In April, northern Vietnam experiences a rise in temperature, resulting in hot yet not sweltering weather, while southern Vietnam remains scorching and humid with intense sunshine. Fortunately, precipitation remains low across the country, with rain falling only occasionally, and mostly in short bursts, posing little impact on travel.

Hot North vs. Scorching South

In April, the temperature gap between northern and southern Vietnam is gradually narrowing, with both regions entering a hot period. Specifically, the south gets more scorching, while the north is transitioning from mild spring to hot summer.

The north, Hanoi for instance, has stable low temperatures between 18 and 24 degrees Celsius (64 to 75 degrees Fahrenheit), creating a naturally temperate environment akin to an air-conditioned room. The high temperature climbs to 26 to 34℃ (79 to 93℉), bringing a sense of hot but not intense to discourage outdoor activities. This temperature range means you can wander around in most time of the day, with no need to worry about getting sunstroke.

The south experiences markedly higher temperatures compared to the north. In cities such as Ho Chi Minh City, daytime highs typically range from 31 to 37℃ (88 to 99℉), with the highest reaching up to 39℃ (102℉). Under these conditions, even brief outdoor exposure can result in excessive perspiration and significant discomfort, often prompting people to stay in air-conditioned places. For travelers planning to visit southern destinations, it is advisable to schedule outdoor activities during the early morning or late evening when the temperature is lower around 25 to 28℃ (77 to 82℉).

Ho Chi Minh City Night Market

Low Rainfall: Short-Lived Showers or Light Drizzle Mostly

Average Monthly Rainfall: 97mm
Average Rainy Days: 14

April is still a low-rainfall month, with most precipitation being short-lived showers or light drizzle.

In the south, the southwest monsoon brings a large amount of warm and moist air northward; interacting with the continuously rising temperature, it easily triggers short-lived showers. In Ho Chi Minh City, for instance, the rainfall in April increases to 50mm, with 5 rainy days. It is recommended to carry an umbrella when traveling to avoid being caught in sudden rain.

The north experiences more frequent convergence of cold and warm air masses, leading to a slightly higher number of rainy days compared to the south. In Hanoi, for instance, there are approximately 13 rainy days on average, with total rainfall amounting to around 90 mm. Precipitation predominantly falls in the early morning or afternoon, mainly as light rain or drizzle. If you go out during these rainy periods, you will see Hoan Kiem Lake shrouded in a fine mist, presenting a soft and ethereal landscape.

High Levels of Ultraviolet Radiation

In April, the ultraviolet index in Vietnam rises sharply, with the peak reaching over 11, which is already in the severe sun exposure category. In Ho Chi Minh City, the UV index is as high as 12. At this intensity, skin can get sunburned within just 30 minutes of exposure and eyes can also be damaged. Therefore, it is essential to take comprehensive sun protection measures when going out.