Koh Samui weather in April
Temperature, sea and sunshine in April: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in April
Excellent
Best time to visit: January – April
What is the weather like in Koh Samui in April?
In April, Koh Samui is hot: daytime highs average 30 °C, and even at night it stays warm at around 28 °C. The sea averages 30.2 °C – almost as warm as a bath. The sun shines for around 8 hours a day. Rain is frequent, with about 14 rainy days and 109 mm in total. On about 15 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, April is an excellent month for a holiday in Koh Samui.
April compared
How the weather changes from March to May. Tap a month to open it.
More details for April
- Daylight
- 12 h 20 min06:11 – 18:30
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 14 km/haverage daily peak
- Cloud cover
- 63 %on average
- Hot days
- 15 days30 °C or more
- Time zone
- UTC+7Asia/Bangkok
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %82 %
- Few rainy daysweight 20 %29 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in April
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Koh Samui in April: quick answers
Is Koh Samui hot in April?
Yes. In April, Koh Samui is hot: daytime highs average 30 °C and nights stay around 28 °C. On about 15 days the thermometer climbs to 30 °C or more.
Can you swim in Koh Samui in April?
Yes. In April the sea averages 30.2 °C – almost as warm as a bath.
Does it rain much in Koh Samui in April?
Rain is frequent, with about 14 rainy days and 109 mm in total.
Koh Samui month by month
The whole year in Koh SamuiAll destinations: ThailandWhere to go in AprilSea temperature in April
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)