Koh Samui weather by month

Check out Koh Samui weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Koh Samui (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
84°F maximum daytime temperature in January in Koh Samui84
84°F maximum daytime temperature in February in Koh Samui84
86°F maximum daytime temperature in March in Koh Samui86
90°F maximum daytime temperature in April in Koh Samui90
90°F maximum daytime temperature in May in Koh Samui90
88°F maximum daytime temperature in June in Koh Samui88
88°F maximum daytime temperature in July in Koh Samui88
88°F maximum daytime temperature in August in Koh Samui88
88°F maximum daytime temperature in September in Koh Samui88
86°F maximum daytime temperature in October in Koh Samui86
84°F maximum daytime temperature in November in Koh Samui84
84°F maximum daytime temperature in December in Koh Samui84
Min temperature (night-time)
72°F minimum night-time temperature in January in Koh Samui72
73°F minimum night-time temperature in February in Koh Samui73
75°F minimum night-time temperature in March in Koh Samui75
77°F minimum night-time temperature in April in Koh Samui77
77°F minimum night-time temperature in May in Koh Samui77
75°F minimum night-time temperature in June in Koh Samui75
75°F minimum night-time temperature in July in Koh Samui75
75°F minimum night-time temperature in August in Koh Samui75
75°F minimum night-time temperature in September in Koh Samui75
73°F minimum night-time temperature in October in Koh Samui73
73°F minimum night-time temperature in November in Koh Samui73
72°F minimum night-time temperature in December in Koh Samui72
Heat & Humidity
High heat & humidity in January in Koh SamuiH
High heat & humidity in February in Koh SamuiH
Very high heat & humidity in March in Koh SamuiVH
Very high heat & humidity in April in Koh SamuiVH
Very high heat & humidity in May in Koh SamuiVH
Very high heat & humidity in June in Koh SamuiVH
Very high heat & humidity in July in Koh SamuiVH
Very high heat & humidity in August in Koh SamuiVH
Very high heat & humidity in September in Koh SamuiVH
High heat & humidity in October in Koh SamuiH
High heat & humidity in November in Koh SamuiH
High heat & humidity in December in Koh SamuiH
Sea temperature
82°F sea temperature in January in Koh Samui82
82°F sea temperature in February in Koh Samui82
84°F sea temperature in March in Koh Samui84
86°F sea temperature in April in Koh Samui86
86°F sea temperature in May in Koh Samui86
86°F sea temperature in June in Koh Samui86
84°F sea temperature in July in Koh Samui84
84°F sea temperature in August in Koh Samui84
84°F sea temperature in September in Koh Samui84
84°F sea temperature in October in Koh Samui84
82°F sea temperature in November in Koh Samui82
82°F sea temperature in December in Koh Samui82

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & Daylight in Koh Samui

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
12 hours of daylight per day in January in Koh Samui12
12 hours of daylight per day in February in Koh Samui12
12 hours of daylight per day in March in Koh Samui12
12 hours of daylight per day in April in Koh Samui12
13 hours of daylight per day in May in Koh Samui13
13 hours of daylight per day in June in Koh Samui13
13 hours of daylight per day in July in Koh Samui13
12 hours of daylight per day in August in Koh Samui12
12 hours of daylight per day in September in Koh Samui12
12 hours of daylight per day in October in Koh Samui12
12 hours of daylight per day in November in Koh Samui12
12 hours of daylight per day in December in Koh Samui12
UV Index (Maximum)
UV (maximum) index 11 (Extreme) in January in Koh Samui11
UV (maximum) index 11+ (Extreme) in February in Koh Samui11
UV (maximum) index 11+ (Extreme) in March in Koh Samui11
UV (maximum) index 11+ (Extreme) in April in Koh Samui11
UV (maximum) index 11+ (Extreme) in May in Koh Samui11
UV (maximum) index 11+ (Extreme) in June in Koh Samui11
UV (maximum) index 11+ (Extreme) in July in Koh Samui11
UV (maximum) index 11+ (Extreme) in August in Koh Samui11
UV (maximum) index 11+ (Extreme) in September in Koh Samui11
UV (maximum) index 11+ (Extreme) in October in Koh Samui11
UV (maximum) index 11 (Extreme) in November in Koh Samui11
UV (maximum) index 10 (Very High) in December in Koh Samui10

Rainfall in Koh Samui

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
10 days with some rainfall in January in Koh Samui10
5 days with some rainfall in February in Koh Samui5
5 days with some rainfall in March in Koh Samui5
8 days with some rainfall in April in Koh Samui8
17 days with some rainfall in May in Koh Samui17
16 days with some rainfall in June in Koh Samui16
17 days with some rainfall in July in Koh Samui17
17 days with some rainfall in August in Koh Samui17
17 days with some rainfall in September in Koh Samui17
20 days with some rainfall in October in Koh Samui20
19 days with some rainfall in November in Koh Samui19
13 days with some rainfall in December in Koh Samui13
Average monthly rainfall (inches)
4.8 inches monthly rainfall in January in Koh Samui4.8
1.5 inches monthly rainfall in February in Koh Samui1.5
2.1 inches monthly rainfall in March in Koh Samui2.1
3.3 inches monthly rainfall in April in Koh Samui3.3
6.8 inches monthly rainfall in May in Koh Samui6.8
4.6 inches monthly rainfall in June in Koh Samui4.6
5.7 inches monthly rainfall in July in Koh Samui5.7
5.4 inches monthly rainfall in August in Koh Samui5.4
5.6 inches monthly rainfall in September in Koh Samui5.6
10.8 inches monthly rainfall in October in Koh Samui10.8
18.2 inches monthly rainfall in November in Koh Samui18.2
7.4 inches monthly rainfall in December in Koh Samui7.4

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

  • 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

TravelbagHoliday deal finder

The climate guide for Thailand (Koh Samui) shows long term monthly 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.

What's the climate like in Koh Samui?

Koh Samui has a hot tropical climate with a short dry season.

Metric (°C)  |  Imperial (°F)

Back to top

Tropical storm risk: Koh Samui, Thailand typhoon season

% of month affected by tropical storms
0
0
0
0
0
0
0
0
0
1.2%
2.2%
<1%
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

TUI: up to 7% off holidays booked online

  • Book online with TUI & save up to 7% on holidays
  • FREE child places available for select holidays
  • Pay £0 deposits with direct debit & spread the cost
Go to TUI deal >>

View all TUI offers

TUITUI deal finder

Back to top

More about Thailand

Compare Koh Samui with the USA

Below the Koh Samui chart shows average maximum daytime temperature for Koh Samui, Thailand and the USA (Washington).

Maximum daytime temperature (°F)

Koh Samui, Thailand
USA (Washington)
84
41
84
45
86
55
90
66
90
75
88
84
88
88
88
86
88
79
86
68
84
57
84
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C)  |  Imperial (°F)

Compare more Koh Samui weather >>

Back to top

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^