Lamai Beach Temperature by Month

Lamai Beach in Koh Samui, Thailand enjoys a stable climate, with daytime temperatures staying close to 30°C (86°F) throughout the year. Explore the full monthly breakdown below.

Year-round, Lamai Beach experiences a consistently comfortable climate. Maximum daytime temperatures range from a very warm 31°C (88°F) in May to a comfortable 29°C (84°F) in the coolest month, January. Nighttime temperatures range from 28°C (82°F) in May to 26°C (79°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Lamai Beach by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. May, the warmest month, sees 193 hours of sunshine.

The chart below shows the average temperature throughout the year:

Lamai Beach's average annual maximum temperature is 30°C (86°F). To put that in context, here's how it compares to a few well-known destinations:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.

Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters, and seasons reversed compared to Europe.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Lamai Beach, January is the coolest month, with average highs of 29°C (84°F) and humidity around 83%, considered very high. In May, the warmest month, temperatures average 31°C (88°F) with 80% humidity, conditions that feel very high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Lamai Beach this rarely lasts long on the ground.

For more on Lamai Beach's weather, including monthly rainfall, sunshine hours, and humidity, visit our Lamai Beach climate page.