SW swell.
Best Forecast Surf Conditions for Similan Islands this week:
The surf forecast for Similan Islands over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Oct 13) at 7PM. The primary swell is predicted to be 0.3m and 19s period with a secondary swell of 0.3m and 14s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Similan Islands in the next 16 days are 0.6m 16s and forecast to arrive on Thursday (Oct 15) at 7PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 4s period and expected on Wednesday (Oct 14) at 10PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Tue 13th Oct) | 1ft (0.3m) 19s |
| Best Surf | 7PM (Thu 15th Oct) | 2ft (0.6m) 16s |
| Most Powerful | 7PM (Thu 15th Oct) | 2ft (0.6m) 16s |
Table - best surf conditions forecast for Similan Islands over the next 16 days.
Short Range ForecastHeavy rain (total 33mm), heaviest during Tue morning. Warm (max 28°C on Mon morning, min 26°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Sat night. Warm (max 29°C on Fri afternoon, min 28°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||
Monday 12 | Tuesday 13 | Wednesday 14 | Thursday 15 | Friday 16 | Saturday 17 | Sunday 18 | |||||||||||||||
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) | SW 14 | SW 14 | SW 14 | SW 19 | SW 19 | SW 18 | SW 18 | SW 18 | SW 16 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 15 | SW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 30 | 29 | 29 | 57 | 57 | 112 | 109 | 109 | 171 | 177 | 173 | 161 | 203 | 201 | 137 | 132 | 132 | 71 | 71 | 75 | 40 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | on | cross | cross-on | glassy | off | cross | cross | glassy | glassy | glassy | off | glassy | cross | cross-off | cross-on | cross | cross-off | cross-on | cross |
High Tide | 10:45AM2.12m | 10:59PM2.31m | 11:14AM2.02m | 11:27PM2.23m | 11:43AM1.89m | 11:55PM2.11m | 12:11PM1.75m | 00:24AM1.97m | 12:41PM1.59m | 00:57AM1.80m | 1:16PM1.43m | 1:39AM1.63m | 2:14PM1.28m | 2:53AM1.49m | |||||||
Low Tide | 4:51PM0.10m | 5:18AM0.10m | 5:17PM0.17m | 5:46AM0.18m | 5:42PM0.28m | 6:15AM0.30m | 6:07PM0.40m | 6:45AM0.45m | 6:33PM0.54m | 7:21AM0.62m | 7:04PM0.70m | 8:11AM0.78m | 7:49PM0.87m | ||||||||
 | |  | | | | |  |  |  | |  | | | | | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:15 | — | — | 6:14 | — | — | 6:14 | — | — | 6:13 | — | — | 6:13 | — | — | 6:12 | — | — | 6:12 | — |
mm | 6 | 4 | 5 | 10 | 2 | 1 | 2 | — | 3 | — | — | — | — | — | 2 | — | 1 | 7 | — | — | 10 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 28 | 28 | 29 | 29 |
Feels °C | 31 | 31 | 32 | 32 | 31 | 30 | 32 | 32 | 32 | 33 | 32 | 33 | 32 | 33 | 32 | 31 | 33 | 31 | 32 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 14 | SW 5 | SW 5 | SW 19 | SW 18 | SW 18 | SW 18 | SW 16 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 15 | SW 13 |
| kJ | 21 | 29 | 13 | 5 | 57 | 112 | 109 | 109 | 171 | 177 | 173 | 161 | 203 | 201 | 137 | 132 | 132 | 71 | 71 | 75 | 27 |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 21 | SW 14 | SW 19 | WSW 5 | SSW 14 | SW 5 | SSW 13 | — | — | — | — | — | W 9 | W 8 | W 7 | WSW 6 | W 6 | W 6 | W 5 | SW 16 |
| kJ | 30 | 17 | 29 | 57 | 2 | 20 | 1 | 16 | — | — | — | — | — | 2 | 4 | 4 | 4 | 3 | 2 | 2 | 40 |
Swell 3 Height (m) Direction Period (s) | — | — | SW 21 | SW 13 | SW 14 | WSW 5 | SW 12 | SE 4 | — | — | — | — | — | W 9 | — | SW 19 | SW 20 | SSW 18 | SW 17 | — | W 5 |
| kJ | — | — | 17 | 27 | 29 | 2 | 6 | 1 | — | — | — | — | — | 2 | — | 15 | 15 | 30 | 12 | — | 1 |
Wind waves Height (m) Direction Period (s) | — | SW 6 | — | — | — | — | — | — | — | — | — | — | — | W 6 | NW 6 | WNW 7 | — | — | — | — | NNW 3 |
| kJ | — | 20 | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 9 | — | — | — | — | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 618 | 67 | 618 | 67 | 67 | 0 | 0 | 67 | 67 | 0 | 0 | 0 | 0 | 0 | 67 | 0 | 612 | 67 | 0 | 612 | 67 |
Best forecast wave conditions in Andaman Sea | |||||||||||||||||||||
Best forecast wave conditions in Thailand | |||||||||||||||||||||
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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 Similan Islands 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 Similan Islands Surf forecast
The above surf forecast table for Similan Islands provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Similan Islands can be found by selecting the local surf guide option on the grey menu. Our Similan Islands 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 (Similan Islands) 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 Similan Islands 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.
Similan Islands is 107 km (66 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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