Koh Samui Temperature & Weather: All Months Guide 2025
1649142847 1516800491 bangkok watarun 1 1200x750.jpg.jpg?w=60&h=60&dpr=1
Top Selling Thailand Tour Packages

Koh Samui Weather

Golden sand, azure water, aqua blue sky, and Koh Samui weather, take this heavenly little isle of Thailand to another level. Thailand is home to some of the most pristine islets, yet one destination which stands out is Koh Samui. No matter how many attractions and unexplored charms it holds, Koh Samui's temperature is one big facet that overshadows all of its other attractions. Known for its quaint ambiance, Koh Samui is a gracious host to numerous tourists from all around the world and all year!

Be it spine-tingling adventures, pleasurable explorations, shopping sprees, street-side tidbits, spa and sauna facilities, or simple sunbathing sessions, Koh Samui comes loaded with all these in all seasons. The climate in Koh Samui during January complements the celebratory mood of visitors. The weather enhances the overall experience of the visitors during November and December. Each month in Koh Samui spoils visitors with unending choices and diversions. Below is a listing of what to expect in Koh Samui every month.



Koh Samui Weather in January



New year in a sandy and splashy destination like Koh Samui is like a dream come true for many tourists. The pastel-hued skies and the benign Koh Samui temperature offers an ideal getaway against the freezing and unexciting destinations.

The average temperature
in January is 28 °C to 24 °C, making days exuberant and nights even more thrilling. The climate during the whole of January remains pleasantly warm, with an average precipitation of 147.7 mm. The occasional downpour refreshes the islet and offers visitors a greeny-swathed view. Hence, the climate during January is an ideal time for tourists, who wish to witness the awe-inspiring beauty of this islet. 

Average Maximum Temperature: 26 °C

Average Precipitation: 147.7 mm

Temperature Range: 28°C - 24°C 

Koh Samui Weather in February


The climate in Koh Samui in February witnesses a great relief with the rays of sunshine falling upon this islet. The average Koh Samui temperature in February is  25 °C to 29 °C, making day adventures fun and enthralling for tourists.

Whether one wishes to soak in the sun or plans on trying out adventure sports, the climate over here during February is ideal for all kinds of ventures. The average precipitation in Koh Samui during February is 56.4mm, making it the least rain receiving a month. The weather in February is a major crowd-puller, as tourists can enjoy a refreshing getaway with perfect sunsets, day jaunts, and much more.

Average Maximum Temperature: 27°C

Average Precipitation: 56.4 mm

Temperature Range: 29 °C - 25°C

Koh Samui Weather in March



The temperature over here gets a bit hiked up in March. The average temperature during March is 24°C to 29 °C. The climate over here is majorly warm in this month with lots of sunshine and humidity rising from 63% to 91%.

As the month of March brings a rise in temperature, the islet is visited by adventure freaks in huge numbers. The climate in Koh Samui during this time makes it the peak season for diving and snorkelling.  The average precipitation in Koh Samui is 91mm, whereby visitors can enjoy sunny days with some occasional downpours. 

Average Maximum Temperature: 29°C

Average Precipitation: 91 mm

Temperature Range: 29°C - 24°C

Koh Samui Weather in April



The climate is hot in Koh Sumai during April, with fewer tourists opting for day outs. However, the temperature gets a little pleasant and moderate when the sun goes down. April is the time when most tourists look forward to water sports and indoor or evening recreations, as the average temperature becomes 25°C to 30° C.

 The average precipitation in this season sees a downslide of 81.9 mm. Apart from the rise in the temperature, April is the month for important festivals like Koh Samui Triathlon and LGBT Pride Festival. 

Average Maximum Temperature: 29°C

Average Precipitation: 81.9 mm

Temperature Range: 30°C - 25°C

Koh Samui Weather in May



The paradisal islet of Thailand in May experiences the hottest days. However, the hot climate still doesn’t stop some explorers from landing at this magical destination. The average temperature during May is 25°C to 30°C, whereby tourists can take up sailing spree and admire the exquisite views during dusk. 

The average precipitation in Koh Samui during May is 128.2 mm. The hot climate and heavy rains lead to more humidity, with averages between 62% to 92%. The sultry temperature during the days, enable tourists to experience the intoxicating nightlife of the island at its best.

