September Weather in Aş Şalīf Yemen

Daily high temperatures are around 92°F, rarely falling below 89°F or exceeding 94°F.

Daily low temperatures decrease by 3°F, from 87°F to 84°F, rarely falling below 82°F or exceeding 89°F.

For reference, on July 31, the hottest day of the year, temperatures in Aş Şalīf typically range from 88°F to 93°F, while on January 4, the coldest day of the year, they range from 73°F to 81°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Qui Nhon, Vietnam (4,439 miles away) and Basco, Philippines (5,183 miles) are the far-away foreign places with temperatures most similar to Aş Şalīf (view comparison).

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The month of September in Aş Şalīf experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 31% throughout the month.

The clearest day of the month is September 10, with clear, mostly clear, or partly cloudy conditions 71% of the time.

For reference, on May 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 55%, while on November 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 84%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Aş Şalīf, the chance of a wet day over the course of September is decreasing, starting the month at 9% and ending it at 3%.

For reference, the year's highest daily chance of a wet day is 19% on July 19, and its lowest chance is 1% on February 13.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during September in Aş Şalīf is gradually decreasing, starting the month at 0.4 inches, when it rarely exceeds 0.9 inches, and ending the month at 0.2 inches, when it rarely exceeds 0.6 inches.

Over the course of September in Aş Şalīf, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 24 minutes, implying an average daily decrease of 51 seconds, and weekly decrease of 5 minutes, 54 seconds.

The shortest day of the month is September 30, with 12 hours, 0 minutes of daylight and the longest day is September 1, with 12 hours, 25 minutes of daylight.

The earliest sunrise of the month in Aş Şalīf is 5:56 AM on September 1 and the latest sunrise is 2 minutes, 13 seconds later at 5:59 AM on September 30.

The latest sunset is 6:21 PM on September 1 and the earliest sunset is 22 minutes earlier at 5:59 PM on September 30.

Daylight saving time is not observed in Aş Şalīf during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:39 AM and sets 13 hours, 2 minutes later, at 6:42 PM, while on December 21, the shortest day of the year, it rises at 6:30 AM and sets 11 hours, 13 minutes later, at 5:44 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for September 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Aş Şalīf is essentially constant during September, remaining around 100% throughout.

For reference, on May 21, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 7, the least muggy day of the year, there are muggy conditions 98% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Aş Şalīf is essentially constant during September, remaining within 0.3 miles per hour of 7.5 miles per hour throughout.

For reference, on November 29, the windiest day of the year, the daily average wind speed is 9.8 miles per hour, while on May 22, the calmest day of the year, the daily average wind speed is 7.2 miles per hour.

The lowest daily average wind speed during September is 7.2 miles per hour on September 24.

The wind direction in Aş Şalīf during September is predominantly out of the west from September 1 to September 28 and the south from September 28 to September 30.

Aş Şalīf is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Aş Şalīf is essentially constant during September, remaining around 89°F throughout.

The highest average surface water temperature during September is 90°F on September 25.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Aş Şalīf are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Aş Şalīf are very rapidly increasing during September, increasing by 1,037°F, from 7,999°F to 9,036°F, over the course of the month.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Aş Şalīf is essentially constant during September, remaining within 0.1 kWh of 6.2 kWh throughout.

The highest average daily incident shortwave solar energy during September is 6.3 kWh on September 1.

For the purposes of this report, the geographical coordinates of Aş Şalīf are 15.308 deg latitude, 42.671 deg longitude, and 13 ft elevation.

The topography within 2 miles of Aş Şalīf contains only modest variations in elevation, with a maximum elevation change of 144 feet and an average elevation above sea level of 9 feet. Within 10 miles also contains only modest variations in elevation (328 feet). Within 50 miles contains only modest variations in elevation (8,251 feet).

The area within 2 miles of Aş Şalīf is covered by water (71%) and bare soil (29%), within 10 miles by water (69%) and bare soil (30%), and within 50 miles by water (62%) and bare soil (18%).