Ban Mae Nam Temperature by Month

The average annual maximum temperature in Ban Mae Nam, Koh Samui, Thailand is 30°C (86°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how Ban Mae Nam compares to cities worldwide.

Year-round, Ban Mae Nam 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 Ban Mae Nam 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:

Ban Mae Nam'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.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation, summers are often cool and foggy, winters mild.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

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 Ban Mae Nam, 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.

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 Ban Mae Nam this rarely lasts long on the ground.

For more on Ban Mae Nam's weather, including monthly rainfall, sunshine hours, and humidity, visit our Ban Mae Nam climate page.