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Thailand surfForecast / Simeulue Island / Indonesia
12 Day Weather and Surf, issued 12 pm Wednesday 20 Aug 2025 WIB
Best Forecast Surf Conditions for Thailand this week:
The surf forecast for Thailand over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 20) at 4PM. The primary swell is predicted to be 0.9m and 18s period with a secondary swell of 0.9m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Thailand in the next 12 days are 2.0m 16s and forecast to arrive on Sunday (Aug 24) at 1AM. Winds are predicted to be glassy at the time the swell arrives.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Wed 20th Aug) | 3ft (0.9m) 18s |
| Best Surf | 10PM (Wed 20th Aug) | 4.5ft (1.4m) 17s |
| Most Powerful | 1AM (Sun 24th Aug) | 6.5ft (2.0m) 16s |
Table - best surf conditions forecast for Thailand over the next 12 days.
Short Range Forecast Mostly dry. Warm (max 29°C on Fri afternoon, min 26°C on Fri night). Wind will be generally light. | Days 3-6 Weather Summary Light rain (total 7mm), mostly falling on Mon night. Warm (max 28°C on Sat morning, min 26°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | Sunday 24 | Monday 25 | Tuesday 26 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 14 | 18 | 16 | 16 | 15 | 15 | 15 | 14 | 17 | 15 | 14 | 16 | 15 | 14 | 14 | 13 | 13 | 13 | 13 | 18 | 16 |
Wave (?)Graph  | |||||||||||||||||||||
| Energy (?) | 662 | 773 | 1085 | 1240 | 1256 | 1207 | 1307 | 1400 | 1592 | 1694 | 1859 | 1972 | 1554 | 1352 | 1093 | 904 | 797 | 872 | 953 | 1092 | 847 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | glass | glass | glass | on | cross- on | cross- on | on | glass | glass | glass | glass | glass | cross- on | glass | glass | cross- on | on | glass | cross | cross- on |
High Tide / height (m) | 4:45PM 0.32 | 5:00AM 0.66 | 5:30PM 0.38 | 5:42AM 0.70 | 6:07PM 0.45 | 6:19AM 0.72 | 6:41PM 0.51 | 6:52AM 0.72 | 7:13PM 0.56 | 7:22AM 0.70 | 7:43PM 0.59 | 7:49AM 0.66 | 8:14PM 0.61 | ||||||||
Low Tide / height (m) | 10:03PM 0.12 | 12:04PM 0.07 | 11:00PM 0.09 | 12:32PM 0.05 | 11:44PM 0.06 | 12:57PM 0.04 | 12:23AM 0.05 | 1:19PM 0.03 | 12:59AM 0.05 | 1:40PM 0.03 | 1:33AM 0.07 | 1:59PM 0.04 | 2:05AM 0.09 | ||||||||
Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | Sunday 24 | Monday 25 | Tuesday 26 | |||||||||||||||
| Sunrise | 6:31 | - | - | 6:31 | - | - | 6:31 | - | - | 6:31 | - | - | 6:31 | - | - | 6:31 | - | - | 6:31 | - | - |
| Sunset | - | 6:43 | - | - | 6:43 | - | - | 6:43 | - | - | 6:42 | - | - | 6:42 | - | - | 6:42 | - | - | 6:40 | - |
 | |  |  | |  | | | | | | | | | |  | |  | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 7 | - | - | 2 |
| Temp. °C | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 27 |
| Feels °C (?) | 31 | 31 | 32 | 32 | 30 | 30 | 31 | 31 | 30 | 31 | 30 | 29 | 31 | 30 | 30 | 32 | 30 | 31 | 31 | 30 | 30 |
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Recent Eyeball Surf Reports for Simeulue Island
The wind is still cross-off at Thailand (light winds from the N at Medan/Polonia Airport 294 km from Thailand). 0.9m 13s groundswell from the SW with a 0.4m 9s swell from the S and a 0.4m 7s swell from the WNW. 3 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 Thailand 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 Thailand Surf forecast
The above surf forecast table for Thailand provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Thailand can be found by selecting the local surf guide option on the grey menu. Our Thailand 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 (Thailand) 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 Thailand 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.
Are you planning a holiday in Simeulue Island? If you are looking for accommodation near Thailand, camping, hotels and holiday cottages in Simeulue Island, consider staying in Batoe Nasera which is 84 km (52 miles) away.
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