Koh Samui weather in April 2025

Expect 32°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Koh Samui in April. Check more long-term weather averages for Koh Samui in April before you book your next holiday to Thailand in 2025/2026.

32
32°C max day temperature
8
8 hours of sunshine per day
8
8 days with some rainfall
25
25°C min night temperature
12
12 hours of daylight per day
VH
Very High heat & humidity
85
85 mm of monthly rainfall
11
11+ (Extreme) UV index
30
30°C sea temperature

More about Koh Samui

Koh Samui by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Thailand

Travelbag: Latest holiday sale offers worldwide

Sale

Explore latest sale offers on holidays in 2024/2025
Filter deals by continent, star rating & holiday type
Including Dubai, Caribbean, North America, Asia & Pacific

Go to Travelbag deal >>

View all Travelbag offers

Holiday deal finder

Destination

The April weather guide for Thailand (Koh Samui) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

More about Thailand

How hot is it in Koh Samui in April?

Daytime temperatures usually reach 32°C in Koh Samui in April with very high heat and humidity, falling to 25°C at night.

How sunny is it in Koh Samui in April?

There are normally 8 hours of bright sunshine each day in Koh Samui in April - that's 64% of daylight hours.

How warm is the sea around Koh Samui in April?

The average sea temperature around Koh Samui in April is 30°C.

Does it rain in Koh Samui in April?

There are usually 8 days with some rain in Koh Samui in April and the average monthly rainfall is 85mm.

Koh Samui April sunrise & sunset times

Browse the sunrise and sunset times for Koh Samui in April 2025. Select a month to view Koh Samui sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Tuesday, 1st April 2025	06:17	18:30
Tuesday, 15th April 2025	06:10	18:30
Wednesday, 30th April 2025	06:03	18:31

Be inspired

Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers

We promise not to share your details

Popular travel offers

Thailand - quick facts
Flight time^✝	15 hours
Time difference	UK +7 hours
Language(s)	Thai, Isan
Currency	Thai Baht
Electricity	A + B + C + O plug (230V)
Driving side	Left
Why visit?	Beaches Culture Nature Nightlife
Tourist info	Tourism Authority of Thailand