Koh Samui Weather by Month — Temperature & Rainfall Guide

Koh Samui is a region in Thailand. Many people wonder what the weather conditions are in Koh Samui over the year. What is the best time to visit Koh Samui?

This page shows the average weather conditions by month in Koh Samui over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

In January the weather in Koh Samui is generally excellent. The temperatures range from high in Chaweng Beach with 28°C (82°F) to very high in Suratthani with 31°C (88°F).

Find more detailed climate information for Koh Samui in January here.

In February the weather in Koh Samui is generally excellent. The temperatures range from high in Chaweng Beach with 29°C (84°F) to very high in Suratthani with 33°C (91°F).

Find more detailed climate information for Koh Samui in February here.

In March the weather in Koh Samui is generally very good. The temperatures range from high in Chaweng Beach with 30°C (86°F) to very high in Suratthani with 34°C (93°F). These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Koh Samui in March here.

In April the weather in Koh Samui is generally good. The average maximum daytime temperatures are very high and range from 30°C (86°F) in Chaweng Beach to 35°C (95°F) in Suratthani. These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Koh Samui in April here.

In May the weather in Koh Samui is generally good. The average maximum daytime temperatures are very high and range from 31°C (88°F) in Chaweng Beach to 34°C (93°F) in Suratthani. These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Koh Samui in May here.

In June the weather in Koh Samui ranges from good in Chaweng Beach to very good in Lamai Beach. The average maximum daytime temperatures are very high and range from 31°C (88°F) in Chaweng Beach to 33°C (91°F) in Suratthani. These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Koh Samui in June here.

In July the weather in Koh Samui ranges from good in Bophut to very good in Chaweng Beach. The average maximum daytime temperatures are very high and range from 30°C (86°F) in Chaweng Beach to 33°C (91°F) in Suratthani. These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Koh Samui in July here.

In August the weather in Koh Samui ranges from good in Chaweng Beach to very good in Lamai Beach. The average maximum daytime temperatures are very high and range from 30°C (86°F) in Bophut to 33°C (91°F) in Suratthani. These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Koh Samui in August here.

In September the weather in Koh Samui is generally good. The temperatures range from high in Chaweng Beach with 30°C (86°F) to very high in Suratthani with 32°C (90°F). These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Koh Samui in September here.

In October the weather in Koh Samui is generally less favorable. The temperatures range from high in Bophut with 29°C (84°F) to very high in Suratthani with 31°C (88°F). These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Koh Samui in October here.

In November the weather in Koh Samui is generally less favorable. In Chaweng Beach you can expect warm maximum average daytime temperatures around 29°C (84°F) and nighttime temperatures around 26°C (79°F). These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Koh Samui in November here.

In December the weather in Koh Samui is generally very good. In Chaweng Beach you can expect warm maximum average daytime temperatures around 29°C (84°F) and nighttime temperatures around 26°C (79°F).

Find more detailed climate information for Koh Samui in December here.