Climate
Vietnam has tropical weather marked by the monsoon season. It is typically steamy and warm, although the weather can vary significantly from one area to another due to the length of the country which crosses many latitudes and the variance in altitudes - Vietnam is more mountainous than most people realise.
Temperature remains almost constant in Saigon while in Hanoi there is a marked cooler season (November through March) and warmer period during the summer.
Hanoi (north)
Spring: from February to April; average temperature is from 15°-25°C, drizzle is frequent with wet weather. This is the season of the Lunar New Year holiday and many folk festivals.
Summer: from May to August; average temperature is from 30°-36°C. There is a lot of rain and sunshine.
Autumn: from September to November; average temperature is 25°-30°C. It is cool, clear and dry. This is the best season in Hanoi, but is short, lasting no more than 50-60 days.
Winter: from December to January; the temperature is the lowest, from 10°-15°C, sometimes it can get as low as 5°-6°C with 100 per cent humidity rate. The weather is cloudy and wet. The monsoons cause many phases of cold.
The annual average rainfall in Hanoi is 1800mm.
Ho Chi Minh City(south)
Temperatures in the south and Ho Chi Minh City are fairly constant throughout the year (25ºC-30ºC). The climate in Ho Chi Minh City is distinctively seasonal. The dry season lasts from November to April, when there is much sunshine and dry wind. The average temperature is 26°C. The rainy season begins in May and ends in October characterised by sudden heavy rains. The hottest and most humid time is from the end of February until May.
Humidity is 80 per cent which is low when compared with other regions of the country.
The central coast is dry from June to October. The highlands are significantly cooler than the low lands, and temperatures can be freezing in winter.
In the rainy season there is the possibility of typhoons between July and November, affecting the north and central areas. In heavy wind and rain, stay indoors as flying debris may cause serious or even fatal injury. Flight schedules are frequently disrupted by typhoons. Ensure you check with the airline.
For weather details in Vietnam, please visit the World Meteorological Organization.
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