This report describes the typical weather at the Riga International Airport (Riga, Latvia) weather station over the course of an average August. It is based on the historical records from 1995 to 2012. Earlier records are either unavailable or unreliable.
Riga has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by croplands (43%), oceans and seas (26%), forests (15%), grasslands (10%), and built-up areas (3%).
The month of August is characterized by falling daily high temperatures, with daily highs decreasing from 75Â°F to 69Â°F over the course of the month, exceeding 83Â°F or dropping below 62Â°F only one day in ten.
Over the course of August, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 2:15 hours, implying an average day-over-day decrease of 4.4 minutes.
The shortest day of the month is August 31 with 13:57 hours of daylight; the longest day is August 1 with 16:12 hours of daylight.
The earliest sunrise is at 5:24am on August 1; the latest sunset is at 9:36pm on August 1; the latest sunrise is at 6:25am on August 31; the earliest sunset is at 8:22pm on August 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in August, so the entire month is in daylight time.
The median cloud cover is 87% (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 6% of the time, partly cloudy 11% of the time, and mostly cloudy or overcast 43% of the time.
The average probability that some form of precipitation will be observed in a given day is 50%, with little variation over the course of the month.
Throughout August, the most common forms of precipitation are light rain, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 47% of those days with precipitation. It is most likely around August 31, when it is observed during 27% of all days.
Thunderstorms are the most severe precipitation observed during 37% of those days with precipitation. They are most likely around August 4, when it is observed during 24% of all days.
Moderate rain is the most severe precipitation observed during 15% 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 54% (mildly humid) to 97% (very humid) over the course of a typical August, rarely dropping below 39% (comfortable) and reaching as high as 100% (very humid).
The air is driest around August 7, at which time the relative humidity drops below 60% (mildly humid) three days out of four; it is most humid around August 28, rising above 96% (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 48Â°F (dry) to 62Â°F (mildy humid) and is rarely below 42Â°F (dry) or above 67Â°F (muggy).
The time of the month between August 1 and August 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of August typical wind speeds vary from 0 mph to 12 mph (calm to moderate breeze), rarely exceeding 17 mph (moderate breeze).
The highest average wind speed of 7 mph (light breeze) occurs around August 2, at which time the average daily maximum wind speed is 12 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around August 28, at which time the average daily maximum wind speed is 11 mph (gentle breeze).