Average Weather in September in San Juan y Martínez Cuba
Daily high temperatures are around 88°F, rarely falling below 85°F or exceeding 91°F.
Daily low temperatures are around 80°F, rarely falling below 77°F or exceeding 83°F.
For reference, on August 9, the hottest day of the year, temperatures in San Juan y Martínez typically range from 81°F to 89°F, while on January 19, the coldest day of the year, they range from 71°F to 79°F.
Average High and Low Temperature in September
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
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
Salvador, Brazil (3,923 miles away); Mombasa, Kenya (8,469 miles); and Cabiraoan, Philippines (9,139 miles) are the far-away foreign places with temperatures most similar to San Juan y Martínez (view comparison).
The month of September in San Juan y Martínez experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 72% throughout the month. The highest chance of overcast or mostly cloudy conditions is 74% on September 12.
The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 31% of the time.
For reference, on June 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on February 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 80%.
Cloud Cover Categories in September
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 San Juan y Martínez, the chance of a wet day over the course of September is essentially constant, remaining around 33% throughout.
For reference, the year's highest daily chance of a wet day is 34% on September 14, and its lowest chance is 8% on December 21.
Probability of Precipitation in September
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 San Juan y Martínez is essentially constant, remaining about 4.6 inches throughout, and rarely exceeding 8.8 inches or falling below 0.8 inches.
The highest average 31-day accumulation is 4.7 inches on September 15.
Average Monthly Rainfall in September
Over the course of September in San Juan y Martínez, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 37 minutes, implying an average daily decrease of 1 minute, 16 seconds, and weekly decrease of 8 minutes, 51 seconds.
The shortest day of the month is September 30, with 11 hours, 57 minutes of daylight and the longest day is September 1, with 12 hours, 34 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in San Juan y Martínez is 7:18 AM on September 1 and the latest sunrise is 8 minutes later at 7:26 AM on September 30.
The latest sunset is 7:52 PM on September 1 and the earliest sunset is 28 minutes earlier at 7:23 PM on September 30.
Daylight saving time is observed in San Juan y Martínez during 2018, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:52 AM and sets 13 hours, 30 minutes later, at 8:22 PM, while on December 21, the shortest day of the year, it rises at 7:10 AM and sets 10 hours, 46 minutes later, at 5:56 PM.
Sunrise & Sunset with Twilight in September
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 San Juan y Martínez is essentially constant during September, remaining around 100% throughout.
For reference, on June 8, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 30, the least muggy day of the year, there are muggy conditions 66% of the time.
Humidity Comfort Levels in September
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 San Juan y Martínez is gradually increasing during September, increasing from 7.9 miles per hour to 8.5 miles per hour over the course of the month.
For reference, on November 19, the windiest day of the year, the daily average wind speed is 10.8 miles per hour, while on July 28, the calmest day of the year, the daily average wind speed is 7.5 miles per hour.
Average Wind Speed in September
Wind Direction in September
San Juan y Martínez 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 San Juan y Martínez is essentially constant during September, remaining around 85°F throughout.
Average Water Temperature in September
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 San Juan y Martínez 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
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 San Juan y Martínez are very rapidly increasing during September, increasing by 972°F, from 7,150°F to 8,122°F, over the course of the month.
Growing Degree Days in September
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 San Juan y Martínez is essentially constant during September, remaining within 0.1 kWh of 4.5 kWh throughout.
The lowest average daily incident shortwave solar energy during September is 4.4 kWh on September 21.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of San Juan y Martínez are 22.280 deg latitude, -83.840 deg longitude, and 108 ft elevation.
The topography within 2 miles of San Juan y Martínez contains only modest variations in elevation, with a maximum elevation change of 295 feet and an average elevation above sea level of 108 feet. Within 10 miles contains only modest variations in elevation (1,493 feet). Within 50 miles contains very significant variations in elevation (2,339 feet).
The area within 2 miles of San Juan y Martínez is covered by cropland (65%) and trees (27%), within 10 miles by cropland (38%) and trees (38%), and within 50 miles by water (57%) and trees (20%).
This report illustrates the typical weather in San Juan y Martínez year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There is only a single weather station, San Antonio de Los Banos, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Juan y Martínez.
At a distance of 152 kilometers from San Juan y Martínez, 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 San Juan y Martínez to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 4%, making the weight assigned to the weather station 96%.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.