Climate - Puerto Iguazu (Argentina)

The climate of Puerto Iguazú is subtropical, with very mild winters and very hot summers.
The rains are abundant and there is no dry season, however, they are a little more abundant in spring and autumn, and a little less in the austral winter. In fact, from June to August there are long periods without rain, of a week or two, although it depends on the years.
Although the winter is generally mild, it can sometimes get cold, especially at night. In July 1975 the temperature dropped to -4 °C (25 °F). In July 2016 there was a day with a maximum of 10 °C (50 °F).
In summer, from December to March, it can get very hot, and the temperature can reach 38/39 °C (100/102 °F). In January 2022 it reached 40.6 °C (105.1 °F), and the average high was 36.2 °C (97.1 °F).
The city is located in the extreme north-east of Argentina, at 170 meters (560 feet) above sea level, in the province of Misiones, on the border with Paraguay and Brazil.



Nearby are the famous Iguazu Falls. They are the largest waterfalls in the world (although not the ones with the greatest flow), and are formed by the Iguazú River, which originates in Brazil, then heads southwest and marks the border between Brazil and Argentina. Hence, the falls can be observed from both the Argentinian and the Brazilian sides.
Further on, about 20 km (12 mi) west of the falls, near the three twin cities, Ciudad del Este (Paraguay), Foz do Iguaçu (Brazil) and Puerto Iguazú (Argentina), the Iguazú flows into the Paraná River.
The highest flow of the falls is recorded in what is the wettest period in the Iguazú River basin, that is, from November to March, while the lowest flow is recorded from August to October.

Best Time

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The best time to visit Puerto Iguazú is from June to August, being the coolest and driest of the year. Sometimes it can also get cold, so it's better to bring some warm clothes.
Iguazu Falls are most crowded with visitors in January and February, the period of summer holidays in South America, during Easter week, and during the winter holidays (usually in the second half of July).
In the hottest period, from December to February, there is sultry heat and many mosquitoes, and the rains are more abundant, but the days are a little longer and there is a good number of hours of sunshine. In addition, since it is hot, there is no problem if you get wet from rain or spray. Plus, the falls are more spectacular. However, sometimes the rains can create problems and make some trails, as well as the island of San Martín, inaccessible. In addition, it can sometimes get very hot, even 38/40 °C (100/104 °F).
You can then choose the month of April, in which conditions are intermediate between winter and summer, avoiding the week of Easter, and bearing in mind that the weather depends on the years.

Puerto Iguazu - Climate data

In Puerto Iguazu, the average temperature of the coldest month (July) is of 17.1 °C (62.7 °F), that of the warmest month (January) is of 26.7 °C (80.1 °F). Here are the average temperatures.
In Puerto Iguazu, precipitation amounts to 1920 millimeters (75.6 inches) per year: it is therefore abundant. It ranges from 115 mm (4.5 in) in the driest month (March) to 210 mm (8.3 in) in the wettest one (November). Here is the average precipitation.
In Puerto Iguazu, there are on average around 1870 sunshine hours per year. Here are the average hours of sunshine per day.

Puerto Iguazu - Weather by month

Based on the period 1991-2020

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In January, the hottest month of the year, the weather in Puerto Iguazu is usually warm to hot and muggy. The average temperature is of 26.7 °C (80 °F), with a minimum of 20.7 °C (69.2 °F) and a maximum of 32.8 °C (91 °F).
On the coldest nights of the month, the temperature usually drops to around 17 °C (62.5 °F). However, it dropped to 13.5 °C (56.3 °F) in January 1992.
On the warmest days of the month, the temperature usually reaches around 36 °C (96.5 °F). However, it reached 38.5 °C (101.3 °F) in January 2006.
Precipitation amounts to 175 mm (6.9 in), distributed over 11 days.
The day lasts on average 13 hours and 30 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 7 kph (5 mph).

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In February, the weather in Puerto Iguazu is usually warm to hot and muggy. The average temperature is of 26.3 °C (79 °F), with a minimum of 20.4 °C (68.6 °F) and a maximum of 32.3 °C (90.1 °F).
On the coldest nights of the month, the temperature usually drops to around 16 °C (61 °F). However, it dropped to 11 °C (51.8 °F) in February 1991.
On the warmest days of the month, the temperature usually reaches around 36 °C (96.5 °F). However, it reached 39 °C (102.2 °F) in February 1997.
Precipitation amounts to 175 mm (6.9 in), distributed over 12 days.
The day lasts on average 12 hours and 55 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 7 kph (4 mph).

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In March, the weather in Puerto Iguazu is usually warm to hot and muggy. The average temperature is of 25.4 °C (78 °F), with a minimum of 19.3 °C (66.8 °F) and a maximum of 31.4 °C (88.5 °F).
On the coldest nights, the temperature usually drops to around 14.5 °C (57.5 °F). However, it dropped to 8 °C (46.4 °F) in March 2012.
On the warmest days, the temperature usually reaches around 35 °C (95 °F). However, it reached 39 °C (102.2 °F) in March 1997.
Precipitation amounts to 115 mm (4.5 in), distributed over 8 days.
The day lasts on average 12 hours and 10 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).

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In April, the weather in Puerto Iguazu is usually warm to hot and muggy. The average temperature is of 22.8 °C (73 °F), with a minimum of 16.8 °C (62.3 °F) and a maximum of 28.7 °C (83.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 9 °C (48.5 °F). However, it dropped to 3 °C (37.4 °F) in April 1999.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 33 °C (91.5 °F). However, it reached 35.1 °C (95.2 °F) in April 2005.
Precipitation amounts to 200 mm (7.9 in), distributed over 10 days.
The day lasts on average 11 hours and 25 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 7 kph (4 mph).

