Climate and Average Weather Year Round in Santiago Brazil

In Santiago, the summers are long, hot, and muggy; the winters are cool; and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 47°F to 87°F and is rarely below 34°F or above 96°F.

Based on the tourism score, the best times of year to visit Santiago for warm-weather activities are from mid February to late April and from early October to mid December.

The hot season lasts for 4.0 months, from November 18 to March 17, with an average daily high temperature above 82°F. The hottest month of the year in Santiago is January, with an average high of 87°F and low of 67°F.

The cool season lasts for 3.0 months, from May 17 to August 17, with an average daily high temperature below 68°F. The coldest month of the year in Santiago is July, with an average low of 47°F and high of 64°F.

In Santiago, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Santiago begins around September 24 and lasts for 7.6 months, ending around May 13.

The clearest month of the year in Santiago is March, during which on average the sky is clear, mostly clear, or partly cloudy 67% of the time.

The cloudier part of the year begins around May 13 and lasts for 4.4 months, ending around September 24.

The cloudiest month of the year in Santiago is June, during which on average the sky is overcast or mostly cloudy 47% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Santiago varies throughout the year.

The wetter season lasts 6.9 months, from September 21 to April 18, with a greater than 35% chance of a given day being a wet day. The month with the most wet days in Santiago is February, with an average of 12.1 days with at least 0.04 inches of precipitation.

The drier season lasts 5.1 months, from April 18 to September 21. The month with the fewest wet days in Santiago is August, with an average of 8.7 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Santiago is February, with an average of 12.1 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 45% on February 8.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Santiago experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Santiago. The month with the most rain in Santiago is October, with an average rainfall of 7.4 inches.

The month with the least rain in Santiago is August, with an average rainfall of 3.8 inches.

The length of the day in Santiago varies significantly over the course of the year. In 2024, the shortest day is June 20, with 10 hours, 17 minutes of daylight; the longest day is December 21, with 14 hours, 1 minute of daylight.

The earliest sunrise is at 5:32 AM on December 2, and the latest sunrise is 2 hours, 2 minutes later at 7:34 AM on July 1. The earliest sunset is at 5:48 PM on June 9, and the latest sunset is 1 hour, 55 minutes later at 7:43 PM on January 10.

Daylight saving time (DST) is not observed in Santiago during 2024.

The figure below presents a compact representation of key lunar data for 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.

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.

Santiago experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 6.8 months, from October 11 to May 5, during which time the comfort level is muggy, oppressive, or miserable at least 20% of the time. The month with the most muggy days in Santiago is February, with 19.4 days that are muggy or worse.

The month with the fewest muggy days in Santiago is July, with 1.4 days that are muggy or worse.

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 experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from June 18 to December 13, with average wind speeds of more than 5.5 miles per hour. The windiest month of the year in Santiago is September, with an average hourly wind speed of 6.1 miles per hour.

The calmer time of year lasts for 6.1 months, from December 13 to June 18. The calmest month of the year in Santiago is March, with an average hourly wind speed of 5.0 miles per hour.

The predominant average hourly wind direction in Santiago varies throughout the year.

The wind is most often from the north for 2.1 months, from May 28 to August 1, with a peak percentage of 38% on June 20. The wind is most often from the east for 9.9 months, from August 1 to May 28, with a peak percentage of 49% on January 1.

To characterize how pleasant the weather is in Santiago throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Santiago for general outdoor tourist activities are from mid February to late April and from early October to mid December, with a peak score in the last week of March.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Santiago for hot-weather activities is from late November to mid March, with a peak score in the second week of January.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 (332 days), from around July 24 to around June 22, rarely starting after August 25, or ending before May 23.

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.

Based on growing degree days alone, the first spring blooms in Santiago should appear around July 14, only rarely appearing before July 10 or after July 22.

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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from October 30 to February 11, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest month of the year in Santiago is December, with an average of 7.4 kWh.

The darker period of the year lasts for 3.1 months, from May 6 to August 11, with an average daily incident shortwave energy per square meter below 3.8 kWh. The darkest month of the year in Santiago is June, with an average of 3.0 kWh.

For the purposes of this report, the geographical coordinates of Santiago are -29.192 deg latitude, -54.867 deg longitude, and 1,398 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%).