September Weather in Cochabamba BoliviaDaily high temperatures are around 78°F, rarely falling below 71°F or exceeding 83°F. Daily low temperatures increase by 5°F, from 46°F to 51°F, rarely falling below 41°F or exceeding 55°F. For reference, on October 29, the hottest day of the year, temperatures in Cochabamba typically range from 54°F to 79°F, while on June 28, the coldest day of the year, they range from 39°F to 74°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. San José Chalmita, Mexico (3,382 miles away) is the far-away foreign place with temperatures most similar to Cochabamba (view comparison). CloudsThe month of September in Cochabamba experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 29% to 46%. The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 71% of the time. For reference, on January 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 82%, while on July 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Cochabamba, the chance of a wet day over the course of September is gradually increasing, starting the month at 4% and ending it at 8%. For reference, the year's highest daily chance of a wet day is 45% on January 10, and its lowest chance is 1% on July 20. 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 Cochabamba is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 0.8 inches or falling below -0.0 inches. SunOver the course of September in Cochabamba, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 28 minutes, implying an average daily increase of 58 seconds, and weekly increase of 6 minutes, 44 seconds. The shortest day of the month is September 1, with 11 hours, 47 minutes of daylight and the longest day is September 30, with 12 hours, 15 minutes of daylight. The latest sunrise of the month in Cochabamba is 6:31 AM on September 1 and the earliest sunrise is 24 minutes earlier at 6:07 AM on September 30. The earliest sunset is 6:17 PM on September 1 and the latest sunset is 4 minutes later at 6:21 PM on September 30. Daylight saving time is not observed in Cochabamba during 2024. For reference, on December 21, the longest day of the year, the Sun rises at 5:47 AM and sets 13 hours, 10 minutes later, at 6:58 PM, while on June 20, the shortest day of the year, it rises at 6:53 AM and sets 11 hours, 5 minutes later, at 5:59 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 Cochabamba is essentially constant during September, remaining around 0% throughout. For reference, on January 1, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 16, the least muggy day of the year, there are muggy conditions 0% 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 Cochabamba is essentially constant during September, remaining within 0.2 miles per hour of 7.8 miles per hour throughout. For reference, on September 24, the windiest day of the year, the daily average wind speed is 8.0 miles per hour, while on May 10, the calmest day of the year, the daily average wind speed is 6.2 miles per hour. The highest daily average wind speed during September is 8.0 miles per hour on September 26. The hourly average wind direction in Cochabamba throughout September is predominantly from the north, with a peak proportion of 73% on September 25. 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). While it does not do so every year, freezing temperatures are seen in Cochabamba over some winters. The day least likely to be in the growing season is July 3, with a 54% chance. 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 Cochabamba are increasing during September, increasing by 386°F, from 610°F to 996°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 Cochabamba is essentially constant during September, remaining within 0.1 kWh of 6.4 kWh throughout. TopographyFor the purposes of this report, the geographical coordinates of Cochabamba are -17.389 deg latitude, -66.157 deg longitude, and 8,455 ft elevation. The topography within 2 miles of Cochabamba contains very significant variations in elevation, with a maximum elevation change of 951 feet and an average elevation above sea level of 8,509 feet. Within 10 miles contains very significant variations in elevation (6,686 feet). Within 50 miles also contains extreme variations in elevation (15,456 feet). The area within 2 miles of Cochabamba is covered by artificial surfaces (100%), within 10 miles by shrubs (33%) and grassland (27%), and within 50 miles by grassland (32%) and trees (26%). Data SourcesThis report illustrates the typical weather in Cochabamba, 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, Jorge Wilsterman, in our network suitable to be used as a proxy for the historical temperature and dew point records of Cochabamba. At a distance of 4 kilometers from Cochabamba, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records. The station records are corrected for the elevation difference between the station and Cochabamba according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis. 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. |