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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.
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Average Weather and Climate Table for Surat Thani, Ko Samui |
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| Month |
Jan
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Feb
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Mar
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Apr
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May
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Jun
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Jul
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Aug
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Sep
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Oct
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Nov
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Dec
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Average temperature (oC) |
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| 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 |
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Average relative humidity (%) |
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| at 0700 am. | 87 | 87 | 87 | 87 | 87 | 84 | 84 | 84 | 87 | 91 | 91 | 87 |
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at 0100 pm. |
77 | 77 | 76 | 74 | 70 | 68 | 66 | 67 | 69 | 76 | 79 | 75 |
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Surface wind |
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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 |
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Direction |
east
|
southeast |
east
|
east
|
west
|
west
|
west
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west
|
west
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west
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east
|
east
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Average rainfall |
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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 |
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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 |
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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 |
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Visibility (km.) |
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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 |
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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