Average Maximum Temperature: 30°C

Average Precipitation: 128.2 mm

Temperature Range: 30°C - 25°C

Koh Samui Weather in June



The climate remains fairly hot with less rain during June in Koh Samui. The days become longer, which encourages tourists to go for outdoor activities. Average Koh Samui temperature during June remains between 24°C to 30°C. With average precipitation being 117.6mm, the climate experiences a decline in humidity between 61% and 90%. The warm temperature and the increased motion in the sea make June the best time for surfers and sailors. 

Average Maximum Temperature: 29°C

Average Precipitation: 117.6 mm

Temperature Range: 29°C  - 24°C

Koh Samui Weather in July



While the remaining of Thailand is all drenched in rains, there is a lot more that one can expect from the utopian island, apart from the lovely climate in Koh Samui during July. The average temperature in July sees a drop, being between 24°C to 29°C.

However, with a decrease in average precipitation, the atmosphere becomes less humid. The sporadic showers work well to revive the splendid expanses of the island. The warmer temperature results in warmer seawater, making it an ideal season for surfing, sailing, and diving.

Average Maximum Temperature: 29.25°C

Average Precipitation: 115.2 mm

Temperature Range: 29 - 24°C

Koh Samui Weather in August



Sunny days and increased sprinkle, is what one can look up to during a vacation in August at Koh Samui. The climate is fairly sunny in this month with little drizzles in the afternoon. The average temperature in August remains between 24°C to 30°C. The average precipitation is 103.9mm, with a moderate level of humidity between 61% and 88%.

Tourists opting for a vacation in August are welcomed with longer days, less crowd and balmy temperature. The climate during August encourages tourists to be out for most of the day. However, the erratic rainfalls are just an added attraction during this time, even when one decides to remain indoors.

Average Maximum Temperature: 29.25°C

Average Precipitation: 103.9 mm

Temperature Range: 30°C  - 24°C

Koh Samui Weather in September



The gorgeous little islet of Thailand charms up every visitor with its beauty, as it enters in autumn months. The climate during September is mellow and mild as compared to the sunny days of July and August. The average temperature remains between 25°C to 31°C, with average precipitation being 114.9mm. 

September in this islet is a spectacle to different sporty events and festivals. The pleasurable climate in September when coupled with fancy sports, delectable cuisines, and night shows, make a vacation in this heavenly isle a complete bliss. The reduced temperature and exciting marine conditions are a big temptation for adventure-enthusiasts all round the world. And while Koh Samui is a hub of tourists during this time, peace-seekers have their own share of perks for visiting this destination.

Average Maximum Temperature:
28°C

Average Precipitation: 103.9 mm

Temperature Range: 25°C - 31°C

Koh Samui Weather in October



The Koh Samui temperature during October remains a bit cloudy. The average temperature remains between 23°C to 28°C, with average precipitation rising to 246.9 mm. This is also the time when humidity lies between 65% and 93%. The romantic weather fascinates most honeymooners and couples to spend their first vacation together at Koh Samui.

A myriad of opportunities exists for couples to have the time of their life at this incredible island. No matter how much rain this magnetizing isle receives, the climate over here remains moderate without dropping too drastically. 

Average Maximum Temperature:
27°C

Average Precipitation: 246.9 mm

Temperature Range: 28°C - 23°C

Koh Samui Weather in November



As November arrives, the climate over here becomes mostly wet and humid. The temperature in November remains between  23°C to 28°C. November also brings an increase in rainfall, with average precipitation rising to 407.2 mm and humidity rising to 70% and 94%.

The climate during November is never a disappointment for surfers and adventure junkies, as this is the time when waves rise to their highest level. The soothing climate over here during November comes packed with several other perks such as reduced rates on spa and massages, cheaper accommodation options and peaceful beaches with less crowd. 

Average Maximum Temperature: 29°C

Average Precipitation: 407.2  mm

Temperature Range: 28°C - 23°C

Koh Samui Weather in December



With Christmas and New Year approaching, the climate over here gets back to its normal state during December. The temperature in December remains between  23°C to 27°C. December witnesses a drastic reduction in average precipitation with 234.1 mm. 

With some days cloudy, some rainy and some sunny, December gives tourists a taste of all the weather. The climate in Koh Samui in December is an idyllic time for families, couples, peace-seekers, surfers, adventure enthusiasts, and basically everyone! Be it dining options, shopping sprees, or day outs, the awesome temperature in December is ideal for every kind of tourists visiting Koh Samui. 

