During the conference period, Bangkok’s weather is generally pleasant. Expect plenty of sunshine during the day and cooler temperatures at night.
Below is an overview of Bangkok’s typical climate in December, based on data from © WeatherSpark.com
Average High and Low Temperature in December in Bangkok

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures. [Ref: WeatherSpark.com]
Average Monthly Rainfall in December in Bangkok

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall. [Ref: WeatherSpark.com]
Humidity Comfort Levels in December in Bangkok
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The percentage of time spent at various humidity comfort levels, categorized by dew point. [Ref: WeatherSpark.com]
Sunrise & Sunset with Twilight in December in Bangkok

The solar day over the course of December. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. [Ref: WeatherSpark.com]