Average Weather at Foz do Iguaçu / Cataratas International Airport Brazil
At Foz do Iguaçu / Cataratas International Airport, the summers are long, hot, and muggy; the winters are short and cool; and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 53°F to 90°F and is rarely below 39°F or above 96°F.
Based on the tourism score, the best times of year to visit Foz do Iguaçu / Cataratas International Airport for warm-weather activities are from late March to early June and from late July to early November.
The hot season lasts for 4.4 months, from November 12 to March 25, with an average daily high temperature above 86°F. The hottest day of the year is January 14, with an average high of 90°F and low of 70°F.
The cool season lasts for 2.8 months, from May 14 to August 7, with an average daily high temperature below 75°F. The coldest day of the year is July 22, with an average low of 53°F and high of 73°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
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
Giyani, South Africa (5,264 miles away); Ta‘izz, Yemen (7,150 miles); and Rockhampton, Australia (8,672 miles) are the far-away foreign places with temperatures most similar to Foz do Iguaçu / Cataratas International Airport (view comparison).
At Foz do Iguaçu / Cataratas International Airport, 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 at Foz do Iguaçu / Cataratas International Airport begins around July 3 and lasts for 3.1 months, ending around October 6. On September 1, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.
The cloudier part of the year begins around October 6 and lasts for 8.9 months, ending around July 3. On February 8, the cloudiest day of the year, the sky is overcast or mostly cloudy 50% of the time, and clear, mostly clear, or partly cloudy 50% of the time.
Cloud Cover Categories
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. The chance of wet days at Foz do Iguaçu / Cataratas International Airport varies throughout the year.
The wetter season lasts 7.3 months, from September 18 to April 28, with a greater than 38% chance of a given day being a wet day. The chance of a wet day peaks at 50% on February 8.
The drier season lasts 4.7 months, from April 28 to September 18. The smallest chance of a wet day is 26% on August 26.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 50% on February 8.
Daily Chance of Precipitation
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. Foz do Iguaçu / Cataratas International Airport experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year at Foz do Iguaçu / Cataratas International Airport. The most rain falls during the 31 days centered around October 17, with an average total accumulation of 7.6 inches.
The least rain falls around August 8, with an average total accumulation of 3.4 inches.
Average Monthly Rainfall
The length of the day at Foz do Iguaçu / Cataratas International Airport varies over the course of the year. In 2021, the shortest day is June 21, with 10 hours, 32 minutes of daylight; the longest day is December 21, with 13 hours, 44 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:38 AM on December 1, and the latest sunrise is 1 hour, 46 minutes later at 7:24 AM on July 3. The earliest sunset is at 5:54 PM on June 8, and the latest sunset is 1 hour, 40 minutes later at 7:34 PM on January 12.
Daylight saving time (DST) is not observed at Foz do Iguaçu / Cataratas International Airport during 2021.
Sunrise & Sunset with Twilight
The figure below presents a compact representation of key lunar data for 2021. 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.
Moon Rise, Set & 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.
Foz do Iguaçu / Cataratas International Airport experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 7.2 months, from October 4 to May 11, during which time the comfort level is muggy, oppressive, or miserable at least 24% of the time. The muggiest day of the year is February 9, with muggy conditions 83% of the time.
The least muggy day of the year is July 22, with muggy conditions 4% of the time.
Humidity Comfort Levels
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 at Foz do Iguaçu / Cataratas International Airport does not vary significantly over the course of the year, remaining within 0.4 miles per hour of 3.7 miles per hour throughout.
Average Wind Speed
The predominant average hourly wind direction at Foz do Iguaçu / Cataratas International Airport varies throughout the year.
The wind is most often from the east for 9.5 months, from February 19 to December 5, with a peak percentage of 41% on August 9. The wind is most often from the north for 2.5 months, from December 5 to February 19, with a peak percentage of 35% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is at Foz do Iguaçu / Cataratas International Airport 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 Foz do Iguaçu / Cataratas International Airport for general outdoor tourist activities are from late March to early June and from late July to early November, with a peak score in the first week of May.
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 Foz do Iguaçu / Cataratas International Airport for hot-weather activities is from early November to mid April, with a peak score in the third week of March.
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).
While it does not do so every year, freezing temperatures are seen at Foz do Iguaçu / Cataratas International Airport over some winters. The day least likely to be in the growing season is July 16, with a 73% chance.
Time Spent in Various Temperature Bands and the Growing Season
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.
Based on growing degree days alone, the first spring blooms at Foz do Iguaçu / Cataratas International Airport should appear around July 8, only rarely appearing before July 6 or after July 11.
Growing Degree Days
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 29 to February 10, with an average daily incident shortwave energy per square meter above 6.4 kWh. The brightest day of the year is December 12, with an average of 7.1 kWh.
The darker period of the year lasts for 2.8 months, from May 12 to August 5, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest day of the year is June 25, with an average of 3.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Foz do Iguaçu / Cataratas International Airport are -25.596 deg latitude, -54.487 deg longitude, and 768 ft elevation.
The topography within 2 miles of Foz do Iguaçu / Cataratas International Airport contains significant variations in elevation, with a maximum elevation change of 656 feet and an average elevation above sea level of 711 feet. Within 10 miles contains significant variations in elevation (843 feet). Within 50 miles contains very significant variations in elevation (2,005 feet).
The area within 2 miles of Foz do Iguaçu / Cataratas International Airport is covered by trees (41%), cropland (35%), shrubs (14%), and grassland (10%), within 10 miles by trees (55%) and cropland (19%), and within 50 miles by trees (47%) and cropland (24%).
This report illustrates the typical weather at Foz do Iguaçu / Cataratas International Airport, 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
Foz do Iguaçu / Cataratas International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
In this case, the only station close and reliable enough to use as a fallback is Cataratas del Iguazú International Airport.
All 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 © 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.