Average Maximum Temperature: 27°C

Average Precipitation: 234.1  mm

Temperature Range: 23°C - 27°C
Image description
Bigger Group? Get special offers upto 50% off!
We create unforgettable adventures, customised for your group.
Connect with a group tour expert
Full Name
Email
Phone number
Travel Date
Traveller Count
Message
Koh Samui Tour Packages Explore All (11)
Explore All (11)
Adventure Explore All (9)
Explore All (9)
Day Tours Explore All (7)
Water Sports Explore All (5)
Explore All (12)
Newly Added Koh Samui Experience

Koh Samui Top Attractions

Places To Visit In Koh Samui

Popular Nearby Places Around Koh Samui

Popular Related Destinations

International Things to Do

Currency Picker
Commonly Used Currencies
INR -
Indian Rupee
USD - $
United States Dollar
EUR -
Euro
SGD - $
Singapore Dollar
AUD - $
Australian Dollar
GBP - £
British Pound
AED - د.إ
United Arab Emirates Dirham
All Other Currencies
ALL - L
Albanian Lek
AMD - դր.
Armenian Dram
ARS - $
Argentine Peso
AWG - ƒ
Aruban Florin
BBD - $
Barbadian Dollar
BDT -
Bangladeshi Taka
BMD - $
Bermudian Dollar
BND - $
Brunei Dollar
BOB - Bs.
Bolivian Boliviano
BSD - $
Bahamian Dollar
BWP - P
Botswana Pula
BZD - $
Belize Dollar
CAD - $
Canadian Dollar
CHF - CHF
Swiss Franc
CNY - ¥
Chinese Renminbi Yuan
COP - $
Colombian Peso
CRC -
Costa Rican Colón
CZK -
Czech Koruna
DKK - kr.
Danish Krone
DOP - $
Dominican Peso
DZD - د.ج
Algerian Dinar
EGP - ج.م
Egyptian Pound
ETB - Br
Ethiopian Birr
FJD - $
Fijian Dollar
GHS -
Ghanaian Cedi
GIP - £
Gibraltar Pound
GMD - D
Gambian Dalasi
GTQ - Q
Guatemalan Quetzal
GYD - $
Guyanese Dollar
HKD - $
Hong Kong Dollar
HNL - L
Honduran Lempira
HRK - kn
Croatian Kuna
HTG - G
Haitian Gourde
HUF - Ft
Hungarian Forint
IDR - Rp
Indonesian Rupiah
ILS -
Israeli New Sheqel
JMD - $
Jamaican Dollar
KES - KSh
Kenyan Shilling
KGS - som
Kyrgyzstani Som
KHR -
Cambodian Riel
KYD - $
Cayman Islands Dollar
KZT -
Kazakhstani Tenge
LAK -
Lao Kip
LBP - ل.ل
Lebanese Pound
LKR -
Sri Lankan Rupee
LRD - $
Liberian Dollar
LSL - L
Lesotho Loti
MAD - د.م.
Moroccan Dirham
MDL - L
Moldovan Leu
MKD - ден
Macedonian Denar
MMK - K
Myanmar Kyat
MNT -
Mongolian Tögrög
MOP - P
Macanese Pataca
MUR -
Mauritian Rupee
MVR - MVR
Maldivian Rufiyaa
MWK - MK
Malawian Kwacha
MXN - $
Mexican Peso
MYR - RM
Malaysian Ringgit
NAD - $
Namibian Dollar
NIO - C$
Nicaraguan Córdoba
NOK - kr
Norwegian Krone
NPR - Rs.
Nepalese Rupee
NZD - $
New Zealand Dollar
PEN - S/
Peruvian Sol
PGK - K
Papua New Guinean Kina
PHP -
Philippine Peso
PKR -
Pakistani Rupee
QAR - ر.ق
Qatari Riyal
RUB -
Russian Ruble
SAR - ر.س
Saudi Riyal
SCR -
Seychellois Rupee
SEK - kr
Swedish Krona
SLL - Le
Sierra Leonean Leone
SOS - Sh
Somali Shilling
SVC -
Salvadoran Colón
SZL - E
Swazi Lilangeni
THB - ฿
Thai Baht
TTD - $
Trinidad and Tobago Dollar
TZS - Sh
Tanzanian Shilling
UYU - $U
Uruguayan Peso
UZS - so'm
Uzbekistan Som
YER -
Yemeni Rial
ZAR - R
South African Rand
JPY - ¥
Japanese Yen
VND -
Vietnamese dong