Weather in Ko Samui in March 2025
Average weather
Average temperature in Ko Samui in March
The temperature in March is +26°C on average, with a range between a maximum of +27°C during the day and a minimum of +23°C at night.
The average maximum temperature goes up 25% by the end of the month, compared with the beginning of the month, from +26°C to +27°C.
Is Ko Samui warm or cold in March?
Ko Samui is typically warm in March.
Maximum temperatures go up compared to the previous month from +26°C to +27°C. The minimum temperature also goes up from +24°C to +25°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how March is compared to other months in Ko Samui:
Water temperature in Ko Samui in March
Water in Ko Samui in March is Very warm. It varies from +28°C to +30°C, with an average of +29°C. Note that the air temperature is lower than the water temperature, averaging around +27°C.
In March, water temperatures are average relative to the rest of the year:
Can you swim in Ko Samui in March?
Climate in Ko Samui in March
| February | March | April | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +26°C | +27°C | +27°C | ||||
| Min. temperature | ||||||
| +17°C | +21°C | +21°C | ||||
| Max. temperature | ||||||
| +32°C | +31°C | +33°C | ||||
| Rainfall | ||||||
| 29 mm | 60 mm | 86 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +28°C | +29°C | +30°C | ||||
| Humidity | ||||||
| 78% | 78% | 78% | ||||
| Air pressure | ||||||
| 1011 HPa | 1010 HPa | 1008 HPa | ||||
| Sunny days | ||||||
| 5 | 6 | 3 | ||||
| Cloudy days | ||||||
| 11 | 10 | 6 | ||||
| Rainy days | ||||||
| 11 | 11 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
March typically has worse weather conditions compared to February. It’s getting warmer as March arrives. The average maximum temperature goes up from +26°C to +27°C during the day. Prepare for more rain. Average rainfall goes from 29 mm to 60 mm. Humidity levels don’t change as the month goes on, averaging around 78%. The average wind speed doesn’t change much during March, staying around 3 m/s. The good news is there are likely to be more sunny days in March, from 5 to 6.
April brings much the same weather, it remains ok.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Ko Samui is gradually increasing during March, going from 3 m/s to 4 m/s over the course of the month.
Rain
How was the weather last March in Ko Samui?
Climate Change over Years
The climate in Ko Samui in March has not changed much over the last 43 years.
The average temperature was the lowest in 1986 (+26°C) and the highest in 2012 (+28°C). The driest year was 1997 with only 927 mm of rainfall, and the wettest year was 1999 with 1981 mm.
FAQ
Is March a good time to visit Ko Samui?
Can you sunbathe in Ko Samui in March?
Can you swim in Ko Samui in March?
Is Ko Samui rainy in March?
Is it sunny in Ko Samui in March?
Other cities in Thailand
Monthly weather in Ko Samui
Source of the data
For this page, we’ve looked at the typical weather in Ko Samui, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.