September Weather in Siguiri Guinea
Daily high temperatures increase by 2°F, from 83°F to 85°F, rarely falling below 79°F or exceeding 90°F.
Daily low temperatures are around 71°F, rarely falling below 69°F or exceeding 73°F.
For reference, on April 1, the hottest day of the year, temperatures in Siguiri typically range from 76°F to 103°F, while on December 26, the coldest day of the year, they range from 61°F to 92°F.
Average High and Low Temperature in September in Siguiri
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.
Average Hourly Temperature in September in Siguiri
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The month of September in Siguiri experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 73% to 65%.
The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 35% of the time.
For reference, on August 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on January 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.
Cloud Cover Categories in September in Siguiri
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Siguiri, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 88% and ending it at 61%.
For reference, the year's highest daily chance of a wet day is 90% on August 14, and its lowest chance is -0% on December 17.
Probability of Precipitation in September in Siguiri
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 Siguiri is very rapidly decreasing, starting the month at 10.6 inches, when it rarely exceeds 16.9 inches or falls below 4.5 inches, and ending the month at 5.4 inches, when it rarely exceeds 9.2 inches or falls below 1.9 inches.
Average Monthly Rainfall in September in Siguiri
Over the course of September in Siguiri, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 18 minutes, implying an average daily decrease of 37 seconds, and weekly decrease of 4 minutes, 22 seconds.
The shortest day of the month is September 30, with 12 hours, 2 minutes of daylight and the longest day is September 1, with 12 hours, 20 minutes of daylight.
Hours of Daylight and Twilight in September in Siguiri
The latest sunrise of the month in Siguiri is 6:26 AM on September 1 and the earliest sunrise is 59 seconds earlier at 6:25 AM on September 30.
The latest sunset is 6:46 PM on September 1 and the earliest sunset is 19 minutes earlier at 6:27 PM on September 30.
Daylight saving time is not observed in Siguiri during 2021.
For reference, on June 21, the longest day of the year, the Sun rises at 6:14 AM and sets 12 hours, 48 minutes later, at 7:02 PM, while on December 21, the shortest day of the year, it rises at 6:51 AM and sets 11 hours, 27 minutes later, at 6:18 PM.
Sunrise & Sunset with Twilight in September in Siguiri
The figure below presents a compact representation of key lunar data for September 2021. 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.
Moon Rise, Set & Phases in September in Siguiri
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 Siguiri is essentially constant during September, remaining around 100% throughout.
For reference, on August 11, the muggiest day of the year, there are muggy conditions 100% of the time, while on December 31, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September in Siguiri
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Siguiri is gradually decreasing during September, decreasing from 5.4 miles per hour to 4.5 miles per hour over the course of the month.
For reference, on January 26, the windiest day of the year, the daily average wind speed is 8.3 miles per hour, while on October 16, the calmest day of the year, the daily average wind speed is 4.4 miles per hour.
Average Wind Speed in September in Siguiri
The wind direction in Siguiri during September is predominantly out of the west from September 1 to September 18 and the east from September 18 to September 30.
Wind Direction in September in Siguiri
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 Siguiri 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.
Time Spent in Various Temperature Bands and the Growing Season in September in Siguiri
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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 Siguiri are rapidly increasing during September, increasing by 788°F, from 7,218°F to 8,006°F, over the course of the month.
Growing Degree Days in September in Siguiri
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 Siguiri is essentially constant during September, remaining within 0.1 kWh of 5.0 kWh throughout.
Average Daily Incident Shortwave Solar Energy in September in Siguiri
For the purposes of this report, the geographical coordinates of Siguiri are 11.423 deg latitude, -9.169 deg longitude, and 1,207 ft elevation.
The topography within 2 miles of Siguiri contains only modest variations in elevation, with a maximum elevation change of 230 feet and an average elevation above sea level of 1,182 feet. Within 10 miles contains only modest variations in elevation (515 feet). Within 50 miles contains significant variations in elevation (1,890 feet).
The area within 2 miles of Siguiri is covered by artificial surfaces (46%), cropland (27%), and grassland (10%), within 10 miles by cropland (38%) and trees (31%), and within 50 miles by trees (55%) and cropland (21%).
This report illustrates the typical weather in Siguiri, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Siguiri is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Siguiri, according to the International Standard Atmosphere .
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.