Puerto Iguazú has a Humid Subtropical climate (Cfa according to Köppen climate classification). Temperatures are warm in winter and hot in summer. There is no dry season and rainfall is abundant with every month receiving over 100 mm (3.9 inches) of rain and the wettest month, November, receiving over 200 mm (7.9 inches) of rain on average. Precipitation falls mostly during convectivestorms. Due to abundant rainfall, rainforests surrounds Puerto Iguazú.
The hot season lasts for up to 6 months or more, with temperatures reaching between 30°C (86F) and 35°C (95F) on most days, and dropping to 18°C (64F) to 24°C (75F) at night. Thunderstorms with heavy rains bring relief when the heat becomes too intense. The cool season runs from late April to mid September, with daily highs reaching an average of 21°C (70F) and a low of 11°C (52F) in June. These averages are reached through an alternating weather pattern, with several days with northerly winds and temperatures of around 28°C (82F) or higher and warm nights over 15°C (59F) giving way, in a very sudden manner, to cool, rainy weather and temperatures between 10°C and 15°C (50F to 59F) for a few days, then to dry, sunny weather and colder nights (around 5°C, or 41F, and sometimes much lower) and pleasant days in the 15°C to 20°C (59F to 68F) range, and a gradual increase in temperatures as winds rotate to the north again. Frost is rare but does occur on some winters, and temperatures within a few degrees of freezing occur every winter. The record low is -4.9°C (23.1F), a surprisingly low value given the latitude, the vegetation and the low elevation of the area.
Temperatures above 40°C (104°F) have been recorded in the summer
