Snow-ForecastSnow-ForecastMountain-ForecastMountain-ForecastTide-ForecastTide-ForecastWeather-ForecastWeather-Forecast
Search by country, region, or break
Search by country, region, or break

Quick Links

Surf Forecasts:

Similan Islands surfForecast / Andaman Sea / Thailand

information circle12 Day Weather and Surf, issued 12 am Tuesday 30 Sep 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
29.0° C
 (Which is normal for this time of year)

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 (Oct 01) at 4PM. The primary swell is predicted to be 1.3m and 8s period with a secondary swell of 0.3m and 14s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Similan Islands in the next 12 days are 2.3m 8s and forecast to arrive on Tuesday (Sep 30) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Wednesday (Oct 01) at 4PM.

Wave TypeTime (+07) & Date Wave Height & Period
Next good surf (1 star+) 4PM (Wed 1st Oct)4.5ft (1.3m) 8s
Best Surf10PM (Fri 3rd Oct)2.5ft (0.8m) 17s
Most Powerful 7AM (Tue 30th Sep)7.5ft (2.3m) 8s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Heavy rain (total 33mm), heaviest during Mon night. Warm (max 28°C on Tue night, min 25°C on Wed afternoon). Winds decreasing (strong winds from the SW on Mon night, calm by Wed afternoon).

Days 3-6 Weather Summary Light rain (total 6mm), mostly falling on Sat night. Warm (max 28°C on Thu night, min 24°C on Sun morning). Wind will be generally light.

Tuesday
30
Wednesday
01
Thursday
02
Friday
03
Saturday
04
Sunday
05
Mon
06
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
2
2
1
1
1
2
1
2
1
1
1
0
1
1
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
2.5
W
2.1
W
2
W
1.7
W
1.5
W
1.3
W
1.2
W
1.2
W
1
W
0.4
SW
0.6
SW
0.7
SW
0.8
SW
0.8
SW
0.8
SW
0.8
SW
0.7
SW
0.7
SW
0.7
SW
0.6
SW
0.6
SW
Period(s) (?)888888888201818171616161616151514
Wave
Graph
(?)Metric surfscale
Energy kJ (?)825572533372298219187191132134266307413380371357239236224134132
Wind
(km/h)
40
SW
30
WSW
30
SW
20
SW
15
SW
5
S
5
SSW
5
WSW
5
NNW
15
N
10
NNE
10
NNW
10
NW
10
N
10
WSW
5
W
15
SW
10
WSW
5
NW
10
W
15
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		glassglasscross-
on		cross-
on		crosscross-
off		crosscross-
on		crosscross-
on		oncross-
on		oncross-
on		onon
High Tide
/ height (m)
2:05AM
1.58
2:32PM
1.23
3:52AM
1.45
5:40PM
1.21
6:09AM
1.52
7:16PM
1.42
7:19AM
1.72
8:02PM
1.68
8:05AM
1.93
8:39PM
1.94
8:44AM
2.13
9:13PM
2.18
9:21AM
2.28
Low Tide
/ height (m)
8:38AM
0.85
8:20PM
0.88
11:16AM
0.92
11:08PM
0.98
1:13PM
0.75
1:10AM
0.82
1:56PM
0.53
2:01AM
0.60
2:30PM
0.30
2:42AM
0.38
3:03PM
0.10
3:20AM
0.18
3:36PM
-0.05
Tuesday
30
Wednesday
01
Thursday
02
Friday
03
Saturday
04
Sunday
05
Mon
06
Sunrise-6:16--6:16--6:16--6:16--6:16--6:16--6:16-
Sunset--6:21--6:20--6:20--6:19--6:19--6:17--6:17
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
rain showers
thunderstorm
part cloud
rain showers
thunderstorm
thunderstorm
Rain (mm)
1455522---------42-214
Temp. °C272727282725272828282728272728272527272727
Feels °C (?)242626292929313231303031303031302829303029
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Andaman Sea

  1. weather stationWind Update Continuing clean conditions at Similan Islands (light winds from the WNW at PhuketAirport 89 km from Similan Islands). 2.3m 8s swell from the WSW which is too big for here.

    1 hour 0 minutes ago Similan Islands
Expand
<
>
View all

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 Similan Islands 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.

View detailed surf forecast for Similan Islands at:
surf-forecast.com

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.

Nearest
Nearest
Nearest