This report describes the typical weather at the Noi Bai International Airport (Hanoi, Vietnam) weather station over the course of an average August. It is based on the historical records from 1992 to 2012. Earlier records are either unavailable or unreliable.
Hanoi has a warm temperate climate with dry winters and hot summers. The area within 25 mi of this station is covered by croplands (91%), grasslands (4%), and lakes and rivers (3%).
The month of August is characterized by essentially constant daily high temperatures, with daily highs around 90Â°F throughout the month, exceeding 95Â°F or dropping below 85Â°F only one day in ten.
Over the course of August, the length of the day is gradually decreasing. The shortest day of the month is August 31 with 12:34 hours of daylight; the longest day is August 1 with 13:05 hours of daylight.
The earliest sunrise is at 5:31am on August 2; the latest sunset is at 6:36pm on August 1; the latest sunrise is at 5:40am on August 31; the earliest sunset is at 6:14pm on August 31.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 88% (mostly cloudy) and does not vary substantially over the course of the month.
On August 16, a representative day, the sky is clear or mostly clear 10% of the time, partly cloudy 13% of the time, and mostly cloudy or overcast 67% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around August 1, occurring in 69% of days. Precipitation is least likely around August 31, occurring in 62% of days.
Throughout August, the most common forms of precipitation are thunderstorms, moderate rain, and light rain.
Thunderstorms are the most severe precipitation observed during 70% of those days with precipitation. They are most likely around August 3, when it is observed during 51% of all days.
Moderate rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around August 31, when it is observed during 13% of all days.
Light rain is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around August 31, when it is observed during 9% of all days.
Either snow is exceptionally unlikely to fall at this location in August or this station does not reliably report precipitation types.
The relative humidity typically ranges from 65% (mildly humid) to 98% (very humid) over the course of a typical August, rarely dropping below 53% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around August 29, at which time the relative humidity drops below 71% (humid) three days out of four; it is most humid around August 21, rising above 95% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical August, the dew point typically varies from 74Â°F (very muggy) to 82Â°F (very oppressive) and is rarely below 71Â°F (muggy) or above 85Â°F (very oppressive).
Over the course of August typical wind speeds vary from 0 mph to 10 mph (calm to gentle breeze), rarely exceeding 16 mph (moderate breeze).
The highest average wind speed of 5 mph (light breeze) occurs around August 1, at which time the average daily maximum wind speed is 10 mph (gentle breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around August 30, at which time the average daily maximum wind speed is 10 mph (gentle breeze).