Average Weather in October in Santiago Brazil
Daily high temperatures increase by 6°F, from 72°F to 79°F, rarely falling below 63°F or exceeding 88°F.
Daily low temperatures increase by 5°F, from 54°F to 59°F, rarely falling below 44°F or exceeding 67°F.
For reference, on January 9, the hottest day of the year, temperatures in Santiago typically range from 67°F to 87°F, while on July 21, the coldest day of the year, they range from 47°F to 64°F.
Average High and Low Temperature in October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October
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 October in Santiago experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 39% throughout the month.
The clearest day of the month is October 31, with clear, mostly clear, or partly cloudy conditions 63% of the time.
For reference, on June 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 48%, while on March 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.
Cloud Cover Categories in October
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 Santiago, the chance of a wet day over the course of October is essentially constant, remaining around 39% throughout.
For reference, the year's highest daily chance of a wet day is 45% on February 8, and its lowest chance is 26% on August 25.
Probability of Precipitation in October
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 October in Santiago is gradually increasing, starting the month at 6.8 inches, when it rarely exceeds 10.6 inches or falls below 2.9 inches, and ending the month at 7.2 inches, when it rarely exceeds 12.9 inches or falls below 2.5 inches.
The highest average 31-day accumulation is 7.4 inches on October 21.
Average Monthly Rainfall in October
Over the course of October in Santiago, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 51 minutes, implying an average daily increase of 1 minute, 41 seconds, and weekly increase of 11 minutes, 50 seconds.
The shortest day of the month is October 1, with 12 hours, 22 minutes of daylight and the longest day is October 31, with 13 hours, 13 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Santiago is 5:58 AM on October 19 and the latest sunrise is 59 minutes later at 6:57 AM on October 20.
The earliest sunset is 6:40 PM on October 1 and the latest sunset is 1 hour, 19 minutes later at 7:59 PM on October 31.
Daylight saving time (DST) starts at 1:00 AM on October 20, 2019, shifting sunrise and sunset to be an hour later.
For reference, on December 22, the longest day of the year, the Sun rises at 6:37 AM and sets 14 hours, 1 minute later, at 8:38 PM, while on June 21, the shortest day of the year, it rises at 7:32 AM and sets 10 hours, 17 minutes later, at 5:49 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
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 Santiago is rapidly increasing during October, rising from 16% to 26% over the course of the month.
For reference, on February 8, the muggiest day of the year, there are muggy conditions 68% of the time, while on August 5, the least muggy day of the year, there are muggy conditions 4% of the time.
Humidity Comfort Levels in October
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 Santiago is essentially constant during October, remaining within 0.1 miles per hour of 6.1 miles per hour throughout.
For reference, on September 14, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on March 5, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.
Average Wind Speed in October
Wind Direction in October
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).
The growing season in Santiago typically lasts for 11 months (333 days), from around July 25 to around June 23, rarely starting after August 26, or ending before May 24.
The month of October in Santiago is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in October
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 Santiago are rapidly increasing during October, increasing by 468°F, from 824°F to 1,292°F, over the course of the month.
Growing Degree Days in October
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 Santiago is increasing during October, rising by 1.1 kWh, from 5.5 kWh to 6.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of Santiago are -29.192 deg latitude, -54.867 deg longitude, and 1,270 ft elevation.
The topography within 2 miles of Santiago contains only modest variations in elevation, with a maximum elevation change of 413 feet and an average elevation above sea level of 1,292 feet. Within 10 miles contains only modest variations in elevation (948 feet). Within 50 miles also contains very significant variations in elevation (1,581 feet).
The area within 2 miles of Santiago is covered by grassland (36%), trees (34%), and shrubs (28%), within 10 miles by trees (33%) and cropland (24%), and within 50 miles by cropland (29%) and trees (28%).
This report illustrates the typical weather in Santiago 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, Aeroporto de Santa Maria, in our network suitable to be used as a proxy for the historical temperature and dew point records of Santiago.
At a distance of 128 kilometers from Santiago, 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 Santiago 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.
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.