Visitors to Ho Chi Minh City during the month of December should plan on bringing a t-shirt and shorts. The amount of rain is normal with an average of 34mm (1.3in). The average maximum temperature lies around 30.0°C (86°F). During the night it can be very warm as well. With a water temperature of around 27.0°C (80.6°F), this is a great month to swim. You will see the sun sometimes in this month, it has 121 hours of sun.