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Koh Samui
© Angelika Bentin / age fotostock
Koh Samui (Thailand)
All overall Average 64%6%16%92%84%60%
Best month January Good
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Weather Forecast Koh Samui

Situated in the south part of the Kra land bridge, Koh Samui is one of the three most important islands in Thailand. Unlike much of the rest of the south, Koh Samui enjoys a relatively dry climate throughout the year interjected in the months of October and November by a short rainy season and by a cooler period at the end of autumn. The average temperature is 23°C and the number of hours of sunshine changes between 5 and 10. The best time to discover Koh Samui is between the omnths of February and May - the rest of the year is more uncertain weather-wise.

The weather prediction service inKoh Samui is based on a calculation which takes into account historic data from the last 10 years, as well as predictions based on certain criteria such as air temperature, humidity, water temperature, wind speed and sunshine.

Prepare your things now for your stay by taking a look at the weather predictions forKoh Samui.

  • Temperature
  • Bad weather
  • Sunbathing
  • Swimming
  • Wind
  • Humidity

The weather is rated on a scale from 0 to 100, with the worst weather conditions ranging between 0 and 19 and the best ranging above 79.
The overall weather comfort index is:

  • Excellent (Rating between 80% and 100%)
  • Good (Rating between 60% and 79%)
  • Average (Rating between 40% and 59%)
  • Bad (Rating between 20% and 39%)
  • Very bad (Rating between 0% and 19%)

Practical advice for a stay inKoh Samui:

  • Light clothes for the daytime and at night
  • A light scarf to protect the shoulders and an umbrella
  • A waterproof jacket for rainy days

Koh Samui: When to go ?

  •  
  • Daytime temperature
  • Night-time temperature
  • Daytime humidity
  • Night-time humidity
  • Daytime wind
  • Night-time wind
  • Daytime rainfall
  • Night-time rainfall
  • Sunshine
  • Swimming
  • January 27.9°C 25.5°C 74.0% 81.8% 4.5m/s 4.0m/s 46.7mm 50.5mm 17.5 27.7°C
  • February 28.5°C 25.9°C 73.9% 83.0% 3.8m/s 3.5m/s 32.2mm 36.7mm 18.1 28.1°C
  • March 29.1°C 26.7°C 75.4% 84.3% 3.5m/s 3.3m/s 51.0mm 55.6mm 18.1 28.9°C
  • April 30.0°C 27.4°C 75.4% 85.1% 2.9m/s 2.9m/s 64.7mm 68.8mm 15.4 30.0°C
  • May 29.5°C 27.1°C 77.4% 86.7% 4.1m/s 4.2m/s 102.8mm 77.2mm 3.9 30.2°C
  • June 29.4°C 26.9°C 76.8% 86.1% 4.7m/s 4.7m/s 77.0mm 57.5mm 3.8 29.7°C
  • July 29.1°C 26.8°C 76.8% 85.7% 5.2m/s 5.0m/s 80.0mm 55.7mm 3.1 29.5°C
  • August 29.0°C 26.7°C 77.1% 86.0% 5.7m/s 5.5m/s 85.4mm 60.0mm 1.3 29.2°C
  • September 28.7°C 26.3°C 78.6% 87.9% 4.5m/s 4.5m/s 102.2mm 72.7mm 2.6 29.2°C
  • October 28.1°C 25.8°C 81.5% 89.2% 3.6m/s 3.3m/s 134.8mm 144.5mm 4.1 29.1°C
  • November 28.0°C 26.0°C 78.6% 84.3% 4.6m/s 4.1m/s 110.8mm 147.1mm 6.8 28.8°C
  • December 27.8°C 25.6°C 75.5% 81.7% 5.0m/s 4.3m/s 84.8mm 108.6mm 10.1 28.2°C
   
Weather Koh Samui : Annual weather forecast chart

Koh Samui: Seven-day weather forecast

  • Sunday 15 September 2019 Koh Samui stormy 25°C | 28°C
    • Rainfall: 18
    • Wind: Force 21 Direction W
    • Sun: Indicator 2 06:09:00 18:20:00
    • Moon: 19:17:00 06:52:00
  • Monday 16 September 2019 Koh Samui storm risk 25°C | 29°C
    • Rainfall: 7
    • Wind: Force 20 Direction W
    • Sun: Indicator 40 06:09:00 18:20:00
    • Moon: 19:56:00 07:36:00
  • Tuesday 17 September 2019 Koh Samui storm risk 26°C | 30°C
    • Rainfall: 6
    • Wind: Force 19 Direction W
    • Sun: Indicator 48 06:09:00 18:19:00
    • Moon: 20:35:00 08:21:00
  • Wednesday 18 September 2019 Koh Samui storm risk 26°C | 29°C
    • Rainfall: 17
    • Wind: Force 16 Direction W
    • Sun: Indicator 28 06:09:00 18:19:00
    • Moon: 21:15:00 09:07:00
  • Thursday 19 September 2019 Koh Samui storm risk 26°C | 29°C
    • Rainfall: 6
    • Wind: Force 15 Direction W
    • Sun: Indicator 21 06:09:00 18:18:00
    • Moon: 21:58:00 09:55:00
  • Friday 20 September 2019 Koh Samui storm risk 26°C | 31°C
    • Rainfall: 1
    • Wind: Force 15 Direction W
    • Sun: Indicator 70 06:09:00 18:17:00
    • Moon: 22:45:00 10:45:00

Thailand: Seven-day weather forecast

Take a look at the seven-day weather forecast for the principal cities inThailand. For each destination, Easyvoyage's weather tool gives you temperature and rainfall indicators, along with wind force and direction and sunrise/sunset times. Prepare your holidays using our weather forecasts or organise your activities thanks to the weather comfort index forThailand. Whether you're getting ready to go or already on holiday, it's never been simpler to keep an eye on the weather than with Easyvoyage!