24Β° to 29Β°
Rain Tapers Off
Still catching the tail end of the rainy season, though showers are usually brief and the dry season is just around the corner.
β Light rain jacketπ¦ Insect repellent
25Β° to 29Β°
Driest & Coolest
The driest, most comfortable month of the year, with the lowest chance of rain and pleasantly cooler air.
βοΈ SunscreenποΈ Beach days
26Β° to 31Β°
Peak Dry Season
Still one of the driest months, though the heat is starting to build toward the hotter months ahead.
βοΈ Sunscreenπ₯΅ Stay hydrated
26Β° to 32Β°
Heat Builds
Dry season holds through April, but temperatures climb toward the year's peak.
π₯΅ Heat protectionβοΈ Sunscreen
26Β° to 33Β°
Monsoon's First Peak
The hottest month of the year meets the rainy season's opening burst: hot, sticky, and increasingly wet.
π₯΅ Heat protectionβ Light rain jacket
26Β° to 33Β°
Steady Showers
Rain is frequent but usually brief, and it is common to see long dry stretches between downpours.
β Umbrella handyπ¦ Insect repellent
25Β° to 32Β°
Calm Monsoon
One of the more forgiving rainy months, it can go a full week without rain, though the air stays hot and muggy.
β Umbrella handyπΆοΈ Sun and rain both
25Β° to 32Β°
Warm & Showery
Similar to July, showers come and go quickly and long dry, hot spells are common.
β Umbrella handyπ¦ Insect repellent
25Β° to 32Β°
Showers Continue
Rain remains frequent but rarely lingers long, typically clearing to sun within the same day.
β Umbrella handyπ¦ Insect repellent
24Β° to 31Β°
Rainy Peak Begins
The true rainy peak arrives, with heavier, more frequent downpours and a real risk of flooding.
β Heavy rain gearβ οΈ Flash-flood aware
24Β° to 29Β°
Torrential Peak
The wettest, stormiest month of the year, as the retreating monsoon dumps heavy rain and flooding becomes a real risk.
β Heavy rain gearβ οΈ Flash-flood aware
24Β° to 29Β°
Rains Begin Easing
Still wet and among the coolest months, but the worst of the rainy peak has passed.
β Light rain jacketπ¦ Insect repellent
β
β
β
peak season, β
β
β decent shoulder months, β
ββ true off-peak, based on rain frequency, heat, and haze.
Frequently asked questions
When is monsoon season in Ko Samui?›
Ko Samui's heaviest rain historically arrives October through December, with November the wettest, averaging around 445mm of rain across 16 days.
What is the best time of year to visit Ko Samui?›
February and March are historically Ko Samui's driest, sunniest months, though even in this stretch a stray shower can pass through.
What is the least favorable time to visit Ko Samui?›
October and November historically bring the true rainy peak, when the retreating monsoon can dump torrential, occasionally flooding rain on the island, November especially.
Which month has the most rain in Ko Samui?›
November is historically the wettest month, averaging around 445mm of rain across 16 days.
Which month is the driest in Ko Samui?›
February is historically the driest month, averaging around 66mm of rain.
How hot does Ko Samui get?›
May is historically the hottest month of the year.
What should I pack for Ko Samui during the rainy season?›
An umbrella and rain gear are worth having from around October through December, when the monsoon brings the bulk of the year's rain.
Does Ko Samui flood?›
The retreating monsoon has caused serious flooding on the east coast in past years, including a major island-wide flood in late 2016. Keep travel plans flexible if visiting October through December.
Is the Full Moon Party on Ko Samui?›
No. That famous beach party happens on neighboring Ko Pha Ngan. Speedboats run regularly from Samui's piers, usually a 20 to 30 minute ride.
Can I swim in Ko Samui during the rainy season?›
Yes. Sea temperatures hold between about 28 and 30Β°C every month, even in the wettest weeks, so the water itself is rarely the issue, the rain is.