This report describes the typical weather at the Yangon International Airport (Yangon (Rangoon), Myanmar (Burma)) weather station over the course of an average September. It is based on the historical records from 2000 to 2012. Earlier records are either unavailable or unreliable.
Yangon (Rangoon) has a tropical monsoon climate with short dry season. The area within 25 mi of this station is covered by croplands (85%), oceans and seas (5%), forests (3%), built-up areas (3%), and lakes and rivers (2%).
The month of September is characterized by essentially constant daily high temperatures, with daily highs around 87°F throughout the month, exceeding 92°F or dropping below 82°F only one day in ten.
Over the course of September, the length of the day is essentially constant. The shortest day of the month is September 30 with 11:60 hours of daylight; the longest day is September 1 with 12:27 hours of daylight.
The earliest sunrise is at 5:52am on September 2; the latest sunset is at 6:19pm on September 1; the latest sunrise is at 5:55am on September 30; the earliest sunset is at 5:55pm on September 30.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover ranges from 78% (partly cloudy) to 93% (mostly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 14% from the start to the end of the month.
On September 30, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 36% of the time, and overcast or mostly cloudy 49% of the time.
On September 1, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 86% of the time, and clear or mostly clear 2% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around September 1, occurring in 89% of days. Precipitation is least likely around September 30, occurring in 74% of days.
Throughout September, the most common forms of precipitation are thunderstorms, moderate rain, and light rain.
Thunderstorms are the most severe precipitation observed during 45% of those days with precipitation. They are most likely around September 19, when it is observed during 39% of all days.
Moderate rain is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around September 1, when it is observed during 29% of all days.
Light rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around September 3, when it is observed during 13% of all days.
Either snow is exceptionally unlikely to fall at this location in September or this station does not reliably report precipitation types.
The relative humidity typically ranges from 70% (mildly humid) to 99% (very humid) over the course of a typical September, rarely dropping below 59% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around September 30, at which time the relative humidity drops below 75% (humid) three days out of four; it is most humid around September 1, rising above 100% (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 September, the dew point typically varies from 75°F (very muggy) to 80°F (very oppressive) and is rarely below 73°F (very muggy) or above 81°F (very oppressive).
Over the course of September typical wind speeds vary from 0 mph to 9 mph (calm to gentle breeze), rarely exceeding 12 mph (gentle breeze).
The highest average wind speed of 4 mph (light breeze) occurs around September 6, at which time the average daily maximum wind speed is 9 mph (gentle breeze).
The lowest average wind speed of 4 mph (light breeze) occurs around September 30, at which time the average daily maximum wind speed is 8 mph (gentle breeze).