September Weather in Riachão do Jacuípe BrazilDaily high temperatures increase by 4°F, from 90°F to 94°F, rarely falling below 86°F or exceeding 99°F. Daily low temperatures increase by 3°F, from 65°F to 68°F, rarely falling below 61°F or exceeding 71°F. For reference, on January 31, the hottest day of the year, temperatures in Riachão do Jacuípe typically range from 71°F to 96°F, while on August 1, the coldest day of the year, they range from 64°F to 87°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. Mérida, Mexico (4,098 miles away) is the far-away foreign place with temperatures most similar to Riachão do Jacuípe (view comparison). CloudsThe month of September in Riachão do Jacuípe experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 27% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 25% on September 15. The clearest day of the month is September 15, with clear, mostly clear, or partly cloudy conditions 75% of the time. For reference, on December 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, while on July 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Riachão do Jacuípe, the chance of a wet day over the course of September is essentially constant, remaining around 10% throughout. For reference, the year's highest daily chance of a wet day is 25% on March 25, and its lowest chance is 9% on September 27. RainfallTo 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 Riachão do Jacuípe is essentially constant, remaining about 0.5 inches throughout, and rarely exceeding 1.6 inches. The lowest average 31-day accumulation is 0.5 inches on September 15. SunOver the course of September in Riachão do Jacuípe, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 19 minutes, implying an average daily increase of 38 seconds, and weekly increase of 4 minutes, 29 seconds. The shortest day of the month is September 1, with 11 hours, 53 minutes of daylight and the longest day is September 30, with 12 hours, 12 minutes of daylight. The latest sunrise of the month in Riachão do Jacuípe is 5:40 AM on September 1 and the earliest sunrise is 19 minutes earlier at 5:21 AM on September 30. The latest sunset is 5:34 PM on September 1 and the earliest sunset is 44 seconds earlier at 5:33 PM on September 29. Daylight saving time is not observed in Riachão do Jacuípe during 2024. For reference, on December 21, the longest day of the year, the Sun rises at 5:11 AM and sets 12 hours, 49 minutes later, at 6:00 PM, while on June 20, the shortest day of the year, it rises at 5:56 AM and sets 11 hours, 26 minutes later, at 5:22 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. MoonThe 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.
HumidityWe 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 Riachão do Jacuípe is rapidly increasing during September, rising from 39% to 50% over the course of the month. For reference, on April 18, the muggiest day of the year, there are muggy conditions 88% of the time, while on August 21, the least muggy day of the year, there are muggy conditions 38% of the time. WindThis 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 Riachão do Jacuípe is gradually increasing during September, increasing from 10.1 miles per hour to 10.6 miles per hour over the course of the month. For reference, on October 18, the windiest day of the year, the daily average wind speed is 10.7 miles per hour, while on March 24, the calmest day of the year, the daily average wind speed is 8.5 miles per hour. The hourly average wind direction in Riachão do Jacuípe throughout September is predominantly from the east, with a peak proportion of 90% on September 30. Growing SeasonDefinitions 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 Riachão do Jacuípe 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 Riachão do Jacuípe are rapidly increasing during September, increasing by 769°F, from 1,475°F to 2,245°F, over the course of the month. Solar EnergyThis 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 Riachão do Jacuípe is gradually increasing during September, rising by 0.7 kWh, from 6.5 kWh to 7.2 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Riachão do Jacuípe are -11.807 deg latitude, -39.386 deg longitude, and 712 ft elevation. The topography within 2 miles of Riachão do Jacuípe contains only modest variations in elevation, with a maximum elevation change of 118 feet and an average elevation above sea level of 726 feet. Within 10 miles contains only modest variations in elevation (528 feet). Within 50 miles contains significant variations in elevation (2,051 feet). The area within 2 miles of Riachão do Jacuípe is covered by cropland (30%), trees (25%), grassland (23%), and shrubs (22%), within 10 miles by cropland (45%) and trees (20%), and within 50 miles by cropland (28%) and shrubs (24%). Data SourcesThis report illustrates the typical weather in Riachão do Jacuípe, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere is only a single weather station, Salvador International Airport, Deputado Luís Eduardo Magalhães, in our network suitable to be used as a proxy for the historical temperature and dew point records of Riachão do Jacuípe. At a distance of 168 kilometers from Riachão do Jacuípe, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis , and both are corrected for elevation differences according to the International Standard Atmosphere . The weight assigned to the MERRA-2 value depends on the distance from Riachão do Jacuípe to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 27%, making the weight assigned to the weather station 73%. Other DataAll 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. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . 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. 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 © OpenStreetMap contributors. DisclaimerThe 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. Please review our full terms contained on our Terms of Service page. |