Weather in Koh Samui in February

How February compares

February is the 8th warmest month of the year in Koh Samui and ranks 20th of 134 destinations we compare for February - see where else is hot in February. Within Thailand it is 6th of 6 (Thailand in February). Against London's average high of 7.9°C in February, Koh Samui is 20.3°C warmer by day and 23.9°C warmer at night.

Daytime and night-time in February

The typical February day in Koh Samui peaks at 28.2°C, but that is an average: the warmest 10% of days reach 29.3°C or more. About 100% of days top 25°C and 1 in 37 pass 30°C. Nights average 25.9°C; one night in ten drops to 24.7°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest February day here reached 31.0°C (2020-02-17) and the coldest night 22.2°C (2000-02-05).

Rain in February

Some rain (4-8 rainy days): about 6 days with 1 mm or more, 35 mm in total. Year to year it varies a lot - the wettest February was 1999 with 198 mm, the driest 1993 with 1 mm. Humidity averages 76%, which makes the heat feel heavier than the thermometer suggests.

Sea temperature in February

The sea averages 28.2°C - warm enough to swim (22°c+). Depending on the year it ranges from 27.6°C to 28.6°C. For the warmest sea here, come in May (30.5°C).

Sunshine and daylight

Around 6.2 hours of sunshine a day (estimated from cloud cover), 11.7 hours of daylight: the sun rises about 06:40 and sets about 18:29 local time in mid-February. Average cloud cover is 47%.

Is February a good time to visit Koh Samui?

Yes - it is one of the better months: hot days, manageable rain. The best months for Koh Samui on our scoring are February, March, January; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Hot days, with little cooling after dark

The heat is fairly steady rather than extreme: days reach 30°C only 3% of the time, but humidity of 76% can make being active feel sticky. Plan more energetic outings for the morning and leave room for shade and breaks around midday. Loose, breathable clothes will be more useful than heavy layers, and evenings generally call for the same lightweight wardrobe as daytime. With average night lows of 25.9°C, do not count on a cool breeze to make sleeping comfortable; air conditioning is a sensible accommodation priority if you struggle with warm nights. February suits travellers who enjoy sustained warmth, but less so anyone hoping for crisp evenings.

Plenty of outdoor time, but keep plans flexible

Rain is a possibility rather than a reason to rule February out. About 6 rainy days means it is sensible to keep outdoor plans flexible, though the monthly pattern does not tell you when rain will arrive or how long it will last. Sunshine averages about 6.2 hours within 11.7 hours of daylight, so expect some cloud rather than uninterrupted blue skies. Keep sun protection handy even when it is cloudy, and pack a light waterproof for wet spells. The overall balance suits a holiday built around swimming and time outdoors, provided you are happy to adjust plans when the weather turns. February ranks alongside March and January among the island's best months.