September Weather in Nouakchott Mauritania

Daily high temperatures increase by 4°F, from 91°F to 95°F, rarely falling below 86°F or exceeding 105°F.

Daily low temperatures are around 78°F, rarely falling below 74°F or exceeding 82°F. The highest daily average low temperature is 79°F on September 5.

For reference, on October 13, the hottest day of the year, temperatures in Nouakchott typically range from 76°F to 96°F, while on January 12, the coldest day of the year, they range from 60°F to 83°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.

Villa Juárez, Mexico (5,733 miles away) is the far-away foreign place with temperatures most similar to Nouakchott (view comparison).

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The month of September in Nouakchott experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 53% throughout the month. The highest chance of overcast or mostly cloudy conditions is 56% on September 15.

The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 50% of the time.

For reference, on September 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on June 11, 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 Nouakchott, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 19% and ending it at 7%.

For reference, the year's highest daily chance of a wet day is 20% on August 29, and its lowest chance is 0% on May 12.

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 Nouakchott is decreasing, starting the month at 1.3 inches, when it rarely exceeds 3.2 inches or falls below 0.2 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.8 inches.

Over the course of September in Nouakchott, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 29 minutes, implying an average daily decrease of 1 minute, 0 seconds, and weekly decrease of 7 minutes, 3 seconds.

The shortest day of the month is September 30, with 11 hours, 59 minutes of daylight and the longest day is September 1, with 12 hours, 28 minutes of daylight.

The earliest sunrise of the month in Nouakchott is 6:49 AM on September 1 and the latest sunrise is 5 minutes later at 6:54 AM on September 30.

The latest sunset is 7:17 PM on September 1 and the earliest sunset is 25 minutes earlier at 6:52 PM on September 30.

Daylight saving time is not observed in Nouakchott during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 6:29 AM and sets 13 hours, 13 minutes later, at 7:42 PM, while on December 21, the shortest day of the year, it rises at 7:30 AM and sets 11 hours, 3 minutes later, at 6:33 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 Nouakchott is very rapidly decreasing during September, falling from 95% to 74% over the course of the month.

For reference, on August 4, the muggiest day of the year, there are muggy conditions 97% of the time, while on January 24, the least muggy day of the year, there are muggy conditions 0% 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 Nouakchott is essentially constant during September, remaining within 0.2 miles per hour of 9.4 miles per hour throughout.

For reference, on May 13, the windiest day of the year, the daily average wind speed is 13.2 miles per hour, while on September 15, the calmest day of the year, the daily average wind speed is 9.3 miles per hour.

The lowest daily average wind speed during September is 9.3 miles per hour on September 15.

The wind direction in Nouakchott during September is predominantly out of the west from September 1 to September 18 and the north from September 18 to September 30.

Nouakchott 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 Nouakchott is essentially constant during September, remaining within 1°F of 80°F throughout.

The highest average surface water temperature during September is 81°F on September 8.

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 Nouakchott 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 Nouakchott are very rapidly increasing during September, increasing by 954°F, from 6,278°F to 7,232°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 Nouakchott is essentially constant during September, remaining within 0.1 kWh of 5.8 kWh throughout.

For the purposes of this report, the geographical coordinates of Nouakchott are 18.086 deg latitude, -15.979 deg longitude, and 33 ft elevation.

The topography within 2 miles of Nouakchott is essentially flat, with a maximum elevation change of 79 feet and an average elevation above sea level of 16 feet. Within 10 miles is essentially flat (135 feet). Within 50 miles also contains only modest variations in elevation (351 feet).

The area within 2 miles of Nouakchott is covered by bare soil (88%) and grassland (12%), within 10 miles by bare soil (68%) and water (29%), and within 50 miles by bare soil (44%) and water (43%).