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Surf Forecasts:
Thailand surfForecast / Simeulue Island / Indonesia
48hr 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)How big are the waves at Thailand today?
The current surf forecast for Thailand at 10PM is: 1.1m 15s primary swell from a South direction and 0.9m 8s secondary swell from a West direction (forecast issued at 06:00pm May 18). The wind direction is predicted to be cross-shore.
| Time (WIB) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | - | - |
| Afternoon (18 May) | 3ft (0.9m) | 17s |
| Evening (18 May) | 3.5ft (1.1m) | 15s |
Table - waves today at Thailand. (Swell directed towards the surf break)
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. | ||||||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
S 17 | S 15 | S 15 | S 15 | S 15 | S 14 | S 14 | S 14 | S 14 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 17 | SW 15 | |
470 | 452 | 531 | 357 | 524 | 499 | 478 | 458 | 439 | 492 | 574 | 659 | 504 | 492 | 468 | 619 | 603 | 595 | 580 | 640 | 557 | 557 | 555 | 542 | |
Wind (km/h) | ||||||||||||||||||||||||
cross | cross | cross | cross-off | cross | cross-off | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross-off | cross-off | cross | |
High Tide | 7:15PM0.42m | 7:43AM0.79m | 8:01PM0.39m | 8:30AM0.76m | 8:52PM0.36m | 9:21AM0.71m | ||||||||||||||||||
Low Tide | 1:42PM0.00m | 00:45AM-0.02m | 2:31PM0.02m | 1:25AM0.01m | 3:25PM0.06m | 2:08AM0.06m | ||||||||||||||||||
 |  |  | | |  |  |  | |  | | | | | | | | | | | | | | | |
 | — | — | — | — | 6:24 | — | — | — | — | — | — | — | 6:24 | — | — | — | — | — | — | — | 6:24 | — | — | — |
 | 6:37 | — | — | — | — | — | — | — | 6:37 | — | — | — | — | — | — | — | 6:37 | — | — | — | — | — | — | 6:37 |
— | 1 | — | 1 | 3 | 1 | — | — | — | — | 1 | 2 | 2 | — | 1 | 1 | — | — | 1 | 1 | 1 | 1 | — | 1 | |
Temp °C | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 30 | 29 | 29 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 28 | 28 | 27 | 27 | 28 | 29 |
31 | 30 | 31 | 31 | 31 | 31 | 32 | 33 | 31 | 32 | 31 | 31 | 31 | 32 | 33 | 32 | 32 | 32 | 31 | 32 | 30 | 31 | 32 | 33 | |
Swell 1 Height (m) Direction Period (s) | W 8 | S 15 | S 15 | S 15 | S 15 | S 14 | S 14 | S 14 | S 14 | S 13 | S 13 | SW 16 | S 13 | S 13 | S 12 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 17 | SW 15 |
 kJ | 108 | 452 | 531 | 357 | 524 | 499 | 478 | 458 | 439 | 420 | 411 | 659 | 395 | 377 | 347 | 619 | 603 | 595 | 580 | 640 | 557 | 557 | 555 | 542 |
Swell 2 Height (m) Direction Period (s) | S 17 | W 8 | W 8 | W 8 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | S 13 | SW 16 | SW 16 | SW 16 | S 12 | S 12 | S 12 | S 9 | S 9 | S 12 | S 9 | S 11 | S 11 |
| kJ | 470 | 108 | 105 | 105 | 437 | 370 | 297 | 380 | 361 | 492 | 574 | 395 | 504 | 492 | 468 | 336 | 330 | 273 | 81 | 79 | 221 | 56 | 209 | 191 |
Swell 3 Height (m) Direction Period (s) | S 13 | SW 13 | SW 18 | SW 18 | SW 13 | SW 13 | SW 13 | W 8 | W 8 | W 7 | — | — | — | W 7 | W 7 | W 7 | W 7 | W 7 | S 12 | S 12 | W 7 | S 12 | SW 14 | W 7 |
| kJ | 215 | 85 | 203 | 307 | 87 | 87 | 61 | 74 | 55 | 54 | — | — | — | 49 | 34 | 34 | 34 | 33 | 136 | 134 | 23 | 97 | 245 | 23 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | WNW 8 | W 8 | W 8 | — | — | — | W 7 | W 7 | W 7 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 107 | 100 | 76 | — | — | — | 54 | 68 | 66 | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 252 | 252 | 207 | 0 | 207 | 0 | 207 | 253 | 252 | 252 | 252 | 207 | 207 | 207 | 207 | 207 | 252 | 207 | 118 | 207 | 207 | 0 | 0 | 207 |
Best forecast wave conditions in Simeulue Island | ||||||||||||||||||||||||
Best forecast wave conditions in Indonesia | ||||||||||||||||||||||||
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