
Surf Forecasts:
Similan Islands surf forecast from 10 Jul 2026:
- Most powerful swell: Monday 13 Jul, 10AM (local time) - 10ft (3.0m), 8s period, WSW swell with 1,058 kJ wave energy.
Best Forecast Surf Conditions for Similan Islands this week:
The most powerful waves expected at Similan Islands in the next 16 days are 3.0m 8s and forecast to arrive on Monday (Jul 13) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 5s period and expected on Wednesday (Jul 15) at 1AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Mon 13th Jul) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Similan Islands over the next 16 days.
Short Range ForecastModerate rain (total 12mm), heaviest on Mon morning. Warm (max 29°C on Sun afternoon, min 28°C on Fri night). Mainly strong winds. | Days 4-6 Weather SummaryHeavy rain (total 38mm), heaviest during Tue morning. Warm (max 28°C on Mon night, min 28°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | WSW 6 | WSW 7 | WSW 7 | WSW 8 | WSW 8 | W 8 | WSW 8 | W 8 | W 8 | WSW 8 | W 8 | W 8 | W 8 | W 8 | W 9 | W 8 | W 8 | W 8 | W 8 | W 7 | W 8 |
Wave Graph | |||||||||||||||||||||
237 | 307 | 445 | 822 | 867 | 857 | 1058 | 819 | 650 | 893 | 675 | 617 | 659 | 559 | 537 | 546 | 539 | 377 | 358 | 381 | 458 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on | cross-on | on | on | on |
High Tide | 7:02AM1.91m | 7:35PM1.59m | 8:08AM2.04m | 8:45PM1.70m | 9:06AM2.18m | 9:42PM1.83m | 9:57AM2.31m | 10:32PM1.93m | 10:44AM2.39m | 11:18PM2.01m | 11:27AM2.41m | 00:00AM2.04m | 12:07PM2.36m | 00:41AM2.03m | |||||||
Low Tide | 1:44PM0.53m | 1:42AM0.47m | 2:48PM0.35m | 2:47AM0.37m | 3:42PM0.17m | 3:41AM0.26m | 4:30PM0.04m | 4:29AM0.19m | 5:14PM-0.03m | 5:14AM0.17m | 5:55PM-0.04m | 5:57AM0.20m | 6:34PM0.01m | ||||||||
6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | |
mm | — | — | 1 | 1 | 1 | 2 | 3 | 2 | 9 | 7 | 2 | 3 | 5 | 2 | 5 | 2 | 3 | 2 | 1 | — | — |
Temp °C | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 27 | 27 | 27 | 27 | 28 | 27 | 26 | 27 | 28 | 27 | 27 | 28 | 28 | 28 | 29 | 28 | 28 | 29 | 28 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 15 | SW 11 | SSW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 |
136 | 134 | 128 | 62 | 61 | 39 | 23 | 23 | 22 | 8 | 19 | 31 | 44 | 42 | 64 | 62 | 33 | 145 | 159 | 155 | 221 | |
Swell 2 Height (m) Direction Period (s) | SW 12 | SW 18 | SW 18 | — | SW 16 | SW 16 | — | SW 15 | SW 15 | SW 20 | SW 18 | SE 5 | SW 13 | SE 4 | SE 5 | SE 5 | SW 17 | N 11 | NNW 10 | NNW 10 | — |
22 | 12 | 12 | — | 10 | 10 | — | 8 | 8 | 15 | 13 | 1 | 7 | 1 | 1 | 1 | 47 | 2 | 10 | 10 | — | |
Swell 3 Height (m) Direction Period (s) | — | SW 18 | — | — | — | — | — | — | SW 20 | SW 15 | SW 14 | SW 13 | SE 5 | SW 13 | — | SW 19 | — | N 11 | — | — | — |
— | 12 | — | — | — | — | — | — | 16 | 8 | 8 | 7 | 1 | 7 | — | 15 | — | 2 | — | — | — | |
Wind waves Height (m) Direction Period (s) | WSW 6 | WSW 7 | WSW 7 | WSW 8 | WSW 8 | W 8 | WSW 8 | W 8 | W 8 | WSW 8 | W 8 | W 8 | W 8 | W 8 | W 9 | W 8 | W 8 | W 8 | W 8 | W 7 | W 8 |
237 | 307 | 445 | 822 | 867 | 857 | 1058 | 819 | 650 | 893 | 675 | 617 | 659 | 559 | 537 | 546 | 539 | 377 | 358 | 381 | 458 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 698 | 716 | 698 | 716 | 708 | 97 | 698 | 708 | 97 | 112 | 97 | 97 | 97 | 97 | 97 | 97 | 97 | 97 | 698 | 716 | 716 |
Best forecast wave conditions in Andaman Sea | |||||||||||||||||||||
Best forecast wave conditions in Thailand | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 16 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.










