DISCUSSION: With the 2016 Summer Olympics right around the corner, here is what we can expect for the month of August in Rio de Janeiro, Brazil. Based off of Rio’s climatological past, August is often the coolest and driest month of the year for the city with an average temperature of 72°F and average precipitation of about 2 inches of rainfall. The capital of Brazil is classified as having a tropical savanna climate that closely borders a tropical monsoon climate according to the Köppen climate classification. Rio receives the majority of its rainfall during the summer months, which in the Southern hemisphere runs from December to March. August, therefore is winter in Brazil, but winters in Brazil are not cold by any means and no snow has ever been recorded in the capital since modern records have begun. Powerful cold fronts from Antarctica can often make their way through the city, but they moderate very quickly as the city is located right off of the Atlantic Ocean with water temperatures that sit at an average of 72°F as well. Air temperatures can vary wildly throughout the entire year in Rio, approaching 100°F several times a year, this combined with awfully high humidity levels can lead to heat index values approaching dangerous levels over 110°F. Other times of the year temperatures can dip down into the upper 30’s, this mainly occurs during the winter when the aforementioned polar fronts make their way through the region. The city receives over 42 inches of rainfall a year, with the bulk of that occurring during the summer months, when nearly half of the total rainfall falls between December and March alone. During this time period rainfall occurs quite often from extra-tropical cyclones off the adjacent Atlantic.
For the month of August the average high temperature in Rio reaches 79°F, meanwhile the average low temperature is right around 66°F. The city usually sees around 7 days of rainfall for the month of August, which means with the 2016 Summer Olympics lasting from August 5 to August 21 we can generally expect about 2 days of rainfall during this time period, in a typical year. Looking at the latest weather models, forecasters are predicting a terrific start to the 2016 Summer Olympics with temperatures right around average for this time of year with an abundance of sunshine! To learn more about other high-impact weather events from across Central and South America, be sure to click here!