Chaweng Beach Temperature by Month

Chaweng 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, Chaweng Beach experiences a consistently comfortable climate. Maximum daytime temperatures range from a very warm 31°C (88°F) in May to a comfortable 28°C (82°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 Chaweng Beach by month:

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. May, the city's warmest month, gets 193 hours of sunshine.

The chart below shows the average temperature throughout the year:

Chaweng 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:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

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

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

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 Chaweng Beach, January is the coolest month, with average highs of 28°C (82°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.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

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