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In May, the weather in Puerto Iguazu is usually warm. The average temperature is of 18.8 °C (66 °F), with a minimum of 13.1 °C (55.6 °F) and a maximum of 24.5 °C (76.1 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 5.5 °C (42 °F). However, it dropped to 0 °C (32 °F) in May 2007.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 30 °C (86 °F). However, it reached 32.7 °C (90.9 °F) in May 2018.
Precipitation amounts to 185 mm (7.3 in), distributed over 10 days.
The day lasts on average 10 hours and 50 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 41% of the time.
The average humidity is 86%. Hence, the air is normally humid.
The average wind speed is 7 kph (4 mph).

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In June, the weather in Puerto Iguazu is usually very mild. The average temperature is of 17.6 °C (64 °F), with a minimum of 11.9 °C (53.4 °F) and a maximum of 23.3 °C (73.9 °F).
On the coldest nights, the temperature usually drops to around 3 °C (37.5 °F). However, it dropped to -1 °C (30.2 °F) in June 1994.
On the warmest days, the temperature usually reaches around 28.5 °C (83.5 °F). However, it reached 31 °C (87.8 °F) in June 2020.
Precipitation amounts to 155 mm (6.1 in), distributed over 9 days.
The day lasts on average 10 hours and 35 minutes. June 21, the winter solstice, is the shortest day of the year in the Southern Hemisphere.
There are on average 4 hours of sunshine per day. So, the sun shines 36% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 7 kph (5 mph).

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In July, the coldest month of the year, the weather in Puerto Iguazu is usually very mild. The average temperature is of 17.1 °C (63 °F), with a minimum of 10.7 °C (51.2 °F) and a maximum of 23.5 °C (74.2 °F).
On the coldest nights of the month, the temperature usually drops to around 1.5 °C (34.5 °F). However, it dropped to -2 °C (28.4 °F) in July 2009.
On the warmest days of the month, the temperature usually reaches around 29.5 °C (85 °F). However, it reached 32 °C (89.6 °F) in July 2018.
Precipitation amounts to 130 mm (5.1 in), distributed over 8 days.
The day lasts on average 10 hours and 40 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 39% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is 8 kph (5 mph).

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In August, the weather in Puerto Iguazu is usually warm. However, there are remarkable differences between night and day. The average temperature is of 19.2 °C (67 °F), with a minimum of 12.2 °C (53.9 °F) and a maximum of 26.3 °C (79.4 °F).
On the coldest nights of the month, the temperature usually drops to around 3 °C (37 °F). However, it dropped to -2 °C (28.4 °F) in August 1991.
On the warmest days of the month, the temperature usually reaches around 33 °C (91.5 °F). However, it reached 35.1 °C (95.2 °F) in August 1995.
Precipitation amounts to 125 mm (4.9 in), distributed over 8 days.
The day lasts on average 11 hours and 20 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 38% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 9 kph (5 mph).

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In September, the weather in Puerto Iguazu is usually warm. However, there are remarkable differences between night and day. The average temperature is of 21.1 °C (70 °F), with a minimum of 14.2 °C (57.6 °F) and a maximum of 28 °C (82.4 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 5.5 °C (42.5 °F). However, it dropped to 1.2 °C (34.2 °F) in September 2003.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 35.5 °C (95.5 °F). However, it reached 40 °C (104 °F) in September 2020.
Precipitation amounts to 135 mm (5.3 in), distributed over 9 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 9 kph (6 mph).

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In October, the weather in Puerto Iguazu is usually warm to hot and muggy. The average temperature is of 23.4 °C (74 °F), with a minimum of 17 °C (62.6 °F) and a maximum of 29.9 °C (85.8 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 10.5 °C (51 °F). However, it dropped to 6 °C (42.8 °F) in October 1999.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 35.5 °C (96 °F). However, it reached 40.1 °C (104.2 °F) in October 2020.
Precipitation amounts to 180 mm (7.1 in), distributed over 10 days.
The day lasts on average 12 hours and 40 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 9 kph (5 mph).

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In November, the weather in Puerto Iguazu is usually warm to hot and muggy. However, there are remarkable differences between night and day. The average temperature is of 24.5 °C (76 °F), with a minimum of 17.8 °C (64.1 °F) and a maximum of 31.2 °C (88.2 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 12 °C (54 °F). However, it dropped to 7 °C (44.6 °F) in November 1992.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 36 °C (96.5 °F). However, it reached 39.9 °C (103.8 °F) in November 1995.
Precipitation amounts to 210 mm (8.3 in), distributed over 11 days.
The day lasts on average 13 hours and 25 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 8 kph (5 mph).

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In December, the weather in Puerto Iguazu is usually warm to hot and muggy. The average temperature is of 26.0 °C (79 °F), with a minimum of 19.8 °C (67.6 °F) and a maximum of 32.3 °C (90.2 °F).
On the coldest nights of the month, the temperature usually drops to around 14.5 °C (58.5 °F). However, it dropped to 7.8 °C (46 °F) in December 2010.
On the warmest days of the month, the temperature usually reaches around 36 °C (97 °F). However, it reached 38.7 °C (101.7 °F) in December 1995.
Precipitation amounts to 135 mm (5.3 in), distributed over 10 days.
The day lasts on average 13 hours and 40 minutes. December 21, the summer solstice, is the longest day of the year in the Southern Hemisphere.
There are on average 6.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 8 kph (5 mph).