Weather in Ko Samui in April 2025
Average weather
Average temperature in Ko Samui in April
The temperature in April is +28°C on average, with a range between a maximum of +29°C during the day and a minimum of +25°C at night.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +27°C to +27°C.
Is Ko Samui warm or cold in April?
Ko Samui is typically warm in April.
Maximum temperatures go up compared to the previous month from +27°C to +27°C. The minimum temperature also goes up from +25°C to +25°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how April is compared to other months in Ko Samui:
Water temperature in Ko Samui in April
Water in Ko Samui in April is Very warm. It varies from +28°C to +32°C, with an average of +30°C. Note that the air temperature is lower than the water temperature, averaging around +27°C.
The water temperature in April is one of the warmest of the entire year:
Can you swim in Ko Samui in April?
Climate in Ko Samui in April
| March | April | May | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +27°C | +27°C | +28°C | ||||
| Min. temperature | ||||||
| +21°C | +21°C | +21°C | ||||
| Max. temperature | ||||||
| +31°C | +33°C | +34°C | ||||
| Rainfall | ||||||
| 60 mm | 86 mm | 116 mm | ||||
| Wind | ||||||
| 3 m/s | 2 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +29°C | +30°C | +30°C | ||||
| Humidity | ||||||
| 78% | 78% | 78% | ||||
| Air pressure | ||||||
| 1010 HPa | 1008 HPa | 1008 HPa | ||||
| Sunny days | ||||||
| 6 | 3 | 0 | ||||
| Cloudy days | ||||||
| 10 | 6 | 2 | ||||
| Rainy days | ||||||
| 11 | 12 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
April weather is still as ok as in March. The temperature levels stay the same in the area of +27°C for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 60 mm to 86 mm. Humidity levels don’t change as the month goes on, averaging around 78%. Winds are calmer in comparison to March, going down from 3 m/s to 2 m/s on average. The days becoming less sunny, going from 6 sunny days in March to 3 in April.
May brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Ko Samui is gradually decreasing during April, going from 4 m/s to 2 m/s over the course of the month.
Rain
How was the weather last April in Ko Samui?
Climate Change over Years
The climate in Ko Samui in April 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 April a good time to visit Ko Samui?
Can you sunbathe in Ko Samui in April?
Can you swim in Ko Samui in April?
Is Ko Samui rainy in April?
Is it sunny in Ko Samui in April?
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.