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Koh Samui weather forecasts:

 As we stay here on Koh Samui, we came to realize that there is no exact forecast for the whole Koh Samui island. Even at the same day there can be up to 3 different weather situations at different times on different parts of Kho Samui, as it is divided by high mountains ( up to 630 meters ). Weather on Ko Samui often changes within the hour or even minutes. We cannot predict the weather anymore. All we can say that we do have approx. 300 pure sunshine days here. For a forecast and weather history visit the Thai Meteorological Institute But even there the information is mostly vague, as it might say thunderstorms for a specific date, but it is in fact only for half an hour.
 

 

Average Weather and Climate Table for Surat Thani, Ko Samui

Month
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Average temperature (oC) 

Daily 26.6 27.3 28.2 29.1 29.0 28.5 28.2 28.1 27.7 27.1 26.6 26.4
Morning Mininum 24.1 25.0 25.7 26.1 25.8 25.5 25.1 25.1 24.8 24.4 24.1 23.8
Extreme Min 18.6 19.5 21.0 22.0 22.9 21.5 19.9 21.6 21.5 21.1 20.3 18.8
Afternoon Maximun 28.9 29.5 30.7 32.1 32.6 32.2 32.0 31.8 31.5 30.5 29.5 29.0
Extreme Max 32.6 34.1 35.5 36.5 36.3 35.8 36.0 35.5 35.4 34.1 34.0 32.0

Average relative humidity (%) 

at 0700 am. 87 87 87 87 87 84 84 84 87 91 91 87
at 0100 pm.
 
77 77 76 74 70 68 66 67 69 76 79 75

Surface wind

Mean Speed (km./hr.)
 
10.4 11.3 10.2 6.9 7.0 9.1 9.1 9.6 8.0 5.7 6.9 9.1
Direction
 
east
southeast east
 
east
 
west
 
west
 
west
 
west
 
west
 
west
 
east
 
east
 

Average rainfall

Amount (mm./month)
 
130.6 56.2 65.6 75.0 143.6 108.7 123.2 121.4 117.0 303.5 490.4 210.7
Rainy Day (day/month)
 
10.7 5.6 4.9 7.9 14.6 14.3 14.3 15.2 16.0 19.6 19.5 14.0
Heavy Rainy Day (day/month)
Greater Than 35 mm./day
 
0.5 0.4 0.6 0.4 1.1 0.6 0.7 0.7 0.5 2.5 3.6 1.8

Visibility (km.)

Time 07.00
 
6.1 6.4 6.4 7.5 9.8 10.0 9.6 9.8 10.6 8.9 6.9 6.0
Daily
 
6.5 6.8 6.9 7.9 10.0 9.9 9.7 9.9 10.5 8.7 7.1 6.3
 

 

 

Koh Samui weather forecast  and Ko samui climate

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