Surf Forecasts:
Ko Samet - Sai Kaew surf forecast from 21 Jul 2026:
- Most powerful swell: Monday 27 Jul, 7PM (local time) - 4.5ft (1.3m), 6s period, SW swell with 101 kJ wave energy.
Best Forecast Surf Conditions for Ko Samet - Sai Kaew this week:
The most powerful waves expected at Ko Samet - Sai Kaew in the next 16 days are 1.3m 6s and forecast to arrive on Monday (Jul 27) at 7PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Mon 27th Jul) | 4.5ft (1.3m) 6s |
Table - best surf conditions forecast for Ko Samet - Sai Kaew over the next 16 days.
Short Range ForecastHeavy rain (total 41mm), heaviest during Wed night. Warm (max 30°C on Wed afternoon, min 27°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 44mm), heaviest during Sat night. Warm (max 29°C on Sat morning, min 27°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | |||||||||||||||
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 4 | SW 4 | SW 4 | WSW 5 | SW 6 | SW 4 | SW 5 | SW 6 | SW 5 | SW 6 | SW 4 | SW 5 | WSW 4 | SW 5 | SW 6 | SW 5 | SW 5 | SW 6 | SW 5 | SW 5 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 5 | 10 | 19 | 19 | 18 | 14 | 15 | 31 | 26 | 28 | 41 | 25 | 45 | 69 | 62 | 62 | 72 | 58 | 48 | 31 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross | cross | glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on |
High Tide | 7:09PM1.59m | 7:04PM1.67m | 7:10PM1.73m | 7:28PM1.78m | 7:55PM1.81m | 8:30PM1.83m | 9:10PM1.84m | ||||||||||||||
Low Tide | 5:01AM0.77m | 5:18AM0.60m | 5:49AM0.48m | 6:26AM0.38m | 7:07AM0.30m | 7:50AM0.24m | 8:32AM0.18m | ||||||||||||||
 | |  |  |  | | | | | | | | | |  |  |  |  |  | | | |
 | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — |
 | — | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:40 | — |
mm | — | — | 15 | 8 | 8 | 1 | 2 | 3 | 10 | 1 | — | 20 | 10 | 2 | — | 1 | — | — | — | 3 | 11 |
Temp °C | 29 | 30 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 31 | 32 | 32 | 31 | 29 | 30 | 32 | 31 | 29 | 30 | 29 | 28 | 28 | 27 | 27 | 27 | 26 | 27 | 27 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | S 6 | — | S 6 | S 6 | SW 6 | S 6 | SW 5 | SW 6 | S 6 | S 6 | S 6 | S 6 | S 7 | S 6 | S 6 | S 6 | S 6 | S 7 | — | SE 6 | S 6 |
| kJ | 1 | — | 1 | 1 | 19 | 1 | 14 | 15 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | — | 2 | 1 |
Swell 2 Height (m) Direction Period (s) | — | S 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 4 | SW 4 | SW 4 | WSW 5 | WSW 5 | SW 4 | — | — | SW 5 | SW 6 | SW 4 | SW 5 | WSW 4 | SW 5 | SW 6 | SW 5 | SW 5 | SW 6 | SW 5 | SW 5 | SW 5 |
| kJ | 10 | 5 | 10 | 19 | 18 | 18 | — | — | 31 | 26 | 28 | 41 | 25 | 45 | 69 | 62 | 62 | 72 | 58 | 48 | 31 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1254 | 1245 | 951 | 951 | 951 | 951 | 65 | 951 | 555 | 1254 | 941 | 1155 | 820 | 841 | 820 | 820 | 841 | 841 | 1155 | 1079 | 617 |
Best forecast wave conditions in Gulf of Thailand | |||||||||||||||||||||
Best forecast wave conditions in Thailand | |||||||||||||||||||||
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Information about the Ko Samet - Sai Kaew Surf forecast
The above surf forecast table for Ko Samet - Sai Kaew provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ko Samet - Sai Kaew can be found by selecting the local surf guide option on the grey menu. Our Ko Samet - Sai Kaew 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 (Ko Samet - Sai Kaew) 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 Ko Samet - Sai Kaew 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.
Ko Samet - Sai Kaew is 15 km (9 miles) from the city of Rayong. If you plan a holiday in Gulf of Thailand, look for hotels and other accommodation in Rayong. Rayong has rooms for a wide range of budgets as well as car hire and transport links.
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