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Similan Islands Surf Forecast
/ Andaman Sea (9 surf breaks) /
Similan Islands surfForecast / Andaman Sea / Thailand
12 Day Weather and Surf, issued 6 pm Wednesday 30 Apr 2025 +07
Best Forecast Surf Conditions for Similan Islands this week:
The surf forecast for Similan Islands over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (May 03) at 1AM. The primary swell is predicted to be 0.4m and 15s period with a secondary swell of 0.2m and 12s. Another secondary swell of 0.3m and 3s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Similan Islands in the next 12 days are 1.5m 6s and forecast to arrive on Wednesday (May 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 0.3m 2s period and expected on Sunday (May 04) at 1AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sat 3rd May) | 1.5ft (0.4m) 15s |
| Best Surf | 1AM (Sat 3rd May) | 1.5ft (0.4m) 15s |
| Most Powerful | 7PM (Wed 7th May) | 5ft (1.5m) 6s |
Table - best surf conditions forecast for Similan Islands over the next 12 days.
Wed 30 | Thursday 01 | Friday 02 | Saturday 03 | Sunday 04 | Monday 05 | Tuesday 06 | Wednesday 07 | Thursday 08 | Friday 09 | Saturday 10 | Sunday 11 | Mon 12 | ||||||||||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Rating (10 max) | ||||||||||||||||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||||||||||||||
| Period(s) (?) | 15 | 14 | 14 | 13 | 13 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 12 | 5 | 17 | 17 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 6 | 6 | 7 | 7 | 7 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 34 | 33 | 29 | 28 | 27 | 42 | 37 | 77 | 78 | 75 | 97 | 70 | 70 | 63 | 60 | 43 | 27 | 24 | 24 | 42 | 47 | 70 | 134 | 64 | 49 | 154 | 178 | 126 | 196 | 199 | 178 | 217 | 247 | 225 | 277 | 285 |
Wind (km/h) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | on | cross- off | cross- on | cross- on | cross | cross- on | cross- off | cross- on | cross- on | cross- off | glass | cross- on | cross- on | on | on | on | cross- on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on |
High Tide / height (m) | 12:04AM 1.94 | 12:19PM 2.24 | 12:48AM 1.75 | 1:02PM 2.04 | 1:39AM 1.55 | 1:54PM 1.83 | 2:49AM 1.39 | 3:04PM 1.65 | 4:33AM 1.34 | 4:41PM 1.55 | 6:15AM 1.42 | 6:11PM 1.57 | 7:17AM 1.58 | 7:14PM 1.64 | 7:56AM 1.74 | 7:59PM 1.72 | 8:28AM 1.89 | 8:35PM 1.79 | 8:57AM 2.02 | 9:08PM 1.85 | 9:25AM 2.11 | 9:40PM 1.87 | 9:53AM 2.16 | |||||||||||||
Low Tide / height (m) | 6:05PM 0.04 | 6:03AM 0.22 | 6:49PM 0.20 | 6:43AM 0.41 | 7:38PM 0.39 | 7:28AM 0.62 | 8:40PM 0.58 | 8:27AM 0.82 | 10:08PM 0.71 | 10:13AM 0.95 | 11:52PM 0.72 | 12:16PM 0.92 | 1:00AM 0.64 | 1:25PM 0.79 | 1:44AM 0.55 | 2:10PM 0.65 | 2:18AM 0.47 | 2:46PM 0.51 | 2:47AM 0.39 | 3:17PM 0.39 | 3:15AM 0.33 | 3:47PM 0.30 | 3:43AM 0.29 | |||||||||||||
Wed 30 | Thursday 01 | Friday 02 | Saturday 03 | Sunday 04 | Monday 05 | Tuesday 06 | Wednesday 07 | Thursday 08 | Friday 09 | Saturday 10 | Sunday 11 | Mon 12 | ||||||||||||||||||||||||
| Sunrise | - | - | 6:13 | - | - | 6:13 | - | - | 6:13 | - | - | 6:13 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 |
| Sunset | 6:38 | - | - | 6:38 | - | - | 6:38 | - | - | 6:38 | - | - | 6:38 | - | - | 6:38 | - | - | 6:38 | - | - | 6:39 | - | - | 6:39 | - | - | 6:39 | - | - | 6:39 | - | - | 6:39 | - | - |
 |  | | | |  | | |  |  |  | | | | | | | | | |  | | | | | | | | | | | | | | | | |
Rain (mm) | - | 3 | - | - | 8 | - | - | 6 | 9 | 5 | - | - | 3 | - | - | 8 | 3 | 7 | 5 | 6 | 1 | 1 | 3 | - | 1 | 2 | 1 | 1 | 2 | 1 | - | 1 | 1 | 13 | 11 | 11 |
| Temp. °C | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 27 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 27 |
| Feels °C (?) | 32 | 32 | 33 | 32 | 32 | 32 | 31 | 31 | 30 | 31 | 31 | 33 | 31 | 32 | 31 | 30 | 31 | 31 | 28 | 26 | 30 | 30 | 30 | 31 | 30 | 30 | 30 | 29 | 29 | 28 | 29 | 29 | 28 | 26 | 26 | 25 |
Short Range Forecast: Heavy rain (total 26mm), heaviest during Sat morning. Warm (max 29°C on Wed afternoon, min 27°C on Thu night). Wind will be generally light. | Days 3-6 Weather Summary Heavy rain (total 26mm), heaviest during Tue morning. Warm (max 29°C on Mon night, min 26°C on Sat night). Wind will be generally light. | Days 6-9 Weather Summary Heavy rain (total 20mm), heaviest during Tue night. Warm (max 29°C on Wed night, min 26°C on Tue night). Winds decreasing (fresh winds from the WNW on Tue night, light winds from the WSW by Wed morning). | Long Range Forecast: Heavy rain (total 44mm), heaviest during Sun night. Warm (max 29°C on Fri afternoon, min 26°C on Sun afternoon). Mainly strong winds. | |||||||||||||||||||||||||||||||||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
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 12 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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