Average Weather in October in Santiago Costa Rica
In Santiago, the month of October is characterized by essentially constant daily high temperatures, with daily highs around 79°F throughout the month, rarely exceeding 83°F or dropping below 74°F. The lowest daily average high temperature is 78°F on October 21.
Daily low temperatures are around 66°F, rarely falling below 64°F or exceeding 68°F. The lowest daily average low temperature is 66°F on October 2.
For reference, on March 24, the hottest day of the year, temperatures in Santiago typically range from 68°F to 84°F, while on October 2, the coldest day of the year, they range from 66°F to 79°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
The month of October in Santiago experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 93% to 85%.
The clearest day of the month is October 31, with clear, mostly clear, or partly cloudy conditions 15% of the time.
For reference, on June 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 95%, while on January 1, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 65%.
Cloud Cover in October
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 rapidly decreasing, starting the month at 50% and ending it at 43%.
For reference, the year's highest daily chance of a wet day is 51% on October 7, and its lowest chance is 5% on February 2.
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 rapidly decreasing, starting the month at 6.7 inches, when it rarely exceeds 12.9 inches or falls below 2.6 inches, and ending the month at 5.5 inches, when it rarely exceeds 10.6 inches or falls below 1.9 inches.
The highest average 31-day accumulation is 6.8 inches on October 9.
Average Monthly Rainfall in October
Over the course of October in Santiago, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 15 minutes, implying an average daily decrease of 30 seconds, and weekly decrease of 3 minutes, 32 seconds.
The shortest day of the month is October 31, with 11 hours, 47 minutes of daylight and the longest day is October 1, with 12 hours, 2 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Santiago is 5:25 AM on October 10 and the latest sunrise is 1 minute, 56 seconds later at 5:27 AM on October 31.
The latest sunset is 5:27 PM on October 1 and the earliest sunset is 13 minutes earlier at 5:14 PM on October 31.
Daylight saving time is not observed in Santiago during 2017.
For reference, on June 21, the longest day of the year, the Sun rises at 5:18 AM and sets 12 hours, 42 minutes later, at 6:00 PM, while on December 21, the shortest day of the year, it rises at 5:49 AM and sets 11 hours, 33 minutes later, at 5:22 PM.
Sunrise & Sunset with Twilight 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 decreasing during October, falling from 82% to 71% over the course of the month.
For reference, on June 4, the muggiest day of the year, there are muggy conditions 83% of the time, while on January 24, the least muggy day of the year, there are muggy conditions 6% of the time.
Humidity Comfort Levels in October
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 1.6 miles per hour throughout.
For reference, on October 8, the windiest day of the year, the daily average wind speed is 1.8 miles per hour, while on December 9, the calmest day of the year, the daily average wind speed is 1.1 miles per hour.
The highest daily average wind speed during October is 1.8 miles per hour on October 8.
Average Wind Speed in October
Wind Direction in October
Santiago 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 Santiago is essentially constant during October, remaining around 82°F throughout.
Average Water Temperature 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 essentially constant during October, remaining within 0.1 kWh of 3.8 kWh throughout.
The lowest average daily incident shortwave solar energy during October is 3.7 kWh on October 11.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of Santiago are 9.846 deg latitude, -84.314 deg longitude, and 3,028 ft elevation.
The topography within 2 miles of Santiago contains very significant variations in elevation, with a maximum elevation change of 1,850 feet and an average elevation above sea level of 3,257 feet. Within 10 miles contains very significant variations in elevation (6,404 feet). Within 50 miles also contains extreme variations in elevation (11,467 feet).
The area within 2 miles of Santiago is covered by grassland (44%), trees (26%), cropland (17%), and shrubs (13%), within 10 miles by trees (38%) and grassland (38%), and within 50 miles by trees (40%) and water (31%).
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, Juan Santamaría International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Santiago.
At a distance of 20 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.