Chiang Mai is typically warm in December.

Maximum temperatures go down compared to the previous month from +86°F to +84°F. The minimum temperature also goes down from +68°F to +63°F.

It’s generally warm, but pack a long-sleeve shirt for evenings.

December is the coldest month in Chiang Mai, here is the comparison with other months:

December often has better weather than November. It’s getting colder in December. From +86°F in the day, the average maximum temperature lowers to +84°F. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 26 mm to 10 mm. It feels drier, as humidity decreases from 73% to 70%. The average wind speed doesn’t change much during December, staying around 0 m/s. The good news is there are likely to be more sunny days in December, from 12 to 18.

January brings much the same weather, it remains great.

The climate in Chiang Mai in December has not changed that much over the last 43 years.

The average temperature was the lowest in 2011 (+88°F) and the highest in 1998 (+93°F). The driest year was 1998 with only 604 mm of rainfall, and the wettest year was 1994 with 1462 mm.

For this page, we’ve looked at the typical weather in Chiang Mai, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.