Chiang Mai Temperature by Month

Chiang Mai in Chiang Mai Province, Thailand sees moderate seasonal temperature shifts, with daytime highs between 30°C (86°F) in December and 38°C (100°F) in April, averaging 33°C (91°F) annually. Explore the full monthly breakdown below.

In Chiang Mai, seasonal changes bring about a moderate variation in temperatures. Nighttime lows range from 24°C (75°F) in April to 15°C (59°F) in December.

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

The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. April, the city's warmest month, averages 280 hours of sunshine.

The chart below shows the average temperature throughout the year:

Chiang Mai's average annual maximum temperature is 33°C (91°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

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.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

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 Chiang Mai, December 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 38°C (100°F) with 57% humidity, conditions that feel moderate. 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 Chiang Mai this rarely lasts long on the ground.

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