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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 12 am Friday 01 Aug 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 Friday (Aug 01) at 4AM. The primary swell is predicted to be 1.0m and 7s period with a secondary swell of 0.3m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Similan Islands in the next 12 days are 2.2m 8s and forecast to arrive on Monday (Aug 04) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Friday (Aug 08) at 1AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Fri 1st Aug) | 3.5ft (1.0m) 7s |
| Best Surf | 4AM (Thu 7th Aug) | 7ft (2.2m) 8s |
| Most Powerful | 4AM (Mon 4th Aug) | 7ft (2.2m) 8s |
Table - best surf conditions forecast for Similan Islands over the next 12 days.
Short Range Forecast Moderate rain (total 11mm), heaviest on Sat night. Warm (max 29°C on Fri afternoon, min 27°C on Sat night). Wind will be generally light. | Days 3-6 Weather Summary Heavy rain (total 52mm), heaviest during Tue morning. Warm (max 28°C on Sun night, min 27°C on Mon night). Mainly strong winds. | |||||||||||||||||||||
Friday 01 | Saturday 02 | Sunday 03 | Monday 04 | Tuesday 05 | Wednesday 06 | Thu 07 | ||||||||||||||||
| 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) (?) | 7 | 7 | 7 | 18 | 9 | 9 | 8 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 6 | 8 | 9 | |
Wave (?)Graph  | ||||||||||||||||||||||
| Energy (?) | 178 | 126 | 119 | 96 | 328 | 387 | 332 | 276 | 367 | 627 | 622 | 496 | 435 | 574 | 519 | 535 | 439 | 386 | 330 | 367 | 319 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- off | cross | cross- on | cross- on | cross- on | cross- on | glass | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross | cross- off | |
High Tide / height (m) | 2:27AM 1.77 | 2:27PM 1.59 | 3:11AM 1.66 | 3:13PM 1.42 | 4:13AM 1.56 | 4:32PM 1.27 | 5:43AM 1.53 | 6:28PM 1.24 | 7:13AM 1.60 | 7:57PM 1.34 | 8:17AM 1.75 | 8:52PM 1.49 | 9:03AM 1.93 | |||||||||
Low Tide / height (m) | 8:27AM 0.70 | 8:32PM 0.60 | 9:15AM 0.82 | 9:12PM 0.73 | 10:37AM 0.92 | 10:20PM 0.84 | 12:58PM 0.89 | 12:26AM 0.85 | 2:18PM 0.74 | 1:54AM 0.74 | 3:02PM 0.57 | 2:46AM 0.59 | 3:37PM 0.39 | |||||||||
Friday 01 | Saturday 02 | Sunday 03 | Monday 04 | Tuesday 05 | Wednesday 06 | Thu 07 | ||||||||||||||||
| Sunrise | - | 6:20 | - | - | 6:20 | - | - | 6:20 | - | - | 6:20 | - | - | 6:20 | - | - | 6:20 | - | - | 6:20 | - | |
| Sunset | - | - | 6:50 | - | - | 6:50 | - | - | 6:50 | - | - | 6:49 | - | - | 6:49 | - | - | 6:49 | - | - | 6:49 | |
 |  | |  |  | | | | | | | | | | | | | | |  | | ||
Rain (mm) | - | - | - | 3 | 1 | - | 7 | - | - | 4 | 6 | 3 | 10 | 6 | 2 | 6 | 6 | 9 | 5 | - | - | |
| Temp. °C | 28 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | |
| Feels °C (?) | 32 | 32 | 32 | 33 | 32 | 31 | 32 | 32 | 32 | 29 | 29 | 29 | 28 | 26 | 27 | 26 | 26 | 25 | 29 | 30 | 29 | |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Andaman Sea
Continuing clean conditions at Similan Islands (light winds from the WNW at Phuket International Airport 91 km from Similan Islands). 1.0m 6s windswell from the WSW with a 0.3m 13s groundswell from the SW. 2 swells combining to make bigger set waves.
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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