Similan Islands surfForecast / Andaman Sea / Thailand

information circle12 Day Weather and Surf, issued 6 am Tuesday 30 Dec 2025 +07
Forecast update in hr  min  s Forecast update imminent
Similan Islands surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Similan Islands sea temperature is
28.9° C
(Which is slightly warmer than usual)


Best Forecast Surf Conditions for Similan Islands this week:

The surf forecast for Similan Islands over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Dec 31) at 7AM. The primary swell is predicted to be 0.3m and 12s period with a secondary swell of 0.2m and 13s. Another secondary swell of 0.4m and 3s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Similan Islands in the next 12 days are 0.6m 10s and forecast to arrive on Sunday (Jan 04) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Sunday (Jan 04) at 1AM.

Wave TypeTime (+07) & Date Wave Height & Period
Next good surf (1 star+) 7AM (Wed 31st Dec)1ft (0.3m) 12s
Best Surf 7AM (Wed 31st Dec)1ft (0.3m) 12s
Most Powerful10AM (Sun 4th Jan)2ft (0.6m) 10s

Table - best surf conditions forecast for Similan Islands over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 28°C on Tue afternoon, min 27°C on Tue morning). Wind will be generally light.

Days 3-6 Weather Summary Some drizzle, heaviest during Sat night. Warm (max 28°C on Sat afternoon, min 26°C on Fri morning). Wind will be generally light.

Tuesday
30
Wednesday
31
Thursday
01
Friday
02
Saturday
03
Sunday
04
Monday
05
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
1
Swell
Height Map
Wave Height (m) & direction (?)
0.3
SW
0.3
SW
0.3
SW
0.3
SW
0.3
SW
0.1
SW
0.1
SW
0.1
SW
0.1
SW
0.1
SW
0.3
N
0.1
SW
0.1
S
0.1
N
0.3
SW
0.6
SW
0.6
SW
0.5
SW
0.5
SW
0.5
SW
0.5
SW
Period(s) (?)131313121212121212124111351110999109
Wave
Graph
(?)Metric surfscale
Energy kJ (?)272726242366655554119615541414639
Wind
(km/h)
5
ENE
10
NNW
10
NNE
10
NNE
15
N
15
NNE
10
NE
15
N
15
NNE
10
E
5
WSW
10
ENE
20
E
10
S
20
E
20
ENE
10
E
20
ENE
15
NE
5
WNW
10
ENE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
on
cross-
off
cross-
off
crosscross-
off
cross-
off
crosscross-
off
offglassoffoffcrossoffcross-
off
offoffcross-
off
glassoff
High Tide
/ height (m)
6:37PM
1.89
7:03AM
1.60
7:43PM
2.01
8:15AM
1.68
8:41PM
2.14
9:15AM
1.78
9:33PM
2.26
10:06AM
1.88
10:20PM
2.35
10:53AM
1.94
11:03PM
2.39
11:36AM
1.97
11:44PM
2.37
Low Tide
/ height (m)
11:58AM
0.53
1:13AM
0.60
1:14PM
0.48
2:22AM
0.42
2:20PM
0.38
3:18AM
0.24
3:15PM
0.29
4:06AM
0.10
4:04PM
0.21
4:51AM
0.01
4:49PM
0.18
5:33AM
-0.02
5:31PM
0.20
Tuesday
30
Wednesday
31
Thursday
01
Friday
02
Saturday
03
Sunday
04
Monday
05
Sunrise6:41--6:43--6:43--6:43--6:43--6:43--6:45--
Sunset-6:20--6:21--6:21--6:22--6:22--6:22--6:22-
part cloud
clear
part cloud
clear
clear
clear
part cloud
clear
clear
clear
part cloud
part cloud
clear
part cloud
rain showers
clear
part cloud
clear
clear
clear
part cloud
Rain (mm)
--------------1------
Temp. °C272828272727272727272727272828272828262727
Feels °C (?)303130302828302929302929293027262927272929
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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 12 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.

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