Koh Samet Temperature by Month

Koh Samet in Rayong Province, Thailand enjoys a stable climate, with daytime temperatures staying close to 31°C (88°F) throughout the year. Explore the full monthly breakdown below.

The temperature in Koh Samet remains steady throughout the year, providing a consistently very warm climate. Maximum daytime temperatures range from a very warm 31°C (88°F) in April to a very warm 30°C (86°F) in January. Nights are mild year-round, with lows ranging from 27°C (81°F) in April to 25°C (77°F) in January.

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

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. April, the city's warmest month, sees 210 hours of sunshine.

The chart below shows the average temperature throughout the year:

Koh Samet's average annual maximum temperature is 31°C (88°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Queenstown, New Zealand averages 10°C (50°F) annually, remember seasons are flipped, so its coldest months fall in June and July.

Beijing, China averages 20°C (68°F) annually, but with big seasonal swings, very cold winters and hot summers.

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 Koh Samet, January is the coolest month, with average highs of 30°C (86°F) and humidity around 73%, considered high. In April, the warmest month, temperatures average 31°C (88°F) with 77% humidity, conditions that feel 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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

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