The hottest month in Vietnam is May when the average maximum temperature is 33°, average temperature is 30° and average minimum temperature is 26°.
The coolest month in Vietnam is January when the average maximum temperature is 27°, average temperature is 24° and average minimum temperature is 21°.
The longest days in Vietnam are in June, with an average of 12.8 hours of daylight per day. December has the shortest days with an average of 11.4 hours of daylight per day.
The sunniest days in Vietnam are in April which has the most hours of sunshine per day with an average of 7 hours of sunshine per day, making it a quite sunny month with some cloud cover. January has the least sunshine with an average of 5.1 hours of sunshine per day, making it a sunny month that is overcast at times.
The ultraviolet index is the highest in April when it reaches 14.6 and lowest in December when it reaches 10.
An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The warmest sea water temperatures in Vietnam are found in June when they peak at 29° and lowest in January when they dip to 25°.
The sea is best for swimming between April and December when the temperature is above 27° which is very warm and ideal for relaxing and swimming for the whole day.
The wettest month in Vietnam is October with 126.8cm of rain and November has the most days of rain with 18 days with some rain, a very wet time to visit the beach.
The driest month in Vietnam is February with 3.4cm of rain and the least days of rain with 3.4 days with some rain, a very dry time to visit the beach.
The most humid month in Vietnam is May with a dew point (an indicator of humidity) of 26° which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.
The least humid month in Vietnam is January with a dew point of 20° which is somewhat uncomfortable for most people in cities but fine on a beach.
The most windy month in Vietnam is November when the average maximum windspeed is 25kmh and the average wind speed is 10kmh.
The least windy month in Vietnam is April when the average maximum windspeed is 20kmh and the average wind speed is 7kmh.