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Surf Forecasts:
Thailand surfForecast / Simeulue Island / Indonesia
16 Day Weather and Surf, issued 6 pm Monday 18 May 2026 WIBForecast update in hr min s Forecast update imminent
Thailand surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Thailand sea temperature is
30.4° C
(Which is slightly warmer than usual)Best Forecast Surf Conditions for Thailand this week:
The surf forecast for Thailand over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (May 19) at 1AM. The primary swell is predicted to be 0.9m and 15s period with a secondary swell of 0.9m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Thailand in the next 16 days are 1.2m 15s and forecast to arrive on Saturday (May 23) 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 0.5m 3s period and expected on Sunday (May 24) at 1PM.
| Wave Type | Time (WIB) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 19th May) | 3ft (0.9m) 15s |
| Best Surf | 7AM (Tue 19th May) | 3.5ft (1.1m) 14s |
| Most Powerful | 4AM (Sat 23rd May) | 4ft (1.2m) 15s |
Table - best surf conditions forecast for Thailand over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 18mm), heaviest on Mon night. Warm (max 30°C on Tue morning, min 27°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 34mm), heaviest during Sat morning. Warm (max 29°C on Thu afternoon, min 26°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | Sunday 24 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
S 17 | S 15 | S 14 | S 14 | SW 16 | SW 16 | SW 16 | SW 15 | SW 17 | SW 15 | SW 16 | SW 14 | SW 14 | SSW 16 | SW 15 | SW 14 | SW 14 | W 10 | W 10 | SSW 13 | SW 12 | |
470 | 357 | 478 | 439 | 659 | 468 | 603 | 640 | 555 | 535 | 692 | 528 | 520 | 382 | 566 | 443 | 463 | 573 | 511 | 304 | 149 | |
Wind (km/h) | |||||||||||||||||||||
cross | cross-off | cross | cross | cross | cross | cross-on | cross | cross-off | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross-off | cross | cross | off | off | |
High Tide | 7:15PM0.42m | 7:43AM0.79m | 8:01PM0.39m | 8:30AM0.76m | 8:52PM0.36m | 9:21AM0.71m | 9:51PM0.35m | 10:16AM0.65m | 11:06PM0.35m | 11:19AM0.59m | 00:38AM0.38m | 12:29PM0.53m | 2:04AM0.44m | ||||||||
Low Tide | 00:45AM-0.02m | 2:31PM0.02m | 1:25AM0.01m | 3:25PM0.06m | 2:08AM0.06m | 4:26PM0.10m | 2:58AM0.12m | 5:34PM0.13m | 4:03AM0.20m | 6:45PM0.15m | 5:48AM0.26m | 7:46PM0.15m | 7:54AM0.27m | ||||||||
 |  |  | | | | | | | | | | | | |  | |  |  |  | | |
 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 |
 | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | 6:37 |
1 | 5 | — | — | 5 | 2 | — | 4 | 1 | 1 | 1 | — | — | 7 | 6 | 1 | 11 | 7 | 5 | 2 | — | |
Temp °C | 29 | 28 | 30 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 27 | 26 | 26 | 26 | 29 |
31 | 31 | 33 | 31 | 31 | 33 | 32 | 31 | 33 | 33 | 32 | 32 | 31 | 31 | 31 | 30 | 29 | 29 | 28 | 29 | 29 | |
Swell 1 Height (m) Direction Period (s) | W 8 | S 15 | S 14 | S 14 | SW 16 | S 12 | SW 16 | SW 15 | SW 17 | SW 15 | SW 16 | SW 14 | SW 14 | SSW 16 | SW 15 | W 8 | W 9 | W 10 | W 10 | WSW 10 | WSW 8 |
 kJ | 108 | 357 | 478 | 439 | 659 | 347 | 603 | 640 | 555 | 535 | 692 | 528 | 520 | 382 | 566 | 187 | 449 | 573 | 511 | 210 | 78 |
Swell 2 Height (m) Direction Period (s) | S 17 | W 8 | SW 17 | SW 16 | S 13 | SW 16 | S 12 | S 9 | S 11 | S 11 | S 10 | S 9 | WNW 8 | SW 14 | W 8 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 13 | SW 12 |
| kJ | 470 | 105 | 297 | 361 | 395 | 468 | 330 | 79 | 209 | 143 | 141 | 85 | 68 | 265 | 161 | 443 | 463 | 352 | 342 | 304 | 149 |
Swell 3 Height (m) Direction Period (s) | S 13 | SW 18 | SW 13 | W 8 | — | W 7 | W 7 | S 12 | SW 14 | W 7 | W 7 | WNW 8 | S 9 | WNW 8 | S 9 | S 9 | SSE 8 | SSE 8 | S 8 | WNW 9 | W 9 |
| kJ | 215 | 307 | 61 | 55 | — | 34 | 34 | 134 | 245 | 22 | 24 | 50 | 64 | 87 | 40 | 38 | 24 | 22 | 10 | 141 | 79 |
Wind waves Height (m) Direction Period (s) | — | — | W 8 | — | W 7 | — | — | — | — | — | — | — | — | — | — | — | — | NNE 3 | — | — | — |
| kJ | — | — | 76 | — | 68 | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 207 | 207 | 0 | 252 | 207 | 207 | 118 | 118 | 207 | 118 | 118 | 125 | 207 | 118 | 207 | 253 | 118 | 118 | 253 | 0 |
Best forecast wave conditions in Simeulue Island | |||||||||||||||||||||
Best forecast wave conditions in Indonesia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 16